Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (06): 557-559.doi: 10.3866/PKU.WHXB20030616

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Mixed Micellization of C12-s-C12•2Br and n-Hexanol in Aqueous Solution

Zhao Jian-Xi;Zhu Yong-Ping;You Yi;Cai Wei-Rong   

  1. College of Chemistry and Chemical Engineering,Fuzhou University,Fuzhou,350002
  • Received:2002-09-02 Revised:2002-12-07 Published:2003-06-15
  • Contact: Zhao Jian-Xi E-mail:jxzhao.colloid@fzu.edu.cn

Abstract: 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.

Key words: Quaternary-ammonium dimeric surfactants, n-hexanol effects,  Micellization