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Претрага радова објављених у периоду (2019-2022):
61.
Dobrota, A. S.; Vlahović, J.; Skorodumova, N. V.; Pašti, I. A.
In: Materials Today Communications, 31 , 2022.
@article{Dobrota2022,
title = {First-principles analysis of aluminium interaction with nitrogen-doped graphene nanoribbons – from adatom bonding to various potential applications},
author = {A. S. Dobrota and J. Vlahović and N. V. Skorodumova and I. A. Pašti},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127560615&doi=10.1016%2fj.mtcomm.2022.103388&partnerID=40&md5=b21cd383246be145b0b0d5e14911a46c},
doi = {10.1016/j.mtcomm.2022.103388},
year = {2022},
date = {2022-01-01},
journal = {Materials Today Communications},
volume = {31},
abstract = {Enhancing aluminium interaction with graphene-based materials is of crucial importance for the development of Al-storage materials and novel functional materials via atomically precise doping. Here, DFT calculations are employed to investigate Al interactions with non-doped and N-doped graphene nanoribbons (GNRs) and address the impact of the edge sites and N-containing defects on the material's reactivity towards Al. The presence of edges does not influence the energetics of Al adsorption significantly (compared to pristine graphene sheet). On the other hand, N-doping of graphene nanoribbons is found to affect the adsorption energy of Al to an extent that strongly depends on the type of N-containing defect. The introduction of edge −NO group and doping with in-plane pyridinic N result in Al adsorption nearly twice as strong as on pristine graphene. Moreover, double n-type doping via N and Al significantly alters the electronic structure of Al,N-containing GNRs. Our results suggest that selectively doped GNRs with pyridinic N can have enhanced Al-storage capacity and could be potentially used for selective Al electrosorption and removal. On the other hand, Al,N-containing GNRs with pyridinic N could also be used in resistive sensors for mechanical deformation. Namely, strain along the longitudinal axis of these dual doped GNRs does not affect the binding of Al but tunes the bandgap and causes more than 700-fold change in the conductivity. Thus, careful defect engineering and selective doping of GNRs with N (and Al) could lead to novel multifunctional materials with exceptional properties.[Formula presented] © 2022 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Enhancing aluminium interaction with graphene-based materials is of crucial importance for the development of Al-storage materials and novel functional materials via atomically precise doping. Here, DFT calculations are employed to investigate Al interactions with non-doped and N-doped graphene nanoribbons (GNRs) and address the impact of the edge sites and N-containing defects on the material's reactivity towards Al. The presence of edges does not influence the energetics of Al adsorption significantly (compared to pristine graphene sheet). On the other hand, N-doping of graphene nanoribbons is found to affect the adsorption energy of Al to an extent that strongly depends on the type of N-containing defect. The introduction of edge −NO group and doping with in-plane pyridinic N result in Al adsorption nearly twice as strong as on pristine graphene. Moreover, double n-type doping via N and Al significantly alters the electronic structure of Al,N-containing GNRs. Our results suggest that selectively doped GNRs with pyridinic N can have enhanced Al-storage capacity and could be potentially used for selective Al electrosorption and removal. On the other hand, Al,N-containing GNRs with pyridinic N could also be used in resistive sensors for mechanical deformation. Namely, strain along the longitudinal axis of these dual doped GNRs does not affect the binding of Al but tunes the bandgap and causes more than 700-fold change in the conductivity. Thus, careful defect engineering and selective doping of GNRs with N (and Al) could lead to novel multifunctional materials with exceptional properties.[Formula presented] © 2022 Elsevier Ltd
62.
Petrusic, I.; Valle, G.; Dakovic, M.; Damjanovic, D.; Bumbasirevic, M.; Raspopovic, S.
Plastic changes in the brain after a neuro-prosthetic leg use Journal Article
In: Clinical Neurophysiology, 138 , pp. 186-188, 2022.
@article{Petrusic2022186,
title = {Plastic changes in the brain after a neuro-prosthetic leg use},
author = {I. Petrusic and G. Valle and M. Dakovic and D. Damjanovic and M. Bumbasirevic and S. Raspopovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85128716671&doi=10.1016%2fj.clinph.2022.04.001&partnerID=40&md5=db9075472a77bf8a95867a530721ca40},
doi = {10.1016/j.clinph.2022.04.001},
year = {2022},
date = {2022-01-01},
journal = {Clinical Neurophysiology},
volume = {138},
pages = {186-188},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
63.
Popović, A.; Manojlović, V.; Adnadjević, B.; Petrović, J.; Kamberović, Ž.; Ranitović, M.
Recovery of Rare-Earth Elements from Printed Circuit Boards by Vacuum Pyrolysis and Multiple Electrostatic Separation Journal Article
In: Processes, 10 (6), 2022.
@article{Popović2022,
title = {Recovery of Rare-Earth Elements from Printed Circuit Boards by Vacuum Pyrolysis and Multiple Electrostatic Separation},
author = {A. Popović and V. Manojlović and B. Adnadjević and J. Petrović and Ž. Kamberović and M. Ranitović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132195518&doi=10.3390%2fpr10061152&partnerID=40&md5=fe72c6658cb2927c7ddaf7e011cd1913},
doi = {10.3390/pr10061152},
year = {2022},
date = {2022-01-01},
journal = {Processes},
volume = {10},
number = {6},
abstract = {The influence of the multi-stage electrostatic separation (ESS) of mechanically treated and magnetically separated waste electronic material and the pyrolysis of the selected ESS fraction on the distribution of metal elements (MEs), elements contained in refractory oxides (EROs), bromine (Br), and rare-earth elements (REEs) contained in waste electronic material was studied. The concentration of MEs, Br, and EROs in the tested samples was determined by X-ray fluorescence analysis, and the concentration of REEs and uranium was determined by inductively coupled plasma mass spectrometry (ICP-MS). The analysis of the distribution of elements during the multi-stage ESS showed that MEs were predominantly distributed in the conductive fraction and Br, EROs, and REEs were distributed in the nonconductive fraction. The nonconductive fraction (NC2) of the two-stage ESS was subjected to a low-temperature vacuum pyrolysis (T = 550◦C},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The influence of the multi-stage electrostatic separation (ESS) of mechanically treated and magnetically separated waste electronic material and the pyrolysis of the selected ESS fraction on the distribution of metal elements (MEs), elements contained in refractory oxides (EROs), bromine (Br), and rare-earth elements (REEs) contained in waste electronic material was studied. The concentration of MEs, Br, and EROs in the tested samples was determined by X-ray fluorescence analysis, and the concentration of REEs and uranium was determined by inductively coupled plasma mass spectrometry (ICP-MS). The analysis of the distribution of elements during the multi-stage ESS showed that MEs were predominantly distributed in the conductive fraction and Br, EROs, and REEs were distributed in the nonconductive fraction. The nonconductive fraction (NC2) of the two-stage ESS was subjected to a low-temperature vacuum pyrolysis (T = 550◦C
64.
Vesković, A.; Nakarada, Ð.; Vasiljević, O.; Dobrov, A.; Spengler, G.; Enyedy, É. A.; Arion, V. B.; Bijelić, A. P.
The Release of a Highly Cytotoxic Paullone Bearing a TEMPO Free Radical from the HSA Hydrogel: An EPR Spectroscopic Characterization Journal Article
In: Pharmaceutics, 14 (6), 2022.
@article{Vesković2022,
title = {The Release of a Highly Cytotoxic Paullone Bearing a TEMPO Free Radical from the HSA Hydrogel: An EPR Spectroscopic Characterization},
author = {A. Vesković and Ð. Nakarada and O. Vasiljević and A. Dobrov and G. Spengler and É. A. Enyedy and V. B. Arion and A. P. Bijelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132295538&doi=10.3390%2fpharmaceutics14061174&partnerID=40&md5=69d534c18091333f09a4537603150432},
doi = {10.3390/pharmaceutics14061174},
year = {2022},
date = {2022-01-01},
journal = {Pharmaceutics},
volume = {14},
number = {6},
abstract = {This study shows the potential of a thermally induced human serum albumin (HSA) hydrogel to serve as a drug depot for sustained release of a highly cytotoxic modified paullone ligand bearing a TEMPO free radical (HL). The binding of HL to HSA was studied by electron paramagnetic resonance (EPR) spectroscopy and imaging. The EPR protocol was also implemented for the study of matrix degradation, and ligand diffusion rate, in two additional spin-labeled hydrogels, containing 5-doxylstearate and 3-carbamoyl-proxyl. The results showed that the hydrogel is an efficient HL reservoir as it retained 60% of the ligand during 11 days of dialysis in physiological saline. Furthermore, upon incubation with Colo 205 human colon adenocarcinoma cells for 3 days, the HL/HSA hydrogel did not exhibit cytotoxic activity, demonstrating that it is also an efficient ligand depot in the presence of living cells. It was observed that the percentage of HL release is independent of its initial concentration in the hydrogel, suggesting that HSA possesses a specific binding site for the ligand, most likely Sudlow site 2, as predicted by molecular docking. The intrinsic property of albumin to bind and transport various substances, including hydrophobic drugs, may be fine-tuned by appropriate physical/chemical hydrogel preparation procedures, providing optimal drug delivery. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study shows the potential of a thermally induced human serum albumin (HSA) hydrogel to serve as a drug depot for sustained release of a highly cytotoxic modified paullone ligand bearing a TEMPO free radical (HL). The binding of HL to HSA was studied by electron paramagnetic resonance (EPR) spectroscopy and imaging. The EPR protocol was also implemented for the study of matrix degradation, and ligand diffusion rate, in two additional spin-labeled hydrogels, containing 5-doxylstearate and 3-carbamoyl-proxyl. The results showed that the hydrogel is an efficient HL reservoir as it retained 60% of the ligand during 11 days of dialysis in physiological saline. Furthermore, upon incubation with Colo 205 human colon adenocarcinoma cells for 3 days, the HL/HSA hydrogel did not exhibit cytotoxic activity, demonstrating that it is also an efficient ligand depot in the presence of living cells. It was observed that the percentage of HL release is independent of its initial concentration in the hydrogel, suggesting that HSA possesses a specific binding site for the ligand, most likely Sudlow site 2, as predicted by molecular docking. The intrinsic property of albumin to bind and transport various substances, including hydrophobic drugs, may be fine-tuned by appropriate physical/chemical hydrogel preparation procedures, providing optimal drug delivery. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
65.
Mladenović, D.; Daş, E.; Santos, D. M. F.; Yurtcan, A. B.; Miljanić,; Šljukić, B.
Boosting oxygen electrode kinetics by addition of cost-effective transition metals (Ni, Fe, Cu) to platinum on graphene nanoplatelets Journal Article
In: Journal of Alloys and Compounds, 905 , 2022.
@article{Mladenović2022,
title = {Boosting oxygen electrode kinetics by addition of cost-effective transition metals (Ni, Fe, Cu) to platinum on graphene nanoplatelets},
author = {D. Mladenović and E. Daş and D. M. F. Santos and A. B. Yurtcan and Miljanić and B. Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85126115770&doi=10.1016%2fj.jallcom.2022.164156&partnerID=40&md5=6339fa648d3d538c4d5e92efdc63ce19},
doi = {10.1016/j.jallcom.2022.164156},
year = {2022},
date = {2022-01-01},
journal = {Journal of Alloys and Compounds},
volume = {905},
abstract = {Pt and Pt-M (M = Ni, Fe, Cu) nanoparticles supported on graphene nanoplatelets (GNPs) were synthesized by simultaneous supercritical carbon dioxide deposition method. Morphology analysis by TEM revealed the formation of metal nanoparticles of 2–3 nm size uniformly distributed over GNPs, while XPS was used to determine their oxidation states. Four materials were tested as electrocatalysts for ORR and OER in unitized regenerative fuel cells and rechargeable metal-air batteries. PtFe/GNPs exhibited favorable ORR kinetics in terms of the highest diffusion-limited current density, the lowest Tafel slope, and a high number of exchanged electrons (n = 3.66), which might be attributed to its high double-layer capacitance and, thus, high electrochemically active surface area. Furthermore, this material performance was comparable to that of commercial Pt/C electrocatalyst containing double the amount of Pt. The same material showed the best performance toward OER as evidenced by the highest current density, the lowest value of exchange current density, and overpotential to reach a current density of 10 mA cm-2, as well as the lowest Tafel slope. © 2022 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pt and Pt-M (M = Ni, Fe, Cu) nanoparticles supported on graphene nanoplatelets (GNPs) were synthesized by simultaneous supercritical carbon dioxide deposition method. Morphology analysis by TEM revealed the formation of metal nanoparticles of 2–3 nm size uniformly distributed over GNPs, while XPS was used to determine their oxidation states. Four materials were tested as electrocatalysts for ORR and OER in unitized regenerative fuel cells and rechargeable metal-air batteries. PtFe/GNPs exhibited favorable ORR kinetics in terms of the highest diffusion-limited current density, the lowest Tafel slope, and a high number of exchanged electrons (n = 3.66), which might be attributed to its high double-layer capacitance and, thus, high electrochemically active surface area. Furthermore, this material performance was comparable to that of commercial Pt/C electrocatalyst containing double the amount of Pt. The same material showed the best performance toward OER as evidenced by the highest current density, the lowest value of exchange current density, and overpotential to reach a current density of 10 mA cm-2, as well as the lowest Tafel slope. © 2022 Elsevier B.V.
66.
Milakin, K. A.; Gupta, S.; Pop-Georgievski, O.; Morávková, Z.; Acharya, U.; Taboubi, O.; Breitenbach, S.; Gavrilov, N.; Unterweger, C.; Bober, P.
Macroporous nitrogen-containing carbon for electrochemical capacitors Journal Article
In: Electrochimica Acta, 418 , 2022.
@article{Milakin2022,
title = {Macroporous nitrogen-containing carbon for electrochemical capacitors},
author = {K. A. Milakin and S. Gupta and O. Pop-Georgievski and Z. Morávková and U. Acharya and O. Taboubi and S. Breitenbach and N. Gavrilov and C. Unterweger and P. Bober},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85128482422&doi=10.1016%2fj.electacta.2022.140370&partnerID=40&md5=119ed5a44924c072ce885ad2608737e7},
doi = {10.1016/j.electacta.2022.140370},
year = {2022},
date = {2022-01-01},
journal = {Electrochimica Acta},
volume = {418},
abstract = {Polypyrrole-gelatin aerogels were synthesized by a one-step cryopolymerization approach and carbonized at various temperatures (100–700 °C). The mechanical integrity and macroporous morphology (pore size 4–16 µm) of materials carbonized at all studied temperatures were preserved after carbonization. Raman and X-ray photoelectron spectroscopies confirmed the aerogel conversion to carbon with gradually enhanced structural order at higher temperatures (300–600 °C). Change of the material conductivity with carbonization temperature follows the evolution of its molecular structure, reaching 2 × 10–5 S cm–1 for a fully carbonized aerogel (700 °C). Specific surface area and total pore volume values for the carbonized material were ⁓one order of magnitude higher (441.7 m2 g–1 and 0.21 cm3 g–1 at 600 °C, respectively) compared to the ones of the precursor. Cyclic voltammetry measurements showed that gravimetric capacitance of the products increased at higher carbonization temperatures up to 209 F g–1 (700 °C) and was stable for at least 1000 cycles. Galvanostatic charge-discharge method showed the highest capacitance 273 F g–1 (1 M HCl). The prepared nitrogen-containing carbon materials can be potentially used for supercapacitor applications. © 2022 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Polypyrrole-gelatin aerogels were synthesized by a one-step cryopolymerization approach and carbonized at various temperatures (100–700 °C). The mechanical integrity and macroporous morphology (pore size 4–16 µm) of materials carbonized at all studied temperatures were preserved after carbonization. Raman and X-ray photoelectron spectroscopies confirmed the aerogel conversion to carbon with gradually enhanced structural order at higher temperatures (300–600 °C). Change of the material conductivity with carbonization temperature follows the evolution of its molecular structure, reaching 2 × 10–5 S cm–1 for a fully carbonized aerogel (700 °C). Specific surface area and total pore volume values for the carbonized material were ⁓one order of magnitude higher (441.7 m2 g–1 and 0.21 cm3 g–1 at 600 °C, respectively) compared to the ones of the precursor. Cyclic voltammetry measurements showed that gravimetric capacitance of the products increased at higher carbonization temperatures up to 209 F g–1 (700 °C) and was stable for at least 1000 cycles. Galvanostatic charge-discharge method showed the highest capacitance 273 F g–1 (1 M HCl). The prepared nitrogen-containing carbon materials can be potentially used for supercapacitor applications. © 2022 Elsevier Ltd
67.
Bubanja, I. N.; Stanisavljev, D.
Continuous measurements of gaseous oxygen production in Bray-Liebhafsky oscillatory reaction and its correlation with the reaction mechanism Journal Article
In: Inorganic Chemistry Communications, 141 , 2022.
@article{Bubanja2022,
title = {Continuous measurements of gaseous oxygen production in Bray-Liebhafsky oscillatory reaction and its correlation with the reaction mechanism},
author = {I. N. Bubanja and D. Stanisavljev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85129715483&doi=10.1016%2fj.inoche.2022.109528&partnerID=40&md5=f884bf0520171c778fa3a472a5e34d70},
doi = {10.1016/j.inoche.2022.109528},
year = {2022},
date = {2022-01-01},
journal = {Inorganic Chemistry Communications},
volume = {141},
abstract = {Upgraded design of the experimental setup for monitoring Bray-Liebhafsky (BL) oscillatory reaction dynamics allowed simultaneous recording of platinum electrode potential and gaseous pressure changes over time. Experiments were performed at two stirring rates (600 rpm and 1200 rpm) in five replicates. Evolved gas at two mixing rates is correlated with reaction induction period, number of oscillations, period between oscillations, oscillation amplitude and number of produced oxygen moles per oscillation. Obtained trends indicate that the amount of formed gas facilitates initiation of iodine oxidation. Results are in agreement with previous findings which point to the importance of heterogeneous effects in reaction of iodine oxidation. © 2022 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Upgraded design of the experimental setup for monitoring Bray-Liebhafsky (BL) oscillatory reaction dynamics allowed simultaneous recording of platinum electrode potential and gaseous pressure changes over time. Experiments were performed at two stirring rates (600 rpm and 1200 rpm) in five replicates. Evolved gas at two mixing rates is correlated with reaction induction period, number of oscillations, period between oscillations, oscillation amplitude and number of produced oxygen moles per oscillation. Obtained trends indicate that the amount of formed gas facilitates initiation of iodine oxidation. Results are in agreement with previous findings which point to the importance of heterogeneous effects in reaction of iodine oxidation. © 2022 Elsevier B.V.
68.
Milikić, J.; Nikolić, N.; Santos, D. M. F.; Macciò, D.; Saccone, A.; Alsaiari, M.; Jalalah, M.; Faisal, M.; Harraz, F. A.; Li, Y.; Nassr, A. B.; Pašti, I.; Šljukić, B.
Platinum–Dysprosium Alloys as Oxygen Electrodes in Alkaline Media: An Experimental and Theoretical Study Journal Article
In: Nanomaterials, 12 (14), 2022.
@article{Milikić2022d,
title = {Platinum–Dysprosium Alloys as Oxygen Electrodes in Alkaline Media: An Experimental and Theoretical Study},
author = {J. Milikić and N. Nikolić and D. M. F. Santos and D. Macciò and A. Saccone and M. Alsaiari and M. Jalalah and M. Faisal and F. A. Harraz and Y. Li and A. B. Nassr and I. Pašti and B. Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85133310202&doi=10.3390%2fnano12142318&partnerID=40&md5=9dbebb67a40be2265484695e6aab8c9a},
doi = {10.3390/nano12142318},
year = {2022},
date = {2022-01-01},
journal = {Nanomaterials},
volume = {12},
number = {14},
abstract = {Platinum–dysprosium (Pt–Dy) alloys prepared by the arc melting technique are assessed as potential electrodes for the oxygen reduction reaction (ORR) using voltammetry and chronoamperometry in alkaline media. A relatively small change (10 at.%) in the alloy composition brought a notable difference in the alloys’ performance for the ORR. Pt40Dy60 electrode, i.e., the electrode with a lower amount of Pt, was identified to have a higher activity towards ORR as evidenced by lower overpotential and higher current densities under identical experimental conditions. Furthermore, DFT calculations point out the unique single-atom-like coordination and electronic structure of Pt atoms in the Pt40Dy60 surface as responsible for enhanced ORR activity compared to the alloy with a higher Pt content. Additionally, Pt–Dy alloys showed activity in the oxygen evolution reaction (OER), with the OER current density lower than that of pure Pt. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Platinum–dysprosium (Pt–Dy) alloys prepared by the arc melting technique are assessed as potential electrodes for the oxygen reduction reaction (ORR) using voltammetry and chronoamperometry in alkaline media. A relatively small change (10 at.%) in the alloy composition brought a notable difference in the alloys’ performance for the ORR. Pt40Dy60 electrode, i.e., the electrode with a lower amount of Pt, was identified to have a higher activity towards ORR as evidenced by lower overpotential and higher current densities under identical experimental conditions. Furthermore, DFT calculations point out the unique single-atom-like coordination and electronic structure of Pt atoms in the Pt40Dy60 surface as responsible for enhanced ORR activity compared to the alloy with a higher Pt content. Additionally, Pt–Dy alloys showed activity in the oxygen evolution reaction (OER), with the OER current density lower than that of pure Pt. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
69.
Mijailović, N. R.; Vesic, K.; Arsenijevic, D.; Milojević-Rakić, M.; Borovcanin, M. M.
Galectin-3 Involvement in Cognitive Processes for New Therapeutic Considerations Journal Article
In: Frontiers in Cellular Neuroscience, 16 , 2022.
@article{Mijailović2022b,
title = {Galectin-3 Involvement in Cognitive Processes for New Therapeutic Considerations},
author = {N. R. Mijailović and K. Vesic and D. Arsenijevic and M. Milojević-Rakić and M. M. Borovcanin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85134301711&doi=10.3389%2ffncel.2022.923811&partnerID=40&md5=e79c4942a24a519f6004a951b9dd89bd},
doi = {10.3389/fncel.2022.923811},
year = {2022},
date = {2022-01-01},
journal = {Frontiers in Cellular Neuroscience},
volume = {16},
abstract = {Cognitive impairment may be a consequence of the normal aging process, but it may also be the hallmark of various neurodegenerative and psychiatric diseases. Early identification of individuals at particular risk for cognitive decline is critical, as it is imperative to maintain a cognitive reserve in these neuropsychiatric entities. In recent years, galectin-3 (Gal-3), a member of the galectin family, has received considerable attention with respect to aspects of neuroinflammation and neurodegeneration. The mechanisms behind the putative relationship between Gal-3 and cognitive impairment are not yet clear. Intrigued by this versatile molecule and its unique modular architecture, the latest data on this relationship are presented here. This mini-review summarizes recent findings on the mechanisms by which Gal-3 affects cognitive functioning in both animal and human models. Particular emphasis is placed on the role of Gal-3 in modulating the inflammatory response as a fine-tuner of microglia morphology and phenotype. A review of recent literature on the utility of Gal-3 as a biomarker is provided, and approaches to strategically exploit Gal-3 activities with therapeutic intentions in neuropsychiatric diseases are outlined. Copyright © 2022 Mijailović, Vesic, Arsenijevic, Milojević-Rakić and Borovcanin.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Cognitive impairment may be a consequence of the normal aging process, but it may also be the hallmark of various neurodegenerative and psychiatric diseases. Early identification of individuals at particular risk for cognitive decline is critical, as it is imperative to maintain a cognitive reserve in these neuropsychiatric entities. In recent years, galectin-3 (Gal-3), a member of the galectin family, has received considerable attention with respect to aspects of neuroinflammation and neurodegeneration. The mechanisms behind the putative relationship between Gal-3 and cognitive impairment are not yet clear. Intrigued by this versatile molecule and its unique modular architecture, the latest data on this relationship are presented here. This mini-review summarizes recent findings on the mechanisms by which Gal-3 affects cognitive functioning in both animal and human models. Particular emphasis is placed on the role of Gal-3 in modulating the inflammatory response as a fine-tuner of microglia morphology and phenotype. A review of recent literature on the utility of Gal-3 as a biomarker is provided, and approaches to strategically exploit Gal-3 activities with therapeutic intentions in neuropsychiatric diseases are outlined. Copyright © 2022 Mijailović, Vesic, Arsenijevic, Milojević-Rakić and Borovcanin.
70.
Adnaedvic, B. K.; Nikolic, I. R.; Milenkovic, S. A.; Jovanovic, J. D.
In: International Journal of Chemical Reactor Engineering, 20 (8), pp. 845-854, 2022.
@article{Adnaedvic2022845,
title = {The effect of operating parameters of hydrodynamic cavitation - Assisted alkaline catalyzed transesterification of sunflower oil with methanol on the degree of triglyceride conversion},
author = {B. K. Adnaedvic and I. R. Nikolic and S. A. Milenkovic and J. D. Jovanovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85122030769&doi=10.1515%2fijcre-2021-0131&partnerID=40&md5=35164f5ee60926d2c90b25779f3faa08},
doi = {10.1515/ijcre-2021-0131},
year = {2022},
date = {2022-01-01},
journal = {International Journal of Chemical Reactor Engineering},
volume = {20},
number = {8},
pages = {845-854},
abstract = {The effect of operating parameters such as reaction mixture inlet pressure p 1 (101.3-1013.2 kPa), methanol to oil molar ratio M 1 (3-12), the concentration of catalyst C c (0.0-1.0 wt%), temperature T (25-50 °C) and the number of passes of the reaction mixture through the venturi type hydrodynamic cavitation reactor n (1-12) on alkali-catalyzed transesterification of sunflower oil with methanol assisted by hydrodynamic cavitation (ACTC) on the value of the degree of triglyceride conversion (DTC) was investigated. ACTC was performed by the venturi-type hydrodynamic cavitation reactor (VCR) of our construction. It was found that the values of DTC increase with the increase in p 1, M 1, C c, and n, and decrease with the increase in T. Cavitation yield (CY) values were calculated. The ACTC was proved to be the simplest, fastest, and most highly energy-efficient current technology for the production of biodiesel. © 2021 Walter de Gruyter GmbH, Berlin/Boston.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effect of operating parameters such as reaction mixture inlet pressure p 1 (101.3-1013.2 kPa), methanol to oil molar ratio M 1 (3-12), the concentration of catalyst C c (0.0-1.0 wt%), temperature T (25-50 °C) and the number of passes of the reaction mixture through the venturi type hydrodynamic cavitation reactor n (1-12) on alkali-catalyzed transesterification of sunflower oil with methanol assisted by hydrodynamic cavitation (ACTC) on the value of the degree of triglyceride conversion (DTC) was investigated. ACTC was performed by the venturi-type hydrodynamic cavitation reactor (VCR) of our construction. It was found that the values of DTC increase with the increase in p 1, M 1, C c, and n, and decrease with the increase in T. Cavitation yield (CY) values were calculated. The ACTC was proved to be the simplest, fastest, and most highly energy-efficient current technology for the production of biodiesel. © 2021 Walter de Gruyter GmbH, Berlin/Boston.
71.
Gezović, A.; Mišurović, J.; Milovanović, B.; Etinski, M.; Krstić, J.; Grudić, V.; Dominko, R.; Mentus, S.; Vujković, M. J.
High Al-ion storage of vine shoots-derived activated carbon: New concept for affordable and sustainable supercapacitors Journal Article
In: Journal of Power Sources, 538 , 2022.
@article{Gezović2022,
title = {High Al-ion storage of vine shoots-derived activated carbon: New concept for affordable and sustainable supercapacitors},
author = {A. Gezović and J. Mišurović and B. Milovanović and M. Etinski and J. Krstić and V. Grudić and R. Dominko and S. Mentus and M. J. Vujković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85129772583&doi=10.1016%2fj.jpowsour.2022.231561&partnerID=40&md5=20611447ccccae9851b72fbfb3f559b8},
doi = {10.1016/j.jpowsour.2022.231561},
year = {2022},
date = {2022-01-01},
journal = {Journal of Power Sources},
volume = {538},
abstract = {New era heteroatom-doped carbons, relying on different biomass residues, play a rising role in contemporary carbon energy storage technology. Herein, an abundant waste of viticulture industry – vine shoots (VS) was carbonized and examined as electrode material for supercapacitors with non-conventional aqueous electrolyte. Biochar obtained by pre-carbonization treatment of vine shoots (at 300 °C) is impregnated with ZnCl2 at 600 °C (ACvs600) and 700 °C (ACvs700), to synthesize carbon with developed specific surface area, close to 1500 m2 g−1. The high specific capacitance of ACvs is achieved in Al-based electrolyte, which allows working voltage of 1.8 V ACvs700/Al2(SO4)3/ACvs700 cell delivers the energy density of 24 Wh kg−1 at 1 A g−1, which is higher than one measured in typical Na2SO4 (∼16 Wh kg−1) and H2SO4 electrolyte (∼11 Wh kg−1). By using Trasatti&Dunn surface charge distribution models, the reallocation of inner vs. outer charge in Al-based electrolyte is found to be different from that in H2SO4 electrolyte. The nature of the interaction between pristine/defective graphene and hydrated Al3+ ion is examined by Density Functional Theory (DFT) and discussed. Gathered experimental and theoretical data open novel perspectives for using carbon in more sustainable energy storage devices. © 2022 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
New era heteroatom-doped carbons, relying on different biomass residues, play a rising role in contemporary carbon energy storage technology. Herein, an abundant waste of viticulture industry – vine shoots (VS) was carbonized and examined as electrode material for supercapacitors with non-conventional aqueous electrolyte. Biochar obtained by pre-carbonization treatment of vine shoots (at 300 °C) is impregnated with ZnCl2 at 600 °C (ACvs600) and 700 °C (ACvs700), to synthesize carbon with developed specific surface area, close to 1500 m2 g−1. The high specific capacitance of ACvs is achieved in Al-based electrolyte, which allows working voltage of 1.8 V ACvs700/Al2(SO4)3/ACvs700 cell delivers the energy density of 24 Wh kg−1 at 1 A g−1, which is higher than one measured in typical Na2SO4 (∼16 Wh kg−1) and H2SO4 electrolyte (∼11 Wh kg−1). By using Trasatti&Dunn surface charge distribution models, the reallocation of inner vs. outer charge in Al-based electrolyte is found to be different from that in H2SO4 electrolyte. The nature of the interaction between pristine/defective graphene and hydrated Al3+ ion is examined by Density Functional Theory (DFT) and discussed. Gathered experimental and theoretical data open novel perspectives for using carbon in more sustainable energy storage devices. © 2022 Elsevier B.V.
72.
Živanović, A. S.; Bukonjić, A. M.; Jovanović-Stević, S.; Bogojeski, J.; Ćoćić, D.; Bijelić, A. P.; Ratković, Z. R.; Volarević, V.; Miloradović, D.; Tomović, D. L.; Radić, G. P.
In: Journal of Inorganic Biochemistry, 233 , 2022.
@article{Živanović2022,
title = {Complexes of copper(II) with tetradentate S,O-ligands: Synthesis, characterization, DNA/albumin interactions, molecular docking simulations and antitumor activity},
author = {A. S. Živanović and A. M. Bukonjić and S. Jovanović-Stević and J. Bogojeski and D. Ćoćić and A. P. Bijelić and Z. R. Ratković and V. Volarević and D. Miloradović and D. L. Tomović and G. P. Radić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130465709&doi=10.1016%2fj.jinorgbio.2022.111861&partnerID=40&md5=216e6b32434979076a68c1bf3e9d959e},
doi = {10.1016/j.jinorgbio.2022.111861},
year = {2022},
date = {2022-01-01},
journal = {Journal of Inorganic Biochemistry},
volume = {233},
abstract = {Four new complexes of copper(II) with S,O-tetradentate ligands, derivatives of thiosalicylic acid, encompassing an ethylene-, propylene-, butylene- and pentylene- bridge, were synthesized and characterized by microanalysis, molecular conductance and infrared (IR) spectra. The structures were assumed based on the previously mentioned analyses and confirmed with the results of electron paramagnetic resonance (EPR) spectra. The reactivity of complexes towards L-methionine (L-Met), L-cysteine (L-Cys) and guanosine-5′-monophosphate (5’-GMP) was also examined. Complex C1 ([Cu(S,O-ethylene-thiosalicylic acid)(H2O)2]) containing two inert methylene groups in the side chain of ligand shows the highest reactivity, while the least reactive is complex C4 ([Cu(S,O-pentylene-thiosalicylic acid)(H2O)2]) with five methylene groups. All complexes showed the highest reactivity towards L-Met and the lowest reactivity towards 5’-GMP. The interactions of complexes C1-C4 with calf thymus DNA (ct-DNA) were examined by ultraviolet-visible (UV–Vis) absorption and fluorescence spectral studies, revealing good DNA interaction abilities. All synthesized complexes C1-C4 show to interact with human serum albumin (HSA) with high values of binding constants. Complexes interaction with DNA/HSA was also confirmed using molecular docking simulations. All synthesized complexes reduce viability of human colon, breast and lung cancer cells, evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) colorimetric technique. The complex [Cu(S,O-pentylene- thiosalicylic acid)(H2O)2] showed the highest binding affinity constants to DNA/HSA and highest cytotoxicity, thus presenting a good candidate for further pharmacological research in the field of colon, breast and lung cancer therapy. © 2022 Elsevier Inc.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Four new complexes of copper(II) with S,O-tetradentate ligands, derivatives of thiosalicylic acid, encompassing an ethylene-, propylene-, butylene- and pentylene- bridge, were synthesized and characterized by microanalysis, molecular conductance and infrared (IR) spectra. The structures were assumed based on the previously mentioned analyses and confirmed with the results of electron paramagnetic resonance (EPR) spectra. The reactivity of complexes towards L-methionine (L-Met), L-cysteine (L-Cys) and guanosine-5′-monophosphate (5’-GMP) was also examined. Complex C1 ([Cu(S,O-ethylene-thiosalicylic acid)(H2O)2]) containing two inert methylene groups in the side chain of ligand shows the highest reactivity, while the least reactive is complex C4 ([Cu(S,O-pentylene-thiosalicylic acid)(H2O)2]) with five methylene groups. All complexes showed the highest reactivity towards L-Met and the lowest reactivity towards 5’-GMP. The interactions of complexes C1-C4 with calf thymus DNA (ct-DNA) were examined by ultraviolet-visible (UV–Vis) absorption and fluorescence spectral studies, revealing good DNA interaction abilities. All synthesized complexes C1-C4 show to interact with human serum albumin (HSA) with high values of binding constants. Complexes interaction with DNA/HSA was also confirmed using molecular docking simulations. All synthesized complexes reduce viability of human colon, breast and lung cancer cells, evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) colorimetric technique. The complex [Cu(S,O-pentylene- thiosalicylic acid)(H2O)2] showed the highest binding affinity constants to DNA/HSA and highest cytotoxicity, thus presenting a good candidate for further pharmacological research in the field of colon, breast and lung cancer therapy. © 2022 Elsevier Inc.
73.
Vasić, M. M.; Simatović, I. S.; Radović, L.; Minić, D. M.
Influence of microstructure of composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy on the corrosion behavior in various environments Journal Article
In: Corrosion Science, 204 , 2022.
@article{Vasić2022b,
title = {Influence of microstructure of composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy on the corrosion behavior in various environments},
author = {M. M. Vasić and I. S. Simatović and L. Radović and D. M. Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85131056159&doi=10.1016%2fj.corsci.2022.110403&partnerID=40&md5=cd44deb12832f805a7667250c0b193bb},
doi = {10.1016/j.corsci.2022.110403},
year = {2022},
date = {2022-01-01},
journal = {Corrosion Science},
volume = {204},
abstract = {Thermal analysis of the composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy, in correlation with the XRD analysis of its individual sides, shows that the changes in phase composition induced by thermal treatment are followed by changes in microstructural parameters of the already present or newly formed phases in the alloy. These changes influence the corrosion behavior of the alloy in 0.5 M NaOH, NaCl and HCl solutions, according to the potentiodynamic polarization and EIS measurements. Beside the phase composition, the microstructure including crystal orientation and the state of the alloy surface is observed to have a significant role in the overall corrosion behavior. © 2022 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal analysis of the composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy, in correlation with the XRD analysis of its individual sides, shows that the changes in phase composition induced by thermal treatment are followed by changes in microstructural parameters of the already present or newly formed phases in the alloy. These changes influence the corrosion behavior of the alloy in 0.5 M NaOH, NaCl and HCl solutions, according to the potentiodynamic polarization and EIS measurements. Beside the phase composition, the microstructure including crystal orientation and the state of the alloy surface is observed to have a significant role in the overall corrosion behavior. © 2022 Elsevier Ltd
74.
Žižić, M.; Stanić, M.; Aquilanti, G.; Bajuk-Bogdanović, D.; Branković, G.; Rodić, I.; Živić, M.; Zakrzewska, J.
Biotransformation of selenium in the mycelium of the fungus Phycomyces blakesleeanus Journal Article
In: Analytical and Bioanalytical Chemistry, 414 (20), pp. 6213-6222, 2022.
@article{Žižić20226213,
title = {Biotransformation of selenium in the mycelium of the fungus Phycomyces blakesleeanus},
author = {M. Žižić and M. Stanić and G. Aquilanti and D. Bajuk-Bogdanović and G. Branković and I. Rodić and M. Živić and J. Zakrzewska},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132892905&doi=10.1007%2fs00216-022-04191-4&partnerID=40&md5=ca7748f851603f7d63d0505157c7e812},
doi = {10.1007/s00216-022-04191-4},
year = {2022},
date = {2022-01-01},
journal = {Analytical and Bioanalytical Chemistry},
volume = {414},
number = {20},
pages = {6213-6222},
abstract = {Biotransformation of toxic selenium ions to non-toxic species has been mainly focused on biofortification of microorganisms and production of selenium nanoparticles (SeNPs), while far less attention is paid to the mechanisms of transformation. In this study, we applied a combination of analytical techniques with the aim of characterizing the SeNPs themselves as well as monitoring the course of selenium transformation in the mycelium of the fungus Phycomyces blakesleeanus. Red coloration and pungent odor that appeared after only a few hours of incubation with 10 mM Se+4 indicate the formation of SeNPs and volatile methylated selenium compounds. SEM–EDS confirmed pure selenium NPs with an average diameter of 57 nm, which indicates potentially very good medical, optical, and photoelectric characteristics. XANES of mycelium revealed concentration-dependent mechanisms of reduction, where 0.5 mM Se+4 led to the predominant formation of Se–S-containing organic molecules, while 10 mM Se+4 induced production of biomethylated selenide (Se−2) in the form of volatile dimethylselenide (DMSe) and selenium nanoparticles (SeNPs), with the SeNPs/DMSe ratio rising with incubation time. Several structural forms of elemental selenium, predominantly monoclinic Se8 chains, together with trigonal Se polymer chain, Se8 and Se6 ring structures, were detected by Raman spectroscopy. Graphical abstract: [Figure not available: see fulltext.] © 2022, Springer-Verlag GmbH Germany, part of Springer Nature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Biotransformation of toxic selenium ions to non-toxic species has been mainly focused on biofortification of microorganisms and production of selenium nanoparticles (SeNPs), while far less attention is paid to the mechanisms of transformation. In this study, we applied a combination of analytical techniques with the aim of characterizing the SeNPs themselves as well as monitoring the course of selenium transformation in the mycelium of the fungus Phycomyces blakesleeanus. Red coloration and pungent odor that appeared after only a few hours of incubation with 10 mM Se+4 indicate the formation of SeNPs and volatile methylated selenium compounds. SEM–EDS confirmed pure selenium NPs with an average diameter of 57 nm, which indicates potentially very good medical, optical, and photoelectric characteristics. XANES of mycelium revealed concentration-dependent mechanisms of reduction, where 0.5 mM Se+4 led to the predominant formation of Se–S-containing organic molecules, while 10 mM Se+4 induced production of biomethylated selenide (Se−2) in the form of volatile dimethylselenide (DMSe) and selenium nanoparticles (SeNPs), with the SeNPs/DMSe ratio rising with incubation time. Several structural forms of elemental selenium, predominantly monoclinic Se8 chains, together with trigonal Se polymer chain, Se8 and Se6 ring structures, were detected by Raman spectroscopy. Graphical abstract: [Figure not available: see fulltext.] © 2022, Springer-Verlag GmbH Germany, part of Springer Nature.
75.
Pagnacco, M. C.; Maksimović, J. P.; Nikolić, N. T.; Bogdanović, D. V. Bajuk; Kragović, M. M.; Stojmenović, M. D.; Blagojević, S. N.; Senćanski, J. V.
Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction Journal Article
In: Molecules, 27 (15), 2022.
@article{Pagnacco2022b,
title = {Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction},
author = {M. C. Pagnacco and J. P. Maksimović and N. T. Nikolić and D. V. Bajuk Bogdanović and M. M. Kragović and M. D. Stojmenović and S. N. Blagojević and J. V. Senćanski},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136341810&doi=10.3390%2fmolecules27154853&partnerID=40&md5=bf82aed326d15d5d071ac2c8437ff47e},
doi = {10.3390/molecules27154853},
year = {2022},
date = {2022-01-01},
journal = {Molecules},
volume = {27},
number = {15},
abstract = {Indigo carmine is a commonly used industrial blue dye. To determine its concentration in a commercially available food dye composed of a mixture of indigo carmine and D-glucose, this paper characterizes it through (ATR, KBr) FTIR micro-Raman as well as UV/Vis and clock: Briggs–Rauscher (BR) oscillatory reaction methods. The indigo carmine was detected in the bulk food dye only by applying micro-Raman spectroscopy, indicating a low percentage of the indigo carmine present. This research provides an improvement in the deviations from the experimental Raman spectrum as calculated by the B97D/cc-pVTZ level of theory one, resulting in a better geometrical optimization of the indigo carmine molecule compared to data within the literature. The analytical curves used to determine indigo carmine concentrations (and quantities) in an aqueous solution of food dye were applied by means of UV/Vis and BR methods. BR yielded significantly better analytical parameters: 100 times lower LOD and LOQ compared to commonly used UV/Vis. The remarkable sensitivity of the BR reaction towards indigo carmine suggests that not only does indigo carmine react in an oscillatory reaction but also its decomposition products, meaning that the multiple oxidation reactions have an important role in the BR’s indigo carmine mechanism. The novelty of this research is the investigation of indigo carmine using a clock BR reaction, opening new possibilities to determine indigo carmine in other complex samples (pharmaceutical, food, etc.). © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Indigo carmine is a commonly used industrial blue dye. To determine its concentration in a commercially available food dye composed of a mixture of indigo carmine and D-glucose, this paper characterizes it through (ATR, KBr) FTIR micro-Raman as well as UV/Vis and clock: Briggs–Rauscher (BR) oscillatory reaction methods. The indigo carmine was detected in the bulk food dye only by applying micro-Raman spectroscopy, indicating a low percentage of the indigo carmine present. This research provides an improvement in the deviations from the experimental Raman spectrum as calculated by the B97D/cc-pVTZ level of theory one, resulting in a better geometrical optimization of the indigo carmine molecule compared to data within the literature. The analytical curves used to determine indigo carmine concentrations (and quantities) in an aqueous solution of food dye were applied by means of UV/Vis and BR methods. BR yielded significantly better analytical parameters: 100 times lower LOD and LOQ compared to commonly used UV/Vis. The remarkable sensitivity of the BR reaction towards indigo carmine suggests that not only does indigo carmine react in an oscillatory reaction but also its decomposition products, meaning that the multiple oxidation reactions have an important role in the BR’s indigo carmine mechanism. The novelty of this research is the investigation of indigo carmine using a clock BR reaction, opening new possibilities to determine indigo carmine in other complex samples (pharmaceutical, food, etc.). © 2022 by the authors.
76.
Unterweger, C.; Ranzinger, M.; Duchoslav, J.; Piana, F.; Pasti, I.; Zeppetzauer, F.; Breitenbach, S.; Stifter, D.; Fürst, C.
Electrically Conductive Biocomposites Based on Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Wood-Derived Carbon Fillers Journal Article
In: Journal of Composites Science, 6 (8), 2022.
@article{Unterweger2022,
title = {Electrically Conductive Biocomposites Based on Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Wood-Derived Carbon Fillers},
author = {C. Unterweger and M. Ranzinger and J. Duchoslav and F. Piana and I. Pasti and F. Zeppetzauer and S. Breitenbach and D. Stifter and C. Fürst},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136838957&doi=10.3390%2fjcs6080228&partnerID=40&md5=7ab0a95b2a771cfe7ec0cdef57e70e43},
doi = {10.3390/jcs6080228},
year = {2022},
date = {2022-01-01},
journal = {Journal of Composites Science},
volume = {6},
number = {8},
abstract = {In this paper, biobased carbons were used as fillers in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). The mechanical and electrical properties of these 100% biocomposites were analyzed. First, biocarbons were prepared from wood dust and cellulose fibers using carbonization temperatures ranging 900–2300 °C. XRD revealed significant improvements of the graphitic structure with increasing temperatures for both precursors, with slightly higher ordering in wood-dust-based carbons. An increase of the carbon content with continuous removal of other elements was observed with increasing temperature. The carbonized cellulose fiber showed an accumulation of Na and O on the fiber surface at a carbonization temperature of 1500 °C. Significant degradation of PHBV was observed when mixed with this specific filler, which can, most probably, be attributed to this exceptional surface chemistry. With any other fillers, the preparation of injection-molded PHBV composites was possible without any difficulties. Small improvements in the mechanical performance were observed, with carbonized fibers being slightly superior to the wood dust analogues. Improvements at higher filler content were observed. These effects were even more pronounced in the electrical conductivity. In the range of 15–20 vol.% carbonized fibers, the percolation threshold could be reached, resulting in an electrical conductivity of 0.7 S/cm. For comparison, polypropylene composites were prepared using cellulose fibers carbonized at 2000 °C. Due to longer fibers retained in the composites, percolation could be reached in the range of 5–10 vol.%. The electrical conductivity was even higher compared to that of composites using commercial carbon fibers, showing a great potential for carbonized cellulose fibers in electrical applications. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, biobased carbons were used as fillers in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). The mechanical and electrical properties of these 100% biocomposites were analyzed. First, biocarbons were prepared from wood dust and cellulose fibers using carbonization temperatures ranging 900–2300 °C. XRD revealed significant improvements of the graphitic structure with increasing temperatures for both precursors, with slightly higher ordering in wood-dust-based carbons. An increase of the carbon content with continuous removal of other elements was observed with increasing temperature. The carbonized cellulose fiber showed an accumulation of Na and O on the fiber surface at a carbonization temperature of 1500 °C. Significant degradation of PHBV was observed when mixed with this specific filler, which can, most probably, be attributed to this exceptional surface chemistry. With any other fillers, the preparation of injection-molded PHBV composites was possible without any difficulties. Small improvements in the mechanical performance were observed, with carbonized fibers being slightly superior to the wood dust analogues. Improvements at higher filler content were observed. These effects were even more pronounced in the electrical conductivity. In the range of 15–20 vol.% carbonized fibers, the percolation threshold could be reached, resulting in an electrical conductivity of 0.7 S/cm. For comparison, polypropylene composites were prepared using cellulose fibers carbonized at 2000 °C. Due to longer fibers retained in the composites, percolation could be reached in the range of 5–10 vol.%. The electrical conductivity was even higher compared to that of composites using commercial carbon fibers, showing a great potential for carbonized cellulose fibers in electrical applications. © 2022 by the authors.
77.
Dorontic, S.; Bonasera, A.; Scopelliti, M.; Markovic, O.; Bogdanović, D. Bajuk; Ciasca, G.; Romanò, S.; Dimkić, I.; Budimir, M.; Marinković, D.; Jovanovic, S.
In: Nanomaterials, 12 (15), 2022.
@article{Dorontic2022,
title = {Gamma-Ray-Induced Structural Transformation of GQDs towards the Improvement of Their Optical Properties, Monitoring of Selected Toxic Compounds, and Photo-Induced Effects on Bacterial Strains},
author = {S. Dorontic and A. Bonasera and M. Scopelliti and O. Markovic and D. Bajuk Bogdanović and G. Ciasca and S. Romanò and I. Dimkić and M. Budimir and D. Marinković and S. Jovanovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136923871&doi=10.3390%2fnano12152714&partnerID=40&md5=380f14a3d3170b313b00d860a83c1768},
doi = {10.3390/nano12152714},
year = {2022},
date = {2022-01-01},
journal = {Nanomaterials},
volume = {12},
number = {15},
abstract = {Structural modification of different carbon-based nanomaterials is often necessary to improve their morphology and optical properties, particularly the incorporation of N-atoms in graphene quantum dots (GQDs). Here, a clean, simple, one-step, and eco-friendly method for N-doping of GQDs using gamma irradiation is reported. GQDs were irradiated in the presence of the different ethylenediamine (EDA) amounts (1 g, 5 g, and 10 g) and the highest % of N was detected in the presence of 10 g. N-doped GQDs emitted strong, blue photoluminescence (PL). Photoluminescence quantum yield was increased from 1.45, as obtained for non-irradiated dots, to 7.24% for those irradiated in the presence of 1 g of EDA. Modified GQDs were investigated as a PL probe for the detection of insecticide Carbofuran (2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate) and herbicide Amitrole (3-amino-1,2,4-triazole). The limit of detection was 5.4 μmol L−1 for Carbofuran. For the first time, Amitrole was detected by GQDs in a turn-off/turn-on mechanism using Pd(II) ions as a quenching agent. First, Pd(II) ions were quenched (turn-off) PL of GQDs, while after Amitrole addition, PL was recovered linearly with Amitrole concentration (turn-on). LOD was 2.03 μmol L−1. These results suggest that modified GQDs can be used as an efficient new material for Carbofuran and Amitrole detection. Furthermore, the phototoxicity of dots was investigated on both Gram-positive and Gram-negative bacterial strains. When bacterial cells were exposed to different GQD concentrations and illuminated with light of 470 nm wavelength, the toxic effects were not observed. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Structural modification of different carbon-based nanomaterials is often necessary to improve their morphology and optical properties, particularly the incorporation of N-atoms in graphene quantum dots (GQDs). Here, a clean, simple, one-step, and eco-friendly method for N-doping of GQDs using gamma irradiation is reported. GQDs were irradiated in the presence of the different ethylenediamine (EDA) amounts (1 g, 5 g, and 10 g) and the highest % of N was detected in the presence of 10 g. N-doped GQDs emitted strong, blue photoluminescence (PL). Photoluminescence quantum yield was increased from 1.45, as obtained for non-irradiated dots, to 7.24% for those irradiated in the presence of 1 g of EDA. Modified GQDs were investigated as a PL probe for the detection of insecticide Carbofuran (2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate) and herbicide Amitrole (3-amino-1,2,4-triazole). The limit of detection was 5.4 μmol L−1 for Carbofuran. For the first time, Amitrole was detected by GQDs in a turn-off/turn-on mechanism using Pd(II) ions as a quenching agent. First, Pd(II) ions were quenched (turn-off) PL of GQDs, while after Amitrole addition, PL was recovered linearly with Amitrole concentration (turn-on). LOD was 2.03 μmol L−1. These results suggest that modified GQDs can be used as an efficient new material for Carbofuran and Amitrole detection. Furthermore, the phototoxicity of dots was investigated on both Gram-positive and Gram-negative bacterial strains. When bacterial cells were exposed to different GQD concentrations and illuminated with light of 470 nm wavelength, the toxic effects were not observed. © 2022 by the authors.
78.
Milikić, J.; Knežević, S.; Stojadinović, S.; Alsaiari, M.; Harraz, F. A.; Santos, D. M. F.; Šljukić, B.
In: Nanomaterials, 12 (15), 2022.
@article{Milikić2022c,
title = {Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media},
author = {J. Milikić and S. Knežević and S. Stojadinović and M. Alsaiari and F. A. Harraz and D. M. F. Santos and B. Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136943992&doi=10.3390%2fnano12152657&partnerID=40&md5=cdc4392f2cea0be60e1903319007d422},
doi = {10.3390/nano12152657},
year = {2022},
date = {2022-01-01},
journal = {Nanomaterials},
volume = {12},
number = {15},
abstract = {Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec−1, significantly lower than that for CuAg/rGO (184 mV dec−1), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm−2) than for CuAg/rGO (−1.74 mA cm−2). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm−2) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm−2). © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec−1, significantly lower than that for CuAg/rGO (184 mV dec−1), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm−2) than for CuAg/rGO (−1.74 mA cm−2). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm−2) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm−2). © 2022 by the authors.
79.
Jevtović, V.; Hamoud, H.; Al-Zahrani, S.; Alenezi, K.; Latif, S.; Alanazi, T.; Abdulaziz, F.; Dimić, D.
In: Molecules, 27 (15), 2022.
@article{Jevtović2022b,
title = {Synthesis, Crystal Structure, Quantum Chemical Analysis, Electrochemical Behavior, and Antibacterial and Photocatalytic Activity of Co Complex with Pyridoxal-(S-Methyl)-isothiosemicarbazone Ligand},
author = {V. Jevtović and H. Hamoud and S. Al-Zahrani and K. Alenezi and S. Latif and T. Alanazi and F. Abdulaziz and D. Dimić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85137012364&doi=10.3390%2fmolecules27154809&partnerID=40&md5=f9c7d349a8b08e99fb4513cfac71020b},
doi = {10.3390/molecules27154809},
year = {2022},
date = {2022-01-01},
journal = {Molecules},
volume = {27},
number = {15},
abstract = {New complex Co(III) with ligand Pyridoxal-S-methyl-isothiosemicarbazone, (PLITSC) was synthesized. X-ray analysis showed the bis-ligand octahedral structure of the cobalt complex [Co(PLITSC-H)2]BrNO3·CH3OH (compound 1). The intermolecular interactions governing the crystal structure were described by the Hirsfeld surface analysis. The structure of compound 1 and the corresponding Zn complex (([Zn(PLTSC)(H2O)2]SO4·H2O)) were optimized at the B3LYP/6–31 + G (d,p)/LanL2DZ level of theory, and the applicability was assessed by comparison with the crystallographic structure. The natural bond orbital analysis was used for the discussion on the stability of formed compounds. The antibacterial activity of obtained complexes towards S. aureus and E. coli was determined, along with the effect of compound 1 on the formation of free radical species. Activity of compound 1 towards the removal of methylene blue was also investigated. The voltammograms of these compounds showed the reduction of metal ions, as well as the catalyzed reduction of CO2 in acidic media. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
New complex Co(III) with ligand Pyridoxal-S-methyl-isothiosemicarbazone, (PLITSC) was synthesized. X-ray analysis showed the bis-ligand octahedral structure of the cobalt complex [Co(PLITSC-H)2]BrNO3·CH3OH (compound 1). The intermolecular interactions governing the crystal structure were described by the Hirsfeld surface analysis. The structure of compound 1 and the corresponding Zn complex (([Zn(PLTSC)(H2O)2]SO4·H2O)) were optimized at the B3LYP/6–31 + G (d,p)/LanL2DZ level of theory, and the applicability was assessed by comparison with the crystallographic structure. The natural bond orbital analysis was used for the discussion on the stability of formed compounds. The antibacterial activity of obtained complexes towards S. aureus and E. coli was determined, along with the effect of compound 1 on the formation of free radical species. Activity of compound 1 towards the removal of methylene blue was also investigated. The voltammograms of these compounds showed the reduction of metal ions, as well as the catalyzed reduction of CO2 in acidic media. © 2022 by the authors.
80.
Milikić, J.; Fuentes, R. O.; Tasca, J. E.; Santos, D. M. F.; Šljukić, B.; Figueiredo, F. M. L.
Nickel-Doped Ceria Bifunctional Electrocatalysts for Oxygen Reduction and Evolution in Alkaline Media Journal Article
In: Batteries, 8 (8), 2022.
@article{Milikić2022,
title = {Nickel-Doped Ceria Bifunctional Electrocatalysts for Oxygen Reduction and Evolution in Alkaline Media},
author = {J. Milikić and R. O. Fuentes and J. E. Tasca and D. M. F. Santos and B. Šljukić and F. M. L. Figueiredo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85137340400&doi=10.3390%2fbatteries8080100&partnerID=40&md5=9c47bdd88671a5aa6c2e4db22ecf0116},
doi = {10.3390/batteries8080100},
year = {2022},
date = {2022-01-01},
journal = {Batteries},
volume = {8},
number = {8},
abstract = {Nickel-doped ceria (Ce1−xNixO2−δ) nanopowders (7 to 5 nm in size) synthesized by the cation complexation method with 5, 10, 15, and 20 Ni at.% are studied with respect to their electrochemical activity for the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline medium. One finds good bifunctional electrocatalytic activity of the four Ce1−xNixO2−δ electrocatalysts. The Tafel analysis of the ORR in the 0.57–0.78 V vs. RHE potential window leads to slopes in the 70–108 mV dec−1 range. The number of electrons exchanged during ORR is between 2 and 2.7. The OER Tafel slopes are determined to be in the range 192 –281 mV dec−1. OER activation energies are found to range between 28 and 43 kJ mol−1. The specific capacitance of Ce1−xNixO2−δ electrocatalysts measured at a scan rate of 100 mV s−1 varies between 0.7 and 1.4 Fg−1. The results demonstrate that Ce1−xNixO2−δ nanopowders can act as bifunctional electrocatalysts for ORR/OER for potential application in the oxygen electrode of devices such as rechargeable metal–air batteries. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nickel-doped ceria (Ce1−xNixO2−δ) nanopowders (7 to 5 nm in size) synthesized by the cation complexation method with 5, 10, 15, and 20 Ni at.% are studied with respect to their electrochemical activity for the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline medium. One finds good bifunctional electrocatalytic activity of the four Ce1−xNixO2−δ electrocatalysts. The Tafel analysis of the ORR in the 0.57–0.78 V vs. RHE potential window leads to slopes in the 70–108 mV dec−1 range. The number of electrons exchanged during ORR is between 2 and 2.7. The OER Tafel slopes are determined to be in the range 192 –281 mV dec−1. OER activation energies are found to range between 28 and 43 kJ mol−1. The specific capacitance of Ce1−xNixO2−δ electrocatalysts measured at a scan rate of 100 mV s−1 varies between 0.7 and 1.4 Fg−1. The results demonstrate that Ce1−xNixO2−δ nanopowders can act as bifunctional electrocatalysts for ORR/OER for potential application in the oxygen electrode of devices such as rechargeable metal–air batteries. © 2022 by the authors.
2022
Dobrota, A. S.; Vlahović, J.; Skorodumova, N. V.; Pašti, I. A.
In: Materials Today Communications, 31 , 2022.
@article{Dobrota2022,
title = {First-principles analysis of aluminium interaction with nitrogen-doped graphene nanoribbons – from adatom bonding to various potential applications},
author = {A. S. Dobrota and J. Vlahović and N. V. Skorodumova and I. A. Pašti},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127560615&doi=10.1016%2fj.mtcomm.2022.103388&partnerID=40&md5=b21cd383246be145b0b0d5e14911a46c},
doi = {10.1016/j.mtcomm.2022.103388},
year = {2022},
date = {2022-01-01},
journal = {Materials Today Communications},
volume = {31},
abstract = {Enhancing aluminium interaction with graphene-based materials is of crucial importance for the development of Al-storage materials and novel functional materials via atomically precise doping. Here, DFT calculations are employed to investigate Al interactions with non-doped and N-doped graphene nanoribbons (GNRs) and address the impact of the edge sites and N-containing defects on the material's reactivity towards Al. The presence of edges does not influence the energetics of Al adsorption significantly (compared to pristine graphene sheet). On the other hand, N-doping of graphene nanoribbons is found to affect the adsorption energy of Al to an extent that strongly depends on the type of N-containing defect. The introduction of edge −NO group and doping with in-plane pyridinic N result in Al adsorption nearly twice as strong as on pristine graphene. Moreover, double n-type doping via N and Al significantly alters the electronic structure of Al,N-containing GNRs. Our results suggest that selectively doped GNRs with pyridinic N can have enhanced Al-storage capacity and could be potentially used for selective Al electrosorption and removal. On the other hand, Al,N-containing GNRs with pyridinic N could also be used in resistive sensors for mechanical deformation. Namely, strain along the longitudinal axis of these dual doped GNRs does not affect the binding of Al but tunes the bandgap and causes more than 700-fold change in the conductivity. Thus, careful defect engineering and selective doping of GNRs with N (and Al) could lead to novel multifunctional materials with exceptional properties.[Formula presented] © 2022 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Enhancing aluminium interaction with graphene-based materials is of crucial importance for the development of Al-storage materials and novel functional materials via atomically precise doping. Here, DFT calculations are employed to investigate Al interactions with non-doped and N-doped graphene nanoribbons (GNRs) and address the impact of the edge sites and N-containing defects on the material's reactivity towards Al. The presence of edges does not influence the energetics of Al adsorption significantly (compared to pristine graphene sheet). On the other hand, N-doping of graphene nanoribbons is found to affect the adsorption energy of Al to an extent that strongly depends on the type of N-containing defect. The introduction of edge −NO group and doping with in-plane pyridinic N result in Al adsorption nearly twice as strong as on pristine graphene. Moreover, double n-type doping via N and Al significantly alters the electronic structure of Al,N-containing GNRs. Our results suggest that selectively doped GNRs with pyridinic N can have enhanced Al-storage capacity and could be potentially used for selective Al electrosorption and removal. On the other hand, Al,N-containing GNRs with pyridinic N could also be used in resistive sensors for mechanical deformation. Namely, strain along the longitudinal axis of these dual doped GNRs does not affect the binding of Al but tunes the bandgap and causes more than 700-fold change in the conductivity. Thus, careful defect engineering and selective doping of GNRs with N (and Al) could lead to novel multifunctional materials with exceptional properties.[Formula presented] © 2022 Elsevier Ltd
Petrusic, I.; Valle, G.; Dakovic, M.; Damjanovic, D.; Bumbasirevic, M.; Raspopovic, S.
Plastic changes in the brain after a neuro-prosthetic leg use Journal Article
In: Clinical Neurophysiology, 138 , pp. 186-188, 2022.
@article{Petrusic2022186,
title = {Plastic changes in the brain after a neuro-prosthetic leg use},
author = {I. Petrusic and G. Valle and M. Dakovic and D. Damjanovic and M. Bumbasirevic and S. Raspopovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85128716671&doi=10.1016%2fj.clinph.2022.04.001&partnerID=40&md5=db9075472a77bf8a95867a530721ca40},
doi = {10.1016/j.clinph.2022.04.001},
year = {2022},
date = {2022-01-01},
journal = {Clinical Neurophysiology},
volume = {138},
pages = {186-188},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Popović, A.; Manojlović, V.; Adnadjević, B.; Petrović, J.; Kamberović, Ž.; Ranitović, M.
Recovery of Rare-Earth Elements from Printed Circuit Boards by Vacuum Pyrolysis and Multiple Electrostatic Separation Journal Article
In: Processes, 10 (6), 2022.
@article{Popović2022,
title = {Recovery of Rare-Earth Elements from Printed Circuit Boards by Vacuum Pyrolysis and Multiple Electrostatic Separation},
author = {A. Popović and V. Manojlović and B. Adnadjević and J. Petrović and Ž. Kamberović and M. Ranitović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132195518&doi=10.3390%2fpr10061152&partnerID=40&md5=fe72c6658cb2927c7ddaf7e011cd1913},
doi = {10.3390/pr10061152},
year = {2022},
date = {2022-01-01},
journal = {Processes},
volume = {10},
number = {6},
abstract = {The influence of the multi-stage electrostatic separation (ESS) of mechanically treated and magnetically separated waste electronic material and the pyrolysis of the selected ESS fraction on the distribution of metal elements (MEs), elements contained in refractory oxides (EROs), bromine (Br), and rare-earth elements (REEs) contained in waste electronic material was studied. The concentration of MEs, Br, and EROs in the tested samples was determined by X-ray fluorescence analysis, and the concentration of REEs and uranium was determined by inductively coupled plasma mass spectrometry (ICP-MS). The analysis of the distribution of elements during the multi-stage ESS showed that MEs were predominantly distributed in the conductive fraction and Br, EROs, and REEs were distributed in the nonconductive fraction. The nonconductive fraction (NC2) of the two-stage ESS was subjected to a low-temperature vacuum pyrolysis (T = 550◦C},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The influence of the multi-stage electrostatic separation (ESS) of mechanically treated and magnetically separated waste electronic material and the pyrolysis of the selected ESS fraction on the distribution of metal elements (MEs), elements contained in refractory oxides (EROs), bromine (Br), and rare-earth elements (REEs) contained in waste electronic material was studied. The concentration of MEs, Br, and EROs in the tested samples was determined by X-ray fluorescence analysis, and the concentration of REEs and uranium was determined by inductively coupled plasma mass spectrometry (ICP-MS). The analysis of the distribution of elements during the multi-stage ESS showed that MEs were predominantly distributed in the conductive fraction and Br, EROs, and REEs were distributed in the nonconductive fraction. The nonconductive fraction (NC2) of the two-stage ESS was subjected to a low-temperature vacuum pyrolysis (T = 550◦C
Vesković, A.; Nakarada, Ð.; Vasiljević, O.; Dobrov, A.; Spengler, G.; Enyedy, É. A.; Arion, V. B.; Bijelić, A. P.
The Release of a Highly Cytotoxic Paullone Bearing a TEMPO Free Radical from the HSA Hydrogel: An EPR Spectroscopic Characterization Journal Article
In: Pharmaceutics, 14 (6), 2022.
@article{Vesković2022,
title = {The Release of a Highly Cytotoxic Paullone Bearing a TEMPO Free Radical from the HSA Hydrogel: An EPR Spectroscopic Characterization},
author = {A. Vesković and Ð. Nakarada and O. Vasiljević and A. Dobrov and G. Spengler and É. A. Enyedy and V. B. Arion and A. P. Bijelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132295538&doi=10.3390%2fpharmaceutics14061174&partnerID=40&md5=69d534c18091333f09a4537603150432},
doi = {10.3390/pharmaceutics14061174},
year = {2022},
date = {2022-01-01},
journal = {Pharmaceutics},
volume = {14},
number = {6},
abstract = {This study shows the potential of a thermally induced human serum albumin (HSA) hydrogel to serve as a drug depot for sustained release of a highly cytotoxic modified paullone ligand bearing a TEMPO free radical (HL). The binding of HL to HSA was studied by electron paramagnetic resonance (EPR) spectroscopy and imaging. The EPR protocol was also implemented for the study of matrix degradation, and ligand diffusion rate, in two additional spin-labeled hydrogels, containing 5-doxylstearate and 3-carbamoyl-proxyl. The results showed that the hydrogel is an efficient HL reservoir as it retained 60% of the ligand during 11 days of dialysis in physiological saline. Furthermore, upon incubation with Colo 205 human colon adenocarcinoma cells for 3 days, the HL/HSA hydrogel did not exhibit cytotoxic activity, demonstrating that it is also an efficient ligand depot in the presence of living cells. It was observed that the percentage of HL release is independent of its initial concentration in the hydrogel, suggesting that HSA possesses a specific binding site for the ligand, most likely Sudlow site 2, as predicted by molecular docking. The intrinsic property of albumin to bind and transport various substances, including hydrophobic drugs, may be fine-tuned by appropriate physical/chemical hydrogel preparation procedures, providing optimal drug delivery. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study shows the potential of a thermally induced human serum albumin (HSA) hydrogel to serve as a drug depot for sustained release of a highly cytotoxic modified paullone ligand bearing a TEMPO free radical (HL). The binding of HL to HSA was studied by electron paramagnetic resonance (EPR) spectroscopy and imaging. The EPR protocol was also implemented for the study of matrix degradation, and ligand diffusion rate, in two additional spin-labeled hydrogels, containing 5-doxylstearate and 3-carbamoyl-proxyl. The results showed that the hydrogel is an efficient HL reservoir as it retained 60% of the ligand during 11 days of dialysis in physiological saline. Furthermore, upon incubation with Colo 205 human colon adenocarcinoma cells for 3 days, the HL/HSA hydrogel did not exhibit cytotoxic activity, demonstrating that it is also an efficient ligand depot in the presence of living cells. It was observed that the percentage of HL release is independent of its initial concentration in the hydrogel, suggesting that HSA possesses a specific binding site for the ligand, most likely Sudlow site 2, as predicted by molecular docking. The intrinsic property of albumin to bind and transport various substances, including hydrophobic drugs, may be fine-tuned by appropriate physical/chemical hydrogel preparation procedures, providing optimal drug delivery. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Mladenović, D.; Daş, E.; Santos, D. M. F.; Yurtcan, A. B.; Miljanić,; Šljukić, B.
Boosting oxygen electrode kinetics by addition of cost-effective transition metals (Ni, Fe, Cu) to platinum on graphene nanoplatelets Journal Article
In: Journal of Alloys and Compounds, 905 , 2022.
@article{Mladenović2022,
title = {Boosting oxygen electrode kinetics by addition of cost-effective transition metals (Ni, Fe, Cu) to platinum on graphene nanoplatelets},
author = {D. Mladenović and E. Daş and D. M. F. Santos and A. B. Yurtcan and Miljanić and B. Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85126115770&doi=10.1016%2fj.jallcom.2022.164156&partnerID=40&md5=6339fa648d3d538c4d5e92efdc63ce19},
doi = {10.1016/j.jallcom.2022.164156},
year = {2022},
date = {2022-01-01},
journal = {Journal of Alloys and Compounds},
volume = {905},
abstract = {Pt and Pt-M (M = Ni, Fe, Cu) nanoparticles supported on graphene nanoplatelets (GNPs) were synthesized by simultaneous supercritical carbon dioxide deposition method. Morphology analysis by TEM revealed the formation of metal nanoparticles of 2–3 nm size uniformly distributed over GNPs, while XPS was used to determine their oxidation states. Four materials were tested as electrocatalysts for ORR and OER in unitized regenerative fuel cells and rechargeable metal-air batteries. PtFe/GNPs exhibited favorable ORR kinetics in terms of the highest diffusion-limited current density, the lowest Tafel slope, and a high number of exchanged electrons (n = 3.66), which might be attributed to its high double-layer capacitance and, thus, high electrochemically active surface area. Furthermore, this material performance was comparable to that of commercial Pt/C electrocatalyst containing double the amount of Pt. The same material showed the best performance toward OER as evidenced by the highest current density, the lowest value of exchange current density, and overpotential to reach a current density of 10 mA cm-2, as well as the lowest Tafel slope. © 2022 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pt and Pt-M (M = Ni, Fe, Cu) nanoparticles supported on graphene nanoplatelets (GNPs) were synthesized by simultaneous supercritical carbon dioxide deposition method. Morphology analysis by TEM revealed the formation of metal nanoparticles of 2–3 nm size uniformly distributed over GNPs, while XPS was used to determine their oxidation states. Four materials were tested as electrocatalysts for ORR and OER in unitized regenerative fuel cells and rechargeable metal-air batteries. PtFe/GNPs exhibited favorable ORR kinetics in terms of the highest diffusion-limited current density, the lowest Tafel slope, and a high number of exchanged electrons (n = 3.66), which might be attributed to its high double-layer capacitance and, thus, high electrochemically active surface area. Furthermore, this material performance was comparable to that of commercial Pt/C electrocatalyst containing double the amount of Pt. The same material showed the best performance toward OER as evidenced by the highest current density, the lowest value of exchange current density, and overpotential to reach a current density of 10 mA cm-2, as well as the lowest Tafel slope. © 2022 Elsevier B.V.
Milakin, K. A.; Gupta, S.; Pop-Georgievski, O.; Morávková, Z.; Acharya, U.; Taboubi, O.; Breitenbach, S.; Gavrilov, N.; Unterweger, C.; Bober, P.
Macroporous nitrogen-containing carbon for electrochemical capacitors Journal Article
In: Electrochimica Acta, 418 , 2022.
@article{Milakin2022,
title = {Macroporous nitrogen-containing carbon for electrochemical capacitors},
author = {K. A. Milakin and S. Gupta and O. Pop-Georgievski and Z. Morávková and U. Acharya and O. Taboubi and S. Breitenbach and N. Gavrilov and C. Unterweger and P. Bober},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85128482422&doi=10.1016%2fj.electacta.2022.140370&partnerID=40&md5=119ed5a44924c072ce885ad2608737e7},
doi = {10.1016/j.electacta.2022.140370},
year = {2022},
date = {2022-01-01},
journal = {Electrochimica Acta},
volume = {418},
abstract = {Polypyrrole-gelatin aerogels were synthesized by a one-step cryopolymerization approach and carbonized at various temperatures (100–700 °C). The mechanical integrity and macroporous morphology (pore size 4–16 µm) of materials carbonized at all studied temperatures were preserved after carbonization. Raman and X-ray photoelectron spectroscopies confirmed the aerogel conversion to carbon with gradually enhanced structural order at higher temperatures (300–600 °C). Change of the material conductivity with carbonization temperature follows the evolution of its molecular structure, reaching 2 × 10–5 S cm–1 for a fully carbonized aerogel (700 °C). Specific surface area and total pore volume values for the carbonized material were ⁓one order of magnitude higher (441.7 m2 g–1 and 0.21 cm3 g–1 at 600 °C, respectively) compared to the ones of the precursor. Cyclic voltammetry measurements showed that gravimetric capacitance of the products increased at higher carbonization temperatures up to 209 F g–1 (700 °C) and was stable for at least 1000 cycles. Galvanostatic charge-discharge method showed the highest capacitance 273 F g–1 (1 M HCl). The prepared nitrogen-containing carbon materials can be potentially used for supercapacitor applications. © 2022 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Polypyrrole-gelatin aerogels were synthesized by a one-step cryopolymerization approach and carbonized at various temperatures (100–700 °C). The mechanical integrity and macroporous morphology (pore size 4–16 µm) of materials carbonized at all studied temperatures were preserved after carbonization. Raman and X-ray photoelectron spectroscopies confirmed the aerogel conversion to carbon with gradually enhanced structural order at higher temperatures (300–600 °C). Change of the material conductivity with carbonization temperature follows the evolution of its molecular structure, reaching 2 × 10–5 S cm–1 for a fully carbonized aerogel (700 °C). Specific surface area and total pore volume values for the carbonized material were ⁓one order of magnitude higher (441.7 m2 g–1 and 0.21 cm3 g–1 at 600 °C, respectively) compared to the ones of the precursor. Cyclic voltammetry measurements showed that gravimetric capacitance of the products increased at higher carbonization temperatures up to 209 F g–1 (700 °C) and was stable for at least 1000 cycles. Galvanostatic charge-discharge method showed the highest capacitance 273 F g–1 (1 M HCl). The prepared nitrogen-containing carbon materials can be potentially used for supercapacitor applications. © 2022 Elsevier Ltd
Bubanja, I. N.; Stanisavljev, D.
Continuous measurements of gaseous oxygen production in Bray-Liebhafsky oscillatory reaction and its correlation with the reaction mechanism Journal Article
In: Inorganic Chemistry Communications, 141 , 2022.
@article{Bubanja2022,
title = {Continuous measurements of gaseous oxygen production in Bray-Liebhafsky oscillatory reaction and its correlation with the reaction mechanism},
author = {I. N. Bubanja and D. Stanisavljev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85129715483&doi=10.1016%2fj.inoche.2022.109528&partnerID=40&md5=f884bf0520171c778fa3a472a5e34d70},
doi = {10.1016/j.inoche.2022.109528},
year = {2022},
date = {2022-01-01},
journal = {Inorganic Chemistry Communications},
volume = {141},
abstract = {Upgraded design of the experimental setup for monitoring Bray-Liebhafsky (BL) oscillatory reaction dynamics allowed simultaneous recording of platinum electrode potential and gaseous pressure changes over time. Experiments were performed at two stirring rates (600 rpm and 1200 rpm) in five replicates. Evolved gas at two mixing rates is correlated with reaction induction period, number of oscillations, period between oscillations, oscillation amplitude and number of produced oxygen moles per oscillation. Obtained trends indicate that the amount of formed gas facilitates initiation of iodine oxidation. Results are in agreement with previous findings which point to the importance of heterogeneous effects in reaction of iodine oxidation. © 2022 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Upgraded design of the experimental setup for monitoring Bray-Liebhafsky (BL) oscillatory reaction dynamics allowed simultaneous recording of platinum electrode potential and gaseous pressure changes over time. Experiments were performed at two stirring rates (600 rpm and 1200 rpm) in five replicates. Evolved gas at two mixing rates is correlated with reaction induction period, number of oscillations, period between oscillations, oscillation amplitude and number of produced oxygen moles per oscillation. Obtained trends indicate that the amount of formed gas facilitates initiation of iodine oxidation. Results are in agreement with previous findings which point to the importance of heterogeneous effects in reaction of iodine oxidation. © 2022 Elsevier B.V.
Milikić, J.; Nikolić, N.; Santos, D. M. F.; Macciò, D.; Saccone, A.; Alsaiari, M.; Jalalah, M.; Faisal, M.; Harraz, F. A.; Li, Y.; Nassr, A. B.; Pašti, I.; Šljukić, B.
Platinum–Dysprosium Alloys as Oxygen Electrodes in Alkaline Media: An Experimental and Theoretical Study Journal Article
In: Nanomaterials, 12 (14), 2022.
@article{Milikić2022d,
title = {Platinum–Dysprosium Alloys as Oxygen Electrodes in Alkaline Media: An Experimental and Theoretical Study},
author = {J. Milikić and N. Nikolić and D. M. F. Santos and D. Macciò and A. Saccone and M. Alsaiari and M. Jalalah and M. Faisal and F. A. Harraz and Y. Li and A. B. Nassr and I. Pašti and B. Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85133310202&doi=10.3390%2fnano12142318&partnerID=40&md5=9dbebb67a40be2265484695e6aab8c9a},
doi = {10.3390/nano12142318},
year = {2022},
date = {2022-01-01},
journal = {Nanomaterials},
volume = {12},
number = {14},
abstract = {Platinum–dysprosium (Pt–Dy) alloys prepared by the arc melting technique are assessed as potential electrodes for the oxygen reduction reaction (ORR) using voltammetry and chronoamperometry in alkaline media. A relatively small change (10 at.%) in the alloy composition brought a notable difference in the alloys’ performance for the ORR. Pt40Dy60 electrode, i.e., the electrode with a lower amount of Pt, was identified to have a higher activity towards ORR as evidenced by lower overpotential and higher current densities under identical experimental conditions. Furthermore, DFT calculations point out the unique single-atom-like coordination and electronic structure of Pt atoms in the Pt40Dy60 surface as responsible for enhanced ORR activity compared to the alloy with a higher Pt content. Additionally, Pt–Dy alloys showed activity in the oxygen evolution reaction (OER), with the OER current density lower than that of pure Pt. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Platinum–dysprosium (Pt–Dy) alloys prepared by the arc melting technique are assessed as potential electrodes for the oxygen reduction reaction (ORR) using voltammetry and chronoamperometry in alkaline media. A relatively small change (10 at.%) in the alloy composition brought a notable difference in the alloys’ performance for the ORR. Pt40Dy60 electrode, i.e., the electrode with a lower amount of Pt, was identified to have a higher activity towards ORR as evidenced by lower overpotential and higher current densities under identical experimental conditions. Furthermore, DFT calculations point out the unique single-atom-like coordination and electronic structure of Pt atoms in the Pt40Dy60 surface as responsible for enhanced ORR activity compared to the alloy with a higher Pt content. Additionally, Pt–Dy alloys showed activity in the oxygen evolution reaction (OER), with the OER current density lower than that of pure Pt. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Mijailović, N. R.; Vesic, K.; Arsenijevic, D.; Milojević-Rakić, M.; Borovcanin, M. M.
Galectin-3 Involvement in Cognitive Processes for New Therapeutic Considerations Journal Article
In: Frontiers in Cellular Neuroscience, 16 , 2022.
@article{Mijailović2022b,
title = {Galectin-3 Involvement in Cognitive Processes for New Therapeutic Considerations},
author = {N. R. Mijailović and K. Vesic and D. Arsenijevic and M. Milojević-Rakić and M. M. Borovcanin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85134301711&doi=10.3389%2ffncel.2022.923811&partnerID=40&md5=e79c4942a24a519f6004a951b9dd89bd},
doi = {10.3389/fncel.2022.923811},
year = {2022},
date = {2022-01-01},
journal = {Frontiers in Cellular Neuroscience},
volume = {16},
abstract = {Cognitive impairment may be a consequence of the normal aging process, but it may also be the hallmark of various neurodegenerative and psychiatric diseases. Early identification of individuals at particular risk for cognitive decline is critical, as it is imperative to maintain a cognitive reserve in these neuropsychiatric entities. In recent years, galectin-3 (Gal-3), a member of the galectin family, has received considerable attention with respect to aspects of neuroinflammation and neurodegeneration. The mechanisms behind the putative relationship between Gal-3 and cognitive impairment are not yet clear. Intrigued by this versatile molecule and its unique modular architecture, the latest data on this relationship are presented here. This mini-review summarizes recent findings on the mechanisms by which Gal-3 affects cognitive functioning in both animal and human models. Particular emphasis is placed on the role of Gal-3 in modulating the inflammatory response as a fine-tuner of microglia morphology and phenotype. A review of recent literature on the utility of Gal-3 as a biomarker is provided, and approaches to strategically exploit Gal-3 activities with therapeutic intentions in neuropsychiatric diseases are outlined. Copyright © 2022 Mijailović, Vesic, Arsenijevic, Milojević-Rakić and Borovcanin.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Cognitive impairment may be a consequence of the normal aging process, but it may also be the hallmark of various neurodegenerative and psychiatric diseases. Early identification of individuals at particular risk for cognitive decline is critical, as it is imperative to maintain a cognitive reserve in these neuropsychiatric entities. In recent years, galectin-3 (Gal-3), a member of the galectin family, has received considerable attention with respect to aspects of neuroinflammation and neurodegeneration. The mechanisms behind the putative relationship between Gal-3 and cognitive impairment are not yet clear. Intrigued by this versatile molecule and its unique modular architecture, the latest data on this relationship are presented here. This mini-review summarizes recent findings on the mechanisms by which Gal-3 affects cognitive functioning in both animal and human models. Particular emphasis is placed on the role of Gal-3 in modulating the inflammatory response as a fine-tuner of microglia morphology and phenotype. A review of recent literature on the utility of Gal-3 as a biomarker is provided, and approaches to strategically exploit Gal-3 activities with therapeutic intentions in neuropsychiatric diseases are outlined. Copyright © 2022 Mijailović, Vesic, Arsenijevic, Milojević-Rakić and Borovcanin.
Adnaedvic, B. K.; Nikolic, I. R.; Milenkovic, S. A.; Jovanovic, J. D.
In: International Journal of Chemical Reactor Engineering, 20 (8), pp. 845-854, 2022.
@article{Adnaedvic2022845,
title = {The effect of operating parameters of hydrodynamic cavitation - Assisted alkaline catalyzed transesterification of sunflower oil with methanol on the degree of triglyceride conversion},
author = {B. K. Adnaedvic and I. R. Nikolic and S. A. Milenkovic and J. D. Jovanovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85122030769&doi=10.1515%2fijcre-2021-0131&partnerID=40&md5=35164f5ee60926d2c90b25779f3faa08},
doi = {10.1515/ijcre-2021-0131},
year = {2022},
date = {2022-01-01},
journal = {International Journal of Chemical Reactor Engineering},
volume = {20},
number = {8},
pages = {845-854},
abstract = {The effect of operating parameters such as reaction mixture inlet pressure p 1 (101.3-1013.2 kPa), methanol to oil molar ratio M 1 (3-12), the concentration of catalyst C c (0.0-1.0 wt%), temperature T (25-50 °C) and the number of passes of the reaction mixture through the venturi type hydrodynamic cavitation reactor n (1-12) on alkali-catalyzed transesterification of sunflower oil with methanol assisted by hydrodynamic cavitation (ACTC) on the value of the degree of triglyceride conversion (DTC) was investigated. ACTC was performed by the venturi-type hydrodynamic cavitation reactor (VCR) of our construction. It was found that the values of DTC increase with the increase in p 1, M 1, C c, and n, and decrease with the increase in T. Cavitation yield (CY) values were calculated. The ACTC was proved to be the simplest, fastest, and most highly energy-efficient current technology for the production of biodiesel. © 2021 Walter de Gruyter GmbH, Berlin/Boston.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effect of operating parameters such as reaction mixture inlet pressure p 1 (101.3-1013.2 kPa), methanol to oil molar ratio M 1 (3-12), the concentration of catalyst C c (0.0-1.0 wt%), temperature T (25-50 °C) and the number of passes of the reaction mixture through the venturi type hydrodynamic cavitation reactor n (1-12) on alkali-catalyzed transesterification of sunflower oil with methanol assisted by hydrodynamic cavitation (ACTC) on the value of the degree of triglyceride conversion (DTC) was investigated. ACTC was performed by the venturi-type hydrodynamic cavitation reactor (VCR) of our construction. It was found that the values of DTC increase with the increase in p 1, M 1, C c, and n, and decrease with the increase in T. Cavitation yield (CY) values were calculated. The ACTC was proved to be the simplest, fastest, and most highly energy-efficient current technology for the production of biodiesel. © 2021 Walter de Gruyter GmbH, Berlin/Boston.
Gezović, A.; Mišurović, J.; Milovanović, B.; Etinski, M.; Krstić, J.; Grudić, V.; Dominko, R.; Mentus, S.; Vujković, M. J.
High Al-ion storage of vine shoots-derived activated carbon: New concept for affordable and sustainable supercapacitors Journal Article
In: Journal of Power Sources, 538 , 2022.
@article{Gezović2022,
title = {High Al-ion storage of vine shoots-derived activated carbon: New concept for affordable and sustainable supercapacitors},
author = {A. Gezović and J. Mišurović and B. Milovanović and M. Etinski and J. Krstić and V. Grudić and R. Dominko and S. Mentus and M. J. Vujković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85129772583&doi=10.1016%2fj.jpowsour.2022.231561&partnerID=40&md5=20611447ccccae9851b72fbfb3f559b8},
doi = {10.1016/j.jpowsour.2022.231561},
year = {2022},
date = {2022-01-01},
journal = {Journal of Power Sources},
volume = {538},
abstract = {New era heteroatom-doped carbons, relying on different biomass residues, play a rising role in contemporary carbon energy storage technology. Herein, an abundant waste of viticulture industry – vine shoots (VS) was carbonized and examined as electrode material for supercapacitors with non-conventional aqueous electrolyte. Biochar obtained by pre-carbonization treatment of vine shoots (at 300 °C) is impregnated with ZnCl2 at 600 °C (ACvs600) and 700 °C (ACvs700), to synthesize carbon with developed specific surface area, close to 1500 m2 g−1. The high specific capacitance of ACvs is achieved in Al-based electrolyte, which allows working voltage of 1.8 V ACvs700/Al2(SO4)3/ACvs700 cell delivers the energy density of 24 Wh kg−1 at 1 A g−1, which is higher than one measured in typical Na2SO4 (∼16 Wh kg−1) and H2SO4 electrolyte (∼11 Wh kg−1). By using Trasatti&Dunn surface charge distribution models, the reallocation of inner vs. outer charge in Al-based electrolyte is found to be different from that in H2SO4 electrolyte. The nature of the interaction between pristine/defective graphene and hydrated Al3+ ion is examined by Density Functional Theory (DFT) and discussed. Gathered experimental and theoretical data open novel perspectives for using carbon in more sustainable energy storage devices. © 2022 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
New era heteroatom-doped carbons, relying on different biomass residues, play a rising role in contemporary carbon energy storage technology. Herein, an abundant waste of viticulture industry – vine shoots (VS) was carbonized and examined as electrode material for supercapacitors with non-conventional aqueous electrolyte. Biochar obtained by pre-carbonization treatment of vine shoots (at 300 °C) is impregnated with ZnCl2 at 600 °C (ACvs600) and 700 °C (ACvs700), to synthesize carbon with developed specific surface area, close to 1500 m2 g−1. The high specific capacitance of ACvs is achieved in Al-based electrolyte, which allows working voltage of 1.8 V ACvs700/Al2(SO4)3/ACvs700 cell delivers the energy density of 24 Wh kg−1 at 1 A g−1, which is higher than one measured in typical Na2SO4 (∼16 Wh kg−1) and H2SO4 electrolyte (∼11 Wh kg−1). By using Trasatti&Dunn surface charge distribution models, the reallocation of inner vs. outer charge in Al-based electrolyte is found to be different from that in H2SO4 electrolyte. The nature of the interaction between pristine/defective graphene and hydrated Al3+ ion is examined by Density Functional Theory (DFT) and discussed. Gathered experimental and theoretical data open novel perspectives for using carbon in more sustainable energy storage devices. © 2022 Elsevier B.V.
Živanović, A. S.; Bukonjić, A. M.; Jovanović-Stević, S.; Bogojeski, J.; Ćoćić, D.; Bijelić, A. P.; Ratković, Z. R.; Volarević, V.; Miloradović, D.; Tomović, D. L.; Radić, G. P.
In: Journal of Inorganic Biochemistry, 233 , 2022.
@article{Živanović2022,
title = {Complexes of copper(II) with tetradentate S,O-ligands: Synthesis, characterization, DNA/albumin interactions, molecular docking simulations and antitumor activity},
author = {A. S. Živanović and A. M. Bukonjić and S. Jovanović-Stević and J. Bogojeski and D. Ćoćić and A. P. Bijelić and Z. R. Ratković and V. Volarević and D. Miloradović and D. L. Tomović and G. P. Radić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130465709&doi=10.1016%2fj.jinorgbio.2022.111861&partnerID=40&md5=216e6b32434979076a68c1bf3e9d959e},
doi = {10.1016/j.jinorgbio.2022.111861},
year = {2022},
date = {2022-01-01},
journal = {Journal of Inorganic Biochemistry},
volume = {233},
abstract = {Four new complexes of copper(II) with S,O-tetradentate ligands, derivatives of thiosalicylic acid, encompassing an ethylene-, propylene-, butylene- and pentylene- bridge, were synthesized and characterized by microanalysis, molecular conductance and infrared (IR) spectra. The structures were assumed based on the previously mentioned analyses and confirmed with the results of electron paramagnetic resonance (EPR) spectra. The reactivity of complexes towards L-methionine (L-Met), L-cysteine (L-Cys) and guanosine-5′-monophosphate (5’-GMP) was also examined. Complex C1 ([Cu(S,O-ethylene-thiosalicylic acid)(H2O)2]) containing two inert methylene groups in the side chain of ligand shows the highest reactivity, while the least reactive is complex C4 ([Cu(S,O-pentylene-thiosalicylic acid)(H2O)2]) with five methylene groups. All complexes showed the highest reactivity towards L-Met and the lowest reactivity towards 5’-GMP. The interactions of complexes C1-C4 with calf thymus DNA (ct-DNA) were examined by ultraviolet-visible (UV–Vis) absorption and fluorescence spectral studies, revealing good DNA interaction abilities. All synthesized complexes C1-C4 show to interact with human serum albumin (HSA) with high values of binding constants. Complexes interaction with DNA/HSA was also confirmed using molecular docking simulations. All synthesized complexes reduce viability of human colon, breast and lung cancer cells, evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) colorimetric technique. The complex [Cu(S,O-pentylene- thiosalicylic acid)(H2O)2] showed the highest binding affinity constants to DNA/HSA and highest cytotoxicity, thus presenting a good candidate for further pharmacological research in the field of colon, breast and lung cancer therapy. © 2022 Elsevier Inc.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Four new complexes of copper(II) with S,O-tetradentate ligands, derivatives of thiosalicylic acid, encompassing an ethylene-, propylene-, butylene- and pentylene- bridge, were synthesized and characterized by microanalysis, molecular conductance and infrared (IR) spectra. The structures were assumed based on the previously mentioned analyses and confirmed with the results of electron paramagnetic resonance (EPR) spectra. The reactivity of complexes towards L-methionine (L-Met), L-cysteine (L-Cys) and guanosine-5′-monophosphate (5’-GMP) was also examined. Complex C1 ([Cu(S,O-ethylene-thiosalicylic acid)(H2O)2]) containing two inert methylene groups in the side chain of ligand shows the highest reactivity, while the least reactive is complex C4 ([Cu(S,O-pentylene-thiosalicylic acid)(H2O)2]) with five methylene groups. All complexes showed the highest reactivity towards L-Met and the lowest reactivity towards 5’-GMP. The interactions of complexes C1-C4 with calf thymus DNA (ct-DNA) were examined by ultraviolet-visible (UV–Vis) absorption and fluorescence spectral studies, revealing good DNA interaction abilities. All synthesized complexes C1-C4 show to interact with human serum albumin (HSA) with high values of binding constants. Complexes interaction with DNA/HSA was also confirmed using molecular docking simulations. All synthesized complexes reduce viability of human colon, breast and lung cancer cells, evaluated by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) colorimetric technique. The complex [Cu(S,O-pentylene- thiosalicylic acid)(H2O)2] showed the highest binding affinity constants to DNA/HSA and highest cytotoxicity, thus presenting a good candidate for further pharmacological research in the field of colon, breast and lung cancer therapy. © 2022 Elsevier Inc.
Vasić, M. M.; Simatović, I. S.; Radović, L.; Minić, D. M.
Influence of microstructure of composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy on the corrosion behavior in various environments Journal Article
In: Corrosion Science, 204 , 2022.
@article{Vasić2022b,
title = {Influence of microstructure of composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy on the corrosion behavior in various environments},
author = {M. M. Vasić and I. S. Simatović and L. Radović and D. M. Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85131056159&doi=10.1016%2fj.corsci.2022.110403&partnerID=40&md5=cd44deb12832f805a7667250c0b193bb},
doi = {10.1016/j.corsci.2022.110403},
year = {2022},
date = {2022-01-01},
journal = {Corrosion Science},
volume = {204},
abstract = {Thermal analysis of the composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy, in correlation with the XRD analysis of its individual sides, shows that the changes in phase composition induced by thermal treatment are followed by changes in microstructural parameters of the already present or newly formed phases in the alloy. These changes influence the corrosion behavior of the alloy in 0.5 M NaOH, NaCl and HCl solutions, according to the potentiodynamic polarization and EIS measurements. Beside the phase composition, the microstructure including crystal orientation and the state of the alloy surface is observed to have a significant role in the overall corrosion behavior. © 2022 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal analysis of the composite amorphous/nanocrystalline Fe72Ni8Si10B10 alloy, in correlation with the XRD analysis of its individual sides, shows that the changes in phase composition induced by thermal treatment are followed by changes in microstructural parameters of the already present or newly formed phases in the alloy. These changes influence the corrosion behavior of the alloy in 0.5 M NaOH, NaCl and HCl solutions, according to the potentiodynamic polarization and EIS measurements. Beside the phase composition, the microstructure including crystal orientation and the state of the alloy surface is observed to have a significant role in the overall corrosion behavior. © 2022 Elsevier Ltd
Žižić, M.; Stanić, M.; Aquilanti, G.; Bajuk-Bogdanović, D.; Branković, G.; Rodić, I.; Živić, M.; Zakrzewska, J.
Biotransformation of selenium in the mycelium of the fungus Phycomyces blakesleeanus Journal Article
In: Analytical and Bioanalytical Chemistry, 414 (20), pp. 6213-6222, 2022.
@article{Žižić20226213,
title = {Biotransformation of selenium in the mycelium of the fungus Phycomyces blakesleeanus},
author = {M. Žižić and M. Stanić and G. Aquilanti and D. Bajuk-Bogdanović and G. Branković and I. Rodić and M. Živić and J. Zakrzewska},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85132892905&doi=10.1007%2fs00216-022-04191-4&partnerID=40&md5=ca7748f851603f7d63d0505157c7e812},
doi = {10.1007/s00216-022-04191-4},
year = {2022},
date = {2022-01-01},
journal = {Analytical and Bioanalytical Chemistry},
volume = {414},
number = {20},
pages = {6213-6222},
abstract = {Biotransformation of toxic selenium ions to non-toxic species has been mainly focused on biofortification of microorganisms and production of selenium nanoparticles (SeNPs), while far less attention is paid to the mechanisms of transformation. In this study, we applied a combination of analytical techniques with the aim of characterizing the SeNPs themselves as well as monitoring the course of selenium transformation in the mycelium of the fungus Phycomyces blakesleeanus. Red coloration and pungent odor that appeared after only a few hours of incubation with 10 mM Se+4 indicate the formation of SeNPs and volatile methylated selenium compounds. SEM–EDS confirmed pure selenium NPs with an average diameter of 57 nm, which indicates potentially very good medical, optical, and photoelectric characteristics. XANES of mycelium revealed concentration-dependent mechanisms of reduction, where 0.5 mM Se+4 led to the predominant formation of Se–S-containing organic molecules, while 10 mM Se+4 induced production of biomethylated selenide (Se−2) in the form of volatile dimethylselenide (DMSe) and selenium nanoparticles (SeNPs), with the SeNPs/DMSe ratio rising with incubation time. Several structural forms of elemental selenium, predominantly monoclinic Se8 chains, together with trigonal Se polymer chain, Se8 and Se6 ring structures, were detected by Raman spectroscopy. Graphical abstract: [Figure not available: see fulltext.] © 2022, Springer-Verlag GmbH Germany, part of Springer Nature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Biotransformation of toxic selenium ions to non-toxic species has been mainly focused on biofortification of microorganisms and production of selenium nanoparticles (SeNPs), while far less attention is paid to the mechanisms of transformation. In this study, we applied a combination of analytical techniques with the aim of characterizing the SeNPs themselves as well as monitoring the course of selenium transformation in the mycelium of the fungus Phycomyces blakesleeanus. Red coloration and pungent odor that appeared after only a few hours of incubation with 10 mM Se+4 indicate the formation of SeNPs and volatile methylated selenium compounds. SEM–EDS confirmed pure selenium NPs with an average diameter of 57 nm, which indicates potentially very good medical, optical, and photoelectric characteristics. XANES of mycelium revealed concentration-dependent mechanisms of reduction, where 0.5 mM Se+4 led to the predominant formation of Se–S-containing organic molecules, while 10 mM Se+4 induced production of biomethylated selenide (Se−2) in the form of volatile dimethylselenide (DMSe) and selenium nanoparticles (SeNPs), with the SeNPs/DMSe ratio rising with incubation time. Several structural forms of elemental selenium, predominantly monoclinic Se8 chains, together with trigonal Se polymer chain, Se8 and Se6 ring structures, were detected by Raman spectroscopy. Graphical abstract: [Figure not available: see fulltext.] © 2022, Springer-Verlag GmbH Germany, part of Springer Nature.
Pagnacco, M. C.; Maksimović, J. P.; Nikolić, N. T.; Bogdanović, D. V. Bajuk; Kragović, M. M.; Stojmenović, M. D.; Blagojević, S. N.; Senćanski, J. V.
Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction Journal Article
In: Molecules, 27 (15), 2022.
@article{Pagnacco2022b,
title = {Indigo Carmine in a Food Dye: Spectroscopic Characterization and Determining Its Micro-Concentration through the Clock Reaction},
author = {M. C. Pagnacco and J. P. Maksimović and N. T. Nikolić and D. V. Bajuk Bogdanović and M. M. Kragović and M. D. Stojmenović and S. N. Blagojević and J. V. Senćanski},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136341810&doi=10.3390%2fmolecules27154853&partnerID=40&md5=bf82aed326d15d5d071ac2c8437ff47e},
doi = {10.3390/molecules27154853},
year = {2022},
date = {2022-01-01},
journal = {Molecules},
volume = {27},
number = {15},
abstract = {Indigo carmine is a commonly used industrial blue dye. To determine its concentration in a commercially available food dye composed of a mixture of indigo carmine and D-glucose, this paper characterizes it through (ATR, KBr) FTIR micro-Raman as well as UV/Vis and clock: Briggs–Rauscher (BR) oscillatory reaction methods. The indigo carmine was detected in the bulk food dye only by applying micro-Raman spectroscopy, indicating a low percentage of the indigo carmine present. This research provides an improvement in the deviations from the experimental Raman spectrum as calculated by the B97D/cc-pVTZ level of theory one, resulting in a better geometrical optimization of the indigo carmine molecule compared to data within the literature. The analytical curves used to determine indigo carmine concentrations (and quantities) in an aqueous solution of food dye were applied by means of UV/Vis and BR methods. BR yielded significantly better analytical parameters: 100 times lower LOD and LOQ compared to commonly used UV/Vis. The remarkable sensitivity of the BR reaction towards indigo carmine suggests that not only does indigo carmine react in an oscillatory reaction but also its decomposition products, meaning that the multiple oxidation reactions have an important role in the BR’s indigo carmine mechanism. The novelty of this research is the investigation of indigo carmine using a clock BR reaction, opening new possibilities to determine indigo carmine in other complex samples (pharmaceutical, food, etc.). © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Indigo carmine is a commonly used industrial blue dye. To determine its concentration in a commercially available food dye composed of a mixture of indigo carmine and D-glucose, this paper characterizes it through (ATR, KBr) FTIR micro-Raman as well as UV/Vis and clock: Briggs–Rauscher (BR) oscillatory reaction methods. The indigo carmine was detected in the bulk food dye only by applying micro-Raman spectroscopy, indicating a low percentage of the indigo carmine present. This research provides an improvement in the deviations from the experimental Raman spectrum as calculated by the B97D/cc-pVTZ level of theory one, resulting in a better geometrical optimization of the indigo carmine molecule compared to data within the literature. The analytical curves used to determine indigo carmine concentrations (and quantities) in an aqueous solution of food dye were applied by means of UV/Vis and BR methods. BR yielded significantly better analytical parameters: 100 times lower LOD and LOQ compared to commonly used UV/Vis. The remarkable sensitivity of the BR reaction towards indigo carmine suggests that not only does indigo carmine react in an oscillatory reaction but also its decomposition products, meaning that the multiple oxidation reactions have an important role in the BR’s indigo carmine mechanism. The novelty of this research is the investigation of indigo carmine using a clock BR reaction, opening new possibilities to determine indigo carmine in other complex samples (pharmaceutical, food, etc.). © 2022 by the authors.
Unterweger, C.; Ranzinger, M.; Duchoslav, J.; Piana, F.; Pasti, I.; Zeppetzauer, F.; Breitenbach, S.; Stifter, D.; Fürst, C.
Electrically Conductive Biocomposites Based on Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Wood-Derived Carbon Fillers Journal Article
In: Journal of Composites Science, 6 (8), 2022.
@article{Unterweger2022,
title = {Electrically Conductive Biocomposites Based on Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Wood-Derived Carbon Fillers},
author = {C. Unterweger and M. Ranzinger and J. Duchoslav and F. Piana and I. Pasti and F. Zeppetzauer and S. Breitenbach and D. Stifter and C. Fürst},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136838957&doi=10.3390%2fjcs6080228&partnerID=40&md5=7ab0a95b2a771cfe7ec0cdef57e70e43},
doi = {10.3390/jcs6080228},
year = {2022},
date = {2022-01-01},
journal = {Journal of Composites Science},
volume = {6},
number = {8},
abstract = {In this paper, biobased carbons were used as fillers in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). The mechanical and electrical properties of these 100% biocomposites were analyzed. First, biocarbons were prepared from wood dust and cellulose fibers using carbonization temperatures ranging 900–2300 °C. XRD revealed significant improvements of the graphitic structure with increasing temperatures for both precursors, with slightly higher ordering in wood-dust-based carbons. An increase of the carbon content with continuous removal of other elements was observed with increasing temperature. The carbonized cellulose fiber showed an accumulation of Na and O on the fiber surface at a carbonization temperature of 1500 °C. Significant degradation of PHBV was observed when mixed with this specific filler, which can, most probably, be attributed to this exceptional surface chemistry. With any other fillers, the preparation of injection-molded PHBV composites was possible without any difficulties. Small improvements in the mechanical performance were observed, with carbonized fibers being slightly superior to the wood dust analogues. Improvements at higher filler content were observed. These effects were even more pronounced in the electrical conductivity. In the range of 15–20 vol.% carbonized fibers, the percolation threshold could be reached, resulting in an electrical conductivity of 0.7 S/cm. For comparison, polypropylene composites were prepared using cellulose fibers carbonized at 2000 °C. Due to longer fibers retained in the composites, percolation could be reached in the range of 5–10 vol.%. The electrical conductivity was even higher compared to that of composites using commercial carbon fibers, showing a great potential for carbonized cellulose fibers in electrical applications. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, biobased carbons were used as fillers in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). The mechanical and electrical properties of these 100% biocomposites were analyzed. First, biocarbons were prepared from wood dust and cellulose fibers using carbonization temperatures ranging 900–2300 °C. XRD revealed significant improvements of the graphitic structure with increasing temperatures for both precursors, with slightly higher ordering in wood-dust-based carbons. An increase of the carbon content with continuous removal of other elements was observed with increasing temperature. The carbonized cellulose fiber showed an accumulation of Na and O on the fiber surface at a carbonization temperature of 1500 °C. Significant degradation of PHBV was observed when mixed with this specific filler, which can, most probably, be attributed to this exceptional surface chemistry. With any other fillers, the preparation of injection-molded PHBV composites was possible without any difficulties. Small improvements in the mechanical performance were observed, with carbonized fibers being slightly superior to the wood dust analogues. Improvements at higher filler content were observed. These effects were even more pronounced in the electrical conductivity. In the range of 15–20 vol.% carbonized fibers, the percolation threshold could be reached, resulting in an electrical conductivity of 0.7 S/cm. For comparison, polypropylene composites were prepared using cellulose fibers carbonized at 2000 °C. Due to longer fibers retained in the composites, percolation could be reached in the range of 5–10 vol.%. The electrical conductivity was even higher compared to that of composites using commercial carbon fibers, showing a great potential for carbonized cellulose fibers in electrical applications. © 2022 by the authors.
Dorontic, S.; Bonasera, A.; Scopelliti, M.; Markovic, O.; Bogdanović, D. Bajuk; Ciasca, G.; Romanò, S.; Dimkić, I.; Budimir, M.; Marinković, D.; Jovanovic, S.
In: Nanomaterials, 12 (15), 2022.
@article{Dorontic2022,
title = {Gamma-Ray-Induced Structural Transformation of GQDs towards the Improvement of Their Optical Properties, Monitoring of Selected Toxic Compounds, and Photo-Induced Effects on Bacterial Strains},
author = {S. Dorontic and A. Bonasera and M. Scopelliti and O. Markovic and D. Bajuk Bogdanović and G. Ciasca and S. Romanò and I. Dimkić and M. Budimir and D. Marinković and S. Jovanovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136923871&doi=10.3390%2fnano12152714&partnerID=40&md5=380f14a3d3170b313b00d860a83c1768},
doi = {10.3390/nano12152714},
year = {2022},
date = {2022-01-01},
journal = {Nanomaterials},
volume = {12},
number = {15},
abstract = {Structural modification of different carbon-based nanomaterials is often necessary to improve their morphology and optical properties, particularly the incorporation of N-atoms in graphene quantum dots (GQDs). Here, a clean, simple, one-step, and eco-friendly method for N-doping of GQDs using gamma irradiation is reported. GQDs were irradiated in the presence of the different ethylenediamine (EDA) amounts (1 g, 5 g, and 10 g) and the highest % of N was detected in the presence of 10 g. N-doped GQDs emitted strong, blue photoluminescence (PL). Photoluminescence quantum yield was increased from 1.45, as obtained for non-irradiated dots, to 7.24% for those irradiated in the presence of 1 g of EDA. Modified GQDs were investigated as a PL probe for the detection of insecticide Carbofuran (2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate) and herbicide Amitrole (3-amino-1,2,4-triazole). The limit of detection was 5.4 μmol L−1 for Carbofuran. For the first time, Amitrole was detected by GQDs in a turn-off/turn-on mechanism using Pd(II) ions as a quenching agent. First, Pd(II) ions were quenched (turn-off) PL of GQDs, while after Amitrole addition, PL was recovered linearly with Amitrole concentration (turn-on). LOD was 2.03 μmol L−1. These results suggest that modified GQDs can be used as an efficient new material for Carbofuran and Amitrole detection. Furthermore, the phototoxicity of dots was investigated on both Gram-positive and Gram-negative bacterial strains. When bacterial cells were exposed to different GQD concentrations and illuminated with light of 470 nm wavelength, the toxic effects were not observed. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Structural modification of different carbon-based nanomaterials is often necessary to improve their morphology and optical properties, particularly the incorporation of N-atoms in graphene quantum dots (GQDs). Here, a clean, simple, one-step, and eco-friendly method for N-doping of GQDs using gamma irradiation is reported. GQDs were irradiated in the presence of the different ethylenediamine (EDA) amounts (1 g, 5 g, and 10 g) and the highest % of N was detected in the presence of 10 g. N-doped GQDs emitted strong, blue photoluminescence (PL). Photoluminescence quantum yield was increased from 1.45, as obtained for non-irradiated dots, to 7.24% for those irradiated in the presence of 1 g of EDA. Modified GQDs were investigated as a PL probe for the detection of insecticide Carbofuran (2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate) and herbicide Amitrole (3-amino-1,2,4-triazole). The limit of detection was 5.4 μmol L−1 for Carbofuran. For the first time, Amitrole was detected by GQDs in a turn-off/turn-on mechanism using Pd(II) ions as a quenching agent. First, Pd(II) ions were quenched (turn-off) PL of GQDs, while after Amitrole addition, PL was recovered linearly with Amitrole concentration (turn-on). LOD was 2.03 μmol L−1. These results suggest that modified GQDs can be used as an efficient new material for Carbofuran and Amitrole detection. Furthermore, the phototoxicity of dots was investigated on both Gram-positive and Gram-negative bacterial strains. When bacterial cells were exposed to different GQD concentrations and illuminated with light of 470 nm wavelength, the toxic effects were not observed. © 2022 by the authors.
Milikić, J.; Knežević, S.; Stojadinović, S.; Alsaiari, M.; Harraz, F. A.; Santos, D. M. F.; Šljukić, B.
In: Nanomaterials, 12 (15), 2022.
@article{Milikić2022c,
title = {Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media},
author = {J. Milikić and S. Knežević and S. Stojadinović and M. Alsaiari and F. A. Harraz and D. M. F. Santos and B. Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85136943992&doi=10.3390%2fnano12152657&partnerID=40&md5=cdc4392f2cea0be60e1903319007d422},
doi = {10.3390/nano12152657},
year = {2022},
date = {2022-01-01},
journal = {Nanomaterials},
volume = {12},
number = {15},
abstract = {Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec−1, significantly lower than that for CuAg/rGO (184 mV dec−1), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm−2) than for CuAg/rGO (−1.74 mA cm−2). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm−2) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm−2). © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec−1, significantly lower than that for CuAg/rGO (184 mV dec−1), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm−2) than for CuAg/rGO (−1.74 mA cm−2). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm−2) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm−2). © 2022 by the authors.
Jevtović, V.; Hamoud, H.; Al-Zahrani, S.; Alenezi, K.; Latif, S.; Alanazi, T.; Abdulaziz, F.; Dimić, D.
In: Molecules, 27 (15), 2022.
@article{Jevtović2022b,
title = {Synthesis, Crystal Structure, Quantum Chemical Analysis, Electrochemical Behavior, and Antibacterial and Photocatalytic Activity of Co Complex with Pyridoxal-(S-Methyl)-isothiosemicarbazone Ligand},
author = {V. Jevtović and H. Hamoud and S. Al-Zahrani and K. Alenezi and S. Latif and T. Alanazi and F. Abdulaziz and D. Dimić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85137012364&doi=10.3390%2fmolecules27154809&partnerID=40&md5=f9c7d349a8b08e99fb4513cfac71020b},
doi = {10.3390/molecules27154809},
year = {2022},
date = {2022-01-01},
journal = {Molecules},
volume = {27},
number = {15},
abstract = {New complex Co(III) with ligand Pyridoxal-S-methyl-isothiosemicarbazone, (PLITSC) was synthesized. X-ray analysis showed the bis-ligand octahedral structure of the cobalt complex [Co(PLITSC-H)2]BrNO3·CH3OH (compound 1). The intermolecular interactions governing the crystal structure were described by the Hirsfeld surface analysis. The structure of compound 1 and the corresponding Zn complex (([Zn(PLTSC)(H2O)2]SO4·H2O)) were optimized at the B3LYP/6–31 + G (d,p)/LanL2DZ level of theory, and the applicability was assessed by comparison with the crystallographic structure. The natural bond orbital analysis was used for the discussion on the stability of formed compounds. The antibacterial activity of obtained complexes towards S. aureus and E. coli was determined, along with the effect of compound 1 on the formation of free radical species. Activity of compound 1 towards the removal of methylene blue was also investigated. The voltammograms of these compounds showed the reduction of metal ions, as well as the catalyzed reduction of CO2 in acidic media. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
New complex Co(III) with ligand Pyridoxal-S-methyl-isothiosemicarbazone, (PLITSC) was synthesized. X-ray analysis showed the bis-ligand octahedral structure of the cobalt complex [Co(PLITSC-H)2]BrNO3·CH3OH (compound 1). The intermolecular interactions governing the crystal structure were described by the Hirsfeld surface analysis. The structure of compound 1 and the corresponding Zn complex (([Zn(PLTSC)(H2O)2]SO4·H2O)) were optimized at the B3LYP/6–31 + G (d,p)/LanL2DZ level of theory, and the applicability was assessed by comparison with the crystallographic structure. The natural bond orbital analysis was used for the discussion on the stability of formed compounds. The antibacterial activity of obtained complexes towards S. aureus and E. coli was determined, along with the effect of compound 1 on the formation of free radical species. Activity of compound 1 towards the removal of methylene blue was also investigated. The voltammograms of these compounds showed the reduction of metal ions, as well as the catalyzed reduction of CO2 in acidic media. © 2022 by the authors.
Milikić, J.; Fuentes, R. O.; Tasca, J. E.; Santos, D. M. F.; Šljukić, B.; Figueiredo, F. M. L.
Nickel-Doped Ceria Bifunctional Electrocatalysts for Oxygen Reduction and Evolution in Alkaline Media Journal Article
In: Batteries, 8 (8), 2022.
@article{Milikić2022,
title = {Nickel-Doped Ceria Bifunctional Electrocatalysts for Oxygen Reduction and Evolution in Alkaline Media},
author = {J. Milikić and R. O. Fuentes and J. E. Tasca and D. M. F. Santos and B. Šljukić and F. M. L. Figueiredo},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85137340400&doi=10.3390%2fbatteries8080100&partnerID=40&md5=9c47bdd88671a5aa6c2e4db22ecf0116},
doi = {10.3390/batteries8080100},
year = {2022},
date = {2022-01-01},
journal = {Batteries},
volume = {8},
number = {8},
abstract = {Nickel-doped ceria (Ce1−xNixO2−δ) nanopowders (7 to 5 nm in size) synthesized by the cation complexation method with 5, 10, 15, and 20 Ni at.% are studied with respect to their electrochemical activity for the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline medium. One finds good bifunctional electrocatalytic activity of the four Ce1−xNixO2−δ electrocatalysts. The Tafel analysis of the ORR in the 0.57–0.78 V vs. RHE potential window leads to slopes in the 70–108 mV dec−1 range. The number of electrons exchanged during ORR is between 2 and 2.7. The OER Tafel slopes are determined to be in the range 192 –281 mV dec−1. OER activation energies are found to range between 28 and 43 kJ mol−1. The specific capacitance of Ce1−xNixO2−δ electrocatalysts measured at a scan rate of 100 mV s−1 varies between 0.7 and 1.4 Fg−1. The results demonstrate that Ce1−xNixO2−δ nanopowders can act as bifunctional electrocatalysts for ORR/OER for potential application in the oxygen electrode of devices such as rechargeable metal–air batteries. © 2022 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nickel-doped ceria (Ce1−xNixO2−δ) nanopowders (7 to 5 nm in size) synthesized by the cation complexation method with 5, 10, 15, and 20 Ni at.% are studied with respect to their electrochemical activity for the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline medium. One finds good bifunctional electrocatalytic activity of the four Ce1−xNixO2−δ electrocatalysts. The Tafel analysis of the ORR in the 0.57–0.78 V vs. RHE potential window leads to slopes in the 70–108 mV dec−1 range. The number of electrons exchanged during ORR is between 2 and 2.7. The OER Tafel slopes are determined to be in the range 192 –281 mV dec−1. OER activation energies are found to range between 28 and 43 kJ mol−1. The specific capacitance of Ce1−xNixO2−δ electrocatalysts measured at a scan rate of 100 mV s−1 varies between 0.7 and 1.4 Fg−1. The results demonstrate that Ce1−xNixO2−δ nanopowders can act as bifunctional electrocatalysts for ORR/OER for potential application in the oxygen electrode of devices such as rechargeable metal–air batteries. © 2022 by the authors.