Open AccessSTUDY ON FRACTAL STRUCTURE OF POROUS SILICA:AEROGELS AND XEROGELS
Author(s) -
Jun Shen,
Jue Wang,
Xiang Wu
Publication year - 1996
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.45.1501
Subject(s) - materials science , aerogel , porosity , fractal , sol gel , intensity (physics) , chemical engineering , power law , scattering , composite material , optics , nanotechnology , mathematical analysis , statistics , physics , mathematics , engineering
Porous materials silica aerogels and xerogels were obtained through a sol-gel process from TEOS. Samples derived from different preparation circumstances were investigated via small-angle X-ray scattering. The power-law dependence of the scattered intensity, a characteristic of fractal structures, was observed for all the one-step aerogels. While for the xerogels and aerogels derived from a two-step sol-gel process, the power-law dependence of the scattered intensity was not observed. The xerogels are found to consist of a number of large spherical particles which were densely packed together.