Search academic texts

Information × Registration Number 0221U106983, 0121U113851 , R & D reports Title Oxide nanobelts formation under stirring – experiment, theory, applications popup.stage_title Head Husak Andrii M., Доктор фізико-математичних наук Registration Date 23-12-2021 Organization Bohdan Khmelnytsky National University of Cherkasy popup.description2 The object of research is anisotropic nanostructures of oxides. Subject of research - conditions and kinetics of formation of nanofiber structures of metal oxides. Purpose: Systematic study of the new method of production of nanobands of oxides by intensive mixing of aqueous solutions. Results: 1) For the first time in Ukraine, vanadium pentoxide nanobands were obtained by intensive mixing of aqueous solutions of the original powder. 2) Two alternative devices for the synthesis of vanadium pentoxide nanobands with feedback to stabilize the mixing rate have been designed. 3) The obtained nanobelts were investigated by scanning and transmission electron microscopy. 4) The correlation of the evolution of vanadium pentoxide nanofibers ensembles with the evolution of pH-index and viscosity of the suspension is established. 5) An unusual current-voltage characteristic of the pressed vanadium pentoxide nanofibers was detected (with reaching of the asymptote of the current with increasing voltage). 6) For the first time it became possible to describe the process of formation of elongated nanostructures in the framework of a new phenomenological theory of recrystallization taking into account additional anisotropic ballistic (non-thermal) frequencies of erosion of different faces during intensive mixing. 7) There are two possible causes of anisotropic growth of elongated particles: (1) large anisotropy of kinetic factors of growth / dissolution in different directions, (2) anisotropy of ballistic members. 8) The process of obtaining V2O5 nanobands is sharply accelerated by intensive mixing, which provides (1) higher (nonequilibrium) concentration of VO3- and VO2 + ions in water, (2) faster movement of ions between the faces of the same and different particles, (3) additional ballistic (athermal) erosion - anisotropic detachments of atoms from different faces. Product Description popup.authors Gusak Andrii M. Kolomiets Denys I. Korol Yaroslav D. Pasichnyy Mykola O. popup.nrat_date 2021-12-23 Close