The microstructure of hybrid silica gels and its modification by evaporative and supercritical dryings

Cédric J. Gommes, Silvia Blacher, Jean Paul Pirard, George W. Scherer

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The effect of evaporative drying on the pore size of two series of hybrid silica gels is investigated by combining beam bending on the gels and mercury porosimetry on the aerogels and xerogels with transmission electron microscopy on the xerogels. It is shown that the shrinkage of the pores during drying is different in the two series: in one series the pores shrink proportionally to their volume, in the other the pores collapse until they all reach the same size. The experimental data enable us to discuss the relation between these two different behaviours and the different morphology of the two series of gels.

Original languageEnglish (US)
Pages (from-to)211-218
Number of pages8
JournalJournal of Sol-Gel Science and Technology
Volume44
Issue number3
DOIs
StatePublished - Dec 1 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

Keywords

  • Aerogels
  • Beam-bending
  • Drying
  • Gels
  • Hybrid materials
  • Xerogels

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