WATER VAPOR-SODIUM MONTMORILLONITE INTERACTION

The interaction of water vapor with sodium montmorillonite was investigated with X-ray diffraction and sorption isotherm (gravimetric method) experiments. Expansion of the montmorillonite occurs in three increments. The data suggest that interlayer water builds up in a laminar fashion. The hysteresis of adsorption isotherms is apparently due to the formation of a thixotropic structure and to attractive interlayer forces. BET parameters from adsorption isotherm data reflect adsorption only on external surfaces. Free energy data, computed from adsorption isotherm data and X-ray data, allow separation of the free energy change on adsorption into two components: one for adsorption on external surfaces, and one for adsorption on, and separation of, internal surfaces. The data also permit the estimation of swelling pressures exerted by sodium montmorillonite due to the uptake of interlayer water from the vapor phase. /Author/

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  • Supplemental Notes:
    • Paper sponsored by Committee on Physico-Chemical Phenomena in Soils and presented at the 45th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
  • Authors:
    • Roderick, G L
    • Demirel, Turgut
  • Publication Date: 1966

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 45-67
  • Monograph Title: Frost, physical properties and stabilization
  • Serial:

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Filing Info

  • Accession Number: 00263613
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jan 9 1975 12:00AM