Effect of different reaction solvents on the hydrophobic and structural properties of silica cryogels

Li Fen Su, Lei Miao, Sakae Tanemura, Gang Xu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The experimental results on the microstructural and physical properties of the TEOS-based silica cryogels have been reported. The cryogels were produced by two-step sol-gel process followed by vacuum freeze drying. The wet gels were synthesized via acid-base catalysis using tetraethoxysilane (TEOS) as a silica precursor, the different solvents containing ethanol (EtOH), methanol (MeOH) and tert-butanol (TBA), the molar ratio of TEOS / solvent were varied from 1:6 to 1:13. Further, the microstructure and specific surface area of the cryogels were analysed by Scanning Electron Microscopy (SEM) and nitrogen absorption/desorption isotherms. The hydrophobicity of the cryogels was studied by contact angle. It was found that the highest specific surface area (1040.17 m2/g) was obtained with the solvent of MeOH. The lowest density (0.074 g/cm3) was acquired with the solvent of EtOH.

Original languageEnglish
Title of host publicationOptoelectronic Materials
EditorsYuan Ming Huang
PublisherTrans Tech Publications Ltd
Pages1238-1241
Number of pages4
ISBN (Print)0878492119, 9780878492114
DOIs
Publication statusPublished - 2011
Externally publishedYes

Publication series

NameMaterials Science Forum
Volume663-665
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Keywords

  • Silica cryogels
  • Solvents
  • Vacuum freeze drying

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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