Structure of gels composed of cationic surfactant, long chain alcohol and water.

概要

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Two types of complexes (G1, G2) were presented in a stearyltrimethyl ammonium chloride (STAC) aqueous solution to which 1-hexadecanol (C16OH) was added. In the region of the molar ratio (C16OH/STAC) below 1.5, G1 and G2 coexisted, but G2 alone appeared in that of the molar ratio above 1.5.The structure of G1 with the lower melting point than that of G2 was hydrated-crystal of STAC, which contained a small amount of C16OH, because the addition of salt such as KCl raised the melting point.On the other hand, the melting point of G2 rose continuously by the increase of the molar ratio until 3.0. This indicated that the formation of G2 was completed at the molar ratio 3.0, in other words, the complex consisted of one molecule of STAC and three molecules of C16OH. And in the region of G2, an interesting phenomenon appeared on the structure. The multilayered vesicles were obtained by the preparation at a temperature above the melting point of G2, and the multilayered sheets at a temperature below the melting point. That is, the differences of the preparation temperature altered the configration of the G2 to the multilayered vesicles or sheets without the change of the binding ratio of C16OH and STAG.The formation of such vesicles suggsted that the complex composed of STAC of one molecule and C16OH under three molecules having monoalkyl chain behaved like a dialkyl ammonium cation at a temperature above the melting point.
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