Structure and self-similarity of silica aerogels

descriptionPublicationkeyboard_double_arrow_right Article 15 Apr 1988 English Publisher:American Physical Society (APS)Journal:Physical Review B, volume 37, pages 6,500-6,503 (issn: 0163-1829,

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Authors: , Vacher; , Woignier; , Pelous; , Courtens;

doi: 10.1103/physrevb.37.6500

pmid: 9943900

Structure and self-similarity of silica aerogels

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Abstract

Small-angle neutron scattering from silica aerogels reveals that they form mutually self-similar volume fractals for a wide range of densities and preparations. The fractal dimension is D=2.40\ifmmode\pm\else\textpm\fi{}0.03. The fractal behavior extends down to near-molecular sizes. Indication for a volume-to-surface fractal crossover is also obtained. These results apply to neutrally prepared or acid-catalyzed materials. Base-catalyzed gels have widely different properties.

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