モンモリロナイト-水, エチレングリコール複合体の生成と安定性に関する二, 三の考察

概要

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Montmorillonite containing exchangeable cations such as alkali and alkaline earth metal ions formed complexes with water and ethylene glycol between the silicate layers. These molecules formed one or two layers depending on the polarizing power of the ion (P) as have been defined as a ratio of ionic charge to radius in Å. Therefore the complex formation was drived by the co-ordination of these polar molecules to the cations. Large univalent ions such as K^+, Rb^+ and Cs^+ possessing the value of P below unity formed a single-layer complex in the interlayers, while the others with the value above unity a double-layer one. Ethylene glycol molecules co-ordinated to the large cations seem to be orientated less regularly in the interlayer spaces. The stronger the polarizing power of the ion became, the more the molecules between the layers were stabilized thermally.
日本粘土学会の論文
1997-07-31