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Calorimetric study of water adsorption on saponite

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Abstract

The isotherms and differential heats of water vapor adsorption on Na- and Ca-saponite samples are measured. It is shown that the successive stages of hydration of the internal surface of this mineral appear as waves or inflections in the adsorption isotherms and maxima in the dependences of the differential heat on the adsorption value. The compositions of Na+ and Ca2+ aquacations in single- and double-layer saponite hydrates are determined. The heats of interaction between water molecules and interlayer Na+ cations in single-layer saponite hydrates and between Na+ cations and the ion exchanger matrix are estimated.

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Authors and Affiliations

  1. Dumanskii Institute of Colloid and Water Chemistry, National Academy of Sciences of Ukraine, bul’v. Akademika Vernadskogo 42, Kyiv, 03680, Ukraine

    Yu. I. Tarasevich & V. E. Polyakov

Authors
  1. Yu. I. Tarasevich
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  2. V. E. Polyakov
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Correspondence to Yu. I. Tarasevich.

Additional information

Original Russian Text © Yu.I. Tarasevich, V.E. Polyakov, 2012, published in Kolloidnyi Zhurnal, 2012, Vol. 74, No. 1, pp. 127–130.

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Tarasevich, Y.I., Polyakov, V.E. Calorimetric study of water adsorption on saponite. Colloid J 74, 121–124 (2012). https://doi.org/10.1134/S1061933X12010152

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  • DOI: https://doi.org/10.1134/S1061933X12010152

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