%0 Journal Article
%A Khodan, A. N.
%A Kopitsa, G. P.
%A Yorov, Kh. E.
%A Baranchikov, A. E.
%A Ivanov, V. K.
%A Feoktystov, Artem
%A Pipich, Vitaliy
%T Structural Analysis of Aluminum Oxyhydroxide Aerogel by Small Angle X-Ray Scattering
%J Journal of surface investigation
%V 12
%N 2
%@ 1819-7094
%C Moscow
%I MAIK Nauka/Interperiodics Publ.
%M FZJ-2018-02759
%P 296 - 305
%D 2018
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000430991000017
%R 10.1134/S102745101802026X
%U https://juser.fz-juelich.de/record/845525