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1 results

  • Effect of Clay Charge on Swelling: A Clay-Modified Electrode Study

  • Alanah Fitch, Jia Du, Huamin Gan, J. W. Stucki
  • Journal:
    Clays and Clay Minerals / Volume 43 / Issue 5 / October 1995
    Published online by Cambridge University Press:
    28 February 2024, pp. 607-614
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  • The uniformity of clay films affects the transport of an anionic electroactive probe through the film. When cations other than Na+ are present in the initial swelling of the film (such as native K+ and Ca2+), or when the native clay is highly charged, internal dislocations of the film, caused by variable stacking domains, enhance the diffusive transport of Fe(CN)63− across the film. This effect is investigated using clay-modified electrodes in which the clays are of variable exchange forms (Na+, Ca2+, or K+) and variable charge. The charge on the clay is determined both by the native form of the clay and by reduction of structural Fe3+. The results suggest that swelling of clays increases in a linear fashion with CEC, at least for minimally charged clays.