MIGRATION OF INTERLAMELLAR WATER DURING FREEZING AND THAWING OF WYOMING BENTONITE

Homoionic, clay-water pastes of Wyoming bentonite were studied at near freezing temperatures by X-ray diffraction. On freezing, the initial high d(001) spacings of the lithium- and sodium-bentonite pastes decreased, first to about 19A and at about -10 C to 16A. When the temperature was raised the d(001) spacings of the frozen clays increased substantially; on melting, the d(001) spacings quickly expanded to their initial high values. The behavior of the hydrogen-aluminum-, potassium-, and calcium-bentonite was similar except that spacings greater than about 20A did not occur. All the normally observed diffraction maxima of ordinary ice were present after lattice cllapse. No anomalous diffraction maxima suggesting lattice collapse. No anomalous diffraction maxima suggesting structure were detected. Evidently, when bentonite-water pastes are frozen all but two or three monomolecular layers of the interlamellar water migrates into the pore space to form ordinary ice. The remaining interlamellar water therefore must correspond to the "unfrozen" water of previous investigations.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 498-503
  • Serial:
    • Volume: 29
    • Issue Number: 5

Subject/Index Terms

Filing Info

  • Accession Number: 00264667
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 29 1975 12:00AM