Structure and Morphology Evolution of Silica-Modified Pseudoboehmite Aerogels During Heat Treatment Full article
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Journal of Solid State Chemistry
ISSN: 0022-4596 , E-ISSN: 1095-726X |
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| Output data | Year: 2016, Volume: 233, Pages: 294-302 Pages count : 9 DOI: 10.1016/j.jssc.2015.11.007 | ||||||
| Tags | 2D crystallites, Alumina, Debye Scattering Equation, Nanostructure, Pseudoboehmite, Supercritical drying | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Skolkovo Foundation | 3 от 25.12.2014 |
| 2 | Russian Science Foundation | 14-23-00037 |
Abstract:
Silica-modified pseudoboehmite aerogels (0, 10, 20 at % of Si) were prepared by sol-gel method followed by supercritical drying. The phase transformations, changes in structure and morphology upon calcination were thoroughly investigated by advanced X–Ray diffraction (XRD) techniques and high-resolution transmission electron microscopy (HRTEM). Obtained pseudoboehmite samples had specific nanostructure: ultrathin two-dimensional (2D) crystallites were loosely packed. The silica dopant drastically enhanced the crystallite anisotropy. Thus, the aerogel with Al:Si atomic ratio of 9:1 consisted of the pseudoboehmite nanosheets with thickness of one unit cell (average dimensions of 14.0х1.2x14.5 nm). The specific nanostructure caused remarkable features of experimental XRD patterns, including anisotropic peak broadening and appearance of forbidden reflection. Direct simulation of XRD patterns with using the Debye Scattering Equation allowed the size and morphology of pseudoboehmite crystallites to be determined. The silica addition strongly delayed formation of γ-alumina and further phase transformations upon calcinaton. Thermal stability of alumina was suggested to be affected by the particle morphology inherited from the pseudoboehmite precursor.
Cite:
Pakharukova V.P.
, Shalygin A.S.
, Gerasimov E.Y.
, Tsybulya S.V.
, Martyanov O.N.
Structure and Morphology Evolution of Silica-Modified Pseudoboehmite Aerogels During Heat Treatment
Journal of Solid State Chemistry. 2016. V.233. P.294-302. DOI: 10.1016/j.jssc.2015.11.007 WOS Scopus РИНЦ ANCAN OpenAlex
Structure and Morphology Evolution of Silica-Modified Pseudoboehmite Aerogels During Heat Treatment
Journal of Solid State Chemistry. 2016. V.233. P.294-302. DOI: 10.1016/j.jssc.2015.11.007 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Aug 18, 2015 |
| Accepted: | Nov 3, 2015 |
| Published online: | Nov 4, 2015 |
| Published print: | Jan 1, 2016 |
Identifiers:
| Web of science: | WOS:000369881200042 |
| Scopus: | 2-s2.0-84946545409 |
| Elibrary: | 24934779 |
| Chemical Abstracts: | 2015:1806910 |
| Chemical Abstracts (print): | 163:707453 |
| OpenAlex: | W1950576901 |