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Complex Formation of Cation-Exchanged Montmorillonites with Propylene Carbonate: Osmotic Swelling in Aqueous Electrolyte Solutions

Published online by Cambridge University Press:  28 February 2024

Masanobu Onikata ,
Mrrsuji Kondo ,
Naoki Hayashi  and
Shoji Yamanaka
Masanobu Onikata
Affiliation:
Laboratory of Applied Clay Technology (LACT), Hojun Kogyo Co., Ltd., 1433-1 Haraichi, Annaka, Gunma 379-0133, Japan
Mrrsuji Kondo
Affiliation:
Laboratory of Applied Clay Technology (LACT), Hojun Kogyo Co., Ltd., 1433-1 Haraichi, Annaka, Gunma 379-0133, Japan
Naoki Hayashi
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
Shoji Yamanaka
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
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Abstract

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Montmorillonites saturated with Li+, Na+, K+, NH4+, Mg2+, Ca2+, Ba2+, or Ni2+ ions can form complexes with propylene carbonate (PC) by intercalation; the d(001) of montmorillonite expands to 19 Å. In the infrared absorption spectra of these complexes, the C=0 stretching band of the intercalated PC molecules shifts to lower frequencies, and the amount of the shift increased with the increase of the polarizing power of the interlayer cations. Water molecules were strongly bound to the cations. The PC molecules interacted with the cations by way of H2O molecules. With the removal of H2O, the PC molecules directly coordinate to the cations and the PC molecules show a much larger red-shift in the C=O frequency. The PC-montmorillonite complexes exhibited osmotic swelling, even in aqueous electrolyte solutions. This finding is interpreted in terms of the formation of thick electric double-layers consisting of PC and H2O between the 2:1 layers.

Keywords

Infra-Red SpectroscopyIntercalation ComplexMontmorilloniteOsmotic SwellingPropylene Carbonate
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 5 , October 1999 , pp. 672 - 677
Copyright
Copyright © 1999, The Clay Minerals Society

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