Na型モンモリロナイトによる非イオン界面活性剤の包接と油性ゲルの生成 : 膨潤性粘土鉱物の包接作用 (第1報)

概要

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An oil gel was formed in a ternary system of sodium-montmollironite (Na-Mon), nonionic surfactant (SAA) and oil. Formation of the oil gel was caused by formation of an inclusion compound functioning as an SAA/Na-Mon binary system. The SAA having about 8 for an HLB value was easily taken in by the interlayer (silicate layer) of Na-Mon. From X-ray diffraction measurement, basal spacings of Na-Mon increased with the amount of SAA. The basal spacings of inclusion compounds were constant at an SAA/Na-Mon weight ratio of 1/1. Inclusion compound formation was completed when the adsorption of SAA in the interlayer of Na-Mon was saturated with a monomolecular layer at a 1/1 weight ratio.<BR>The inclusion compound swelled on adding an oil such as liquid paraffin (LP). with subsequent formation of the oil gel. X-ray diffraction indicated regular diffraction peaks in the stable and rigid oil gels. The structure of the swollen compound was lamellar with basal spacing ranging from 5060 Å. This interlayer swelling occurred with the inclusion of about 26 wt% of LP in the interlayer of the inclusion compound (SAA/Na-Mon).
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