SiO2-TiO2 Binary Aerogels: A Small-Angle Scattering Study

0543960 - ÚJF 2022 RIV US eng J - Článek v odborném periodiku
Baranchikov, A. E. - Kopitsa, G. P. - Yorov, K. E. - Sipyagina, N. A. - Lermontov, S. A. - Pavlova, A. A. - Kottsov, S. Y. - Garamus, V. M. - Ryukhtin, Vasil - Ivanov, V. K.
SiO2-TiO2 Binary Aerogels: A Small-Angle Scattering Study.
Russian Journal of Inorganic Chemistry. Roč. 66, č. 6 (2021), s. 874-882. ISSN 0036-0236. E-ISSN 1531-8613
Grant CEP: GA MŠMT LM2015056
Výzkumná infrastruktura: CANAM II - 90056; Reactors LVR-15 and LR-0 II - 90120
Institucionální podpora: RVO:61389005
Klíčová slova: titania * silica * mesostructure * porous materials * fractal properties
Obor OECD: Materials engineering
Impakt faktor: 1.667, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1134/S003602362106005X

Structural analysis in the range of characteristic sizes from 1 nm to similar to 1.5 mu m was performed for SiO2-TiO2 aerogels prepared in supercritical CO2, isopropanol, hexafluoroisopropanol, or methyl-tert-butyl ether using small-angle X-ray scattering and neutron scattering complementary methods. A two-level model that accounts for scattering by individual inhomogeneities and their aggregates, which have fractal properties, satisfactorily describes the aerogel structures over the entire range of scales. It is shown for the first time that the titania concentration is the key factor in the small-angle neutron and X-ray scattering by SiO2-TiO2 aerogels. The phase composition of an aerogel does not significantly affect the aerogel structure in the range of scales from 1 nm to similar to 1.5 mu m, as probed by small-angle X-ray and neutron scattering.
Trvalý link: http://hdl.handle.net/11104/0321048