Search academic texts

Information × Registration Number 0220U104296, 0120U100725 , R & D reports Title Development of redox-active nanomaterials with controlled pro-/antioxidant activity based on oxide nanocrystals. popup.stage_title Head Seminko Vladyslav V., Кандидат фізико-математичних наук Registration Date 16-12-2020 Organization Institute for scintillation materials NAS Ukraine popup.description2  During the first stage of the project we have obtained CeO2-х nanocrystals with different sizes, nanocrystals of mixed oxides CeO2-Re2O3 (where Re = Y, Eu, Tb), CeO2-ZrO2, and MeVO4:Eu3+ (Me = Y, Gd) nanocrystals. The key role of Ce3+-Vo-Ce3+ (or Ce3+-Vo-Re3+) complexes and Ce3+/Ce4+ ratio in formation of anti-/prooxidant activity of cerium oxide nanocrystals was shown. Sufficient improvement of antiradical activity was shown for mixed CeO2 - Re2O3 (Re = Y, Eu, Tb), CeO2-ZrO2, and pre-irradiated cerium oxide nanocrystals. Variation of pH of colloidal solutions allows controlling the type of redox-activity of cerium oxide nanocrystals, at low (<5,5) pH values prooxidant activity dominates over antioxidant one. UV pre-irradiated water solutions of GdYVO4:Eu3+ nanocrystals demonstrate effective oxidation of ascorbic acid and lipids by reactive oxygen species formed during interaction of water and oxygen molecules with defect-captured electrons and holes accumulated at irradiation of nanocrystals, while the same nanocrystals stored in the dark for several days show strong antioxidant activity. Product Description popup.authors Grygorova Ganna V. Hubenko Kateryna О. Maksimchuk Pavlo О. popup.nrat_date 2020-12-15 Close