Journal of Sol-Gel Science and Technology

, Volume 58, Issue 2, pp 470–475

Fabrication of gradient density SiO2 aerogel

  • Jia-Yin Gui
  • Bin Zhou
  • Yan-Hong Zhong
  • Ai Du
  • Jun Shen
Original Paper

DOI: 10.1007/s10971-011-2415-x

Cite this article as:
Gui, JY., Zhou, B., Zhong, YH. et al. J Sol-Gel Sci Technol (2011) 58: 470. doi:10.1007/s10971-011-2415-x

Abstract

With tetraethoxysilane as the organic precursor, gradient density aerogels were fabricated by three different methods: layer-by-layer gelation, sol-co-gelation and continuous formation technics. Through layer-by-layer method, a 5-layer graded density silica aerogel whose density ranges from 50 to 200 mg/cm3 was obtained, but it existed a dense skin between adjacent layers which could result in density mutation in the interface. In order to optimize its interface character, sol-co-gelation technique was created to improve the interdiffusion and smooth out the density mutation via a self-built device. Finally, on the base of the device and sol-co-gelation technics, a continuous formation process was developed to fabricate the completely gradient density silica aerogel. Optical microscope and X-ray phase contrast method were used to characterize the samples prepared by three different technics and comparatively research their interface feature.

Keywords

Gradient density Layer-by-layer gelation Sol-co-gelation Interdiffusion Continuous formation 

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Jia-Yin Gui
    • 1
    • 2
  • Bin Zhou
    • 1
    • 2
  • Yan-Hong Zhong
    • 1
    • 2
  • Ai Du
    • 1
    • 2
  • Jun Shen
    • 1
    • 2
  1. 1.Department of PhysicsTongji University ShanghaiChina
  2. 2.Shanghai Key Laboratory of Special Microstructure Materials and TechnologyTongji UniversityShanghaiChina

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