C_(12)-s-C_(12)·2Br和己醇混合水溶液的胶团化行为

Mixed Micellization of C_(12) s C_(12)· 2Br and n-Hexanol in Aqueous Solution

己醇的加入使C12-s-C12·2Br(s=3,4,6)的临界胶团浓度cmc降低,s越大其影响也越显著.己醇参与组成了混合胶团,当添加的己醇量相同时,它在混合胶团中的摩尔分数几乎一样.混合胶团表面反离子解离度随己醇浓度增大而增大.

The effects of n hexanol on the micellization of quaternary ammonium dimeric surfactants (C12 s C12· 2Br,s=3,4,6) have been examined using conductivity and steady fluorescence measurements.The results showed that the critical micelle concentration cmc decreases with the addition of n hexanol.The larger s,the stronger the effect.The dimeric surfactant and n hexanol form the mixed micelles with the alkyl chains of n hexanol molecules penetrating into the micelle interior and with hydroxyl groups lie in the palisade layer of the micelle.At the same concentration of n hexanol in aqueous solution,the molar fraction of n hexanol in the mixed micelle is almost the same for different s.The ionization degree of the mixed micelle increases with increasing n hexanol concentration.