Adsorption in sparse networks II. Silica aerogels

George W. Scherer, Sylvie Calas, Robert Sempéré

Research output: Contribution to journalArticle

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Abstract

The model developed in Part I is applied to nitrogen adsorption isotherms obtained for a series of silica aerogels whose densities are varied by partial sintering. The isotherms are adequately described by a cubic network model, with all of the pores falling in the mesopore range; the adsorption and desorption branches are fit by the same pore size distribution. For the least dense gels, a substantial portion of the pore volume is not detected by condensation. The model attributes this effect to the shape of the adsorbate/adsorptive interface, which can adopt zero curvature even in mesopores, because of the shape of the network.

Original languageEnglish (US)
Pages (from-to)411-416
Number of pages6
JournalJournal of Colloid And Interface Science
Volume202
Issue number2
DOIs
StatePublished - Jun 15 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Keywords

  • Adsorption
  • Aerogel
  • Condensation
  • Curvature
  • Network
  • Silica
  • Sintering

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