カチオン活性剤-高級アルコール-水で形成されるゲルの構造

抄録

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.