Journal of Inorganic Materials ›› 2015, Vol. 30 ›› Issue (12): 1243-1253.doi: 10.15541/jim20150223

• Orginal Article • Previous Articles     Next Articles

An Overview on Silica Aerogels Synthesized by Siloxane Co-precursors

Fei HE1,2(), Wan-Jun YU1,2, Min-Han FANG1,2, Xiao-Dong HE1,2, Ming-Wei LI3()   

  1. 1. Key Laboratory of Science and Technology on Advanced Composites, Harbin Institute of Technology, Harbin 150001, China
    2. Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China
    3. Key Laboratory for Precision Hot Processing of Materials, Harbin Institute of Technology, Harbin Institute of Technology, Harbin 150001, China
  • Received:2015-05-11 Revised:2015-06-10 Online:2015-12-20 Published:2015-11-24
  • About author:HE Fei. E-mail: hefei@hit.edu.cn
  • Supported by:
    Key Laboratory Opening Funding of Key Laboratory of Science and Technology on Advanced Composites (9140C490208140C49003)

Abstract:

Due to their unique features, such as high specific surface area, high porosity, low density, low thermal conductivity, and high transmittance, aerogels can be widely applied in the fields of thermal insulation, sound insulation and optics. However, aerogels usually tend to be destructive collapse, due to their porous structures constituted by slightly brittle skeletons, which is a negative factor to restrict their applications. According to the number and variety of non-hydrolytic groups in siloxane precursors, an overview of the literatures is presented on silica aerogels synthesized by three kinds of siloxane co-precursors, i.e. integral hydrolytic co-precursors, integral/partial and partial hydrolytic co-precursors. The characteristics of porous structures and properties in mechanics, thermal insulation, optics, and hydrophobicity are analyzed. It is an effective method by choosing appropriate precursors to realize the designs and improve mechanical behaviors of aerogels in respect of structures and properties.

Key words: silica aerogels, siloxane co-precursors, mechanical properties, Sol-Gel method, review

CLC Number: 

  • TB303