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

0543960 - ÚJF 2022 RIV US eng J - Journal Article
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
R&D Projects: GA MŠMT LM2015056
Research Infrastructure: CANAM II - 90056; Reactors LVR-15 and LR-0 II - 90120
Institutional support: RVO:61389005
Keywords : titania * silica * mesostructure * porous materials * fractal properties
OECD category: Materials engineering
Impact factor: 1.667, year: 2021
Method of publishing: Limited access
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.
Permanent Link: http://hdl.handle.net/11104/0321048