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024 7 _ |a 1819-7094
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037 _ _ |a FZJ-2018-02759
082 _ _ |a 530
100 1 _ |a Khodan, A. N.
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245 _ _ |a Structural Analysis of Aluminum Oxyhydroxide Aerogel by Small Angle X-Ray Scattering
260 _ _ |a Moscow
|c 2018
|b MAIK Nauka/Interperiodics Publ.
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520 _ _ |a The work presents studies on the microstructure and mesostructure of nanostructured aluminum oxyhydroxide formed as a high porous monolithic material through the surface oxidation of aluminum liquidmetal solution in mercury in a temperature- and humidity-controlled air atmosphere. The methods of X-ray diffraction analysis, thermal analysis, the low temperature adsorption of nitrogen vapors, transmission electron microscopy, small-angle and very small-angle neutron scattering, and small-angle X-ray scattering are used for comprehensive investigation of the samples synthesized at 25°С as well as that annealed at temperatures up to 1150°C. It is found that the structure of the monolithic samples can be described within the framework of a three-level model involving primary heterogeneities (typical length scale of rc ≈ 9–19 Å), forming fibrils (cross-sectional radius R ≈ 36–43 Å and length L ≈ 3200–3300 Å) or lamellae (thickness T ≈ 110 Å and width W ≈ 3050 Å) which, in turn, are integrated into large-scale aggregates (typical size R c ≈ 1.25–1.4 μm) with an insignificant surface roughness. It is shown that a high specific surface (~200 m2/g) typical for the initial sample is maintained upon its thermal annealing up to 900°С, and it decreases to 100 m2/g after heat treatment at 1150°С due to fibrillary agglomeration.
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Kopitsa, G. P.
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700 1 _ |a Yorov, Kh. E.
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700 1 _ |a Baranchikov, A. E.
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700 1 _ |a Ivanov, V. K.
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700 1 _ |a Feoktystov, Artem
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700 1 _ |a Pipich, Vitaliy
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773 _ _ |a 10.1134/S102745101802026X
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