Measurement of permeability II. Silica gel

George W. Scherer, Rose M. Swiatek

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The permeability (D) of alkoxide-derived silica gel is measured by establishing a pressure gradient in the pore liquid in a thin (∼ 2 mm) sheet of gel. In these experiments, the layers were thin enough to minimize the viscoelastic effects discussed in Part I. For an acid-catalyzed gel (A) with a homogeneous microstructure, the order of magnitude of D is found to be in agreement with the Carman-Kozeny equation. For a base-catalyzed gel (B2) D is larger than predicted, presumably because of relatively large pores in the inhomogeneous network. The permeability drops by ∼ 2 orders of magnitude when the layers are partially dried.

Original languageEnglish (US)
Pages (from-to)119-129
Number of pages11
JournalJournal of Non-Crystalline Solids
Issue number2-3
StatePublished - Dec 4 1989

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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