Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (07): 845-850.doi: 10.1016/S1872-1508(06)60038-7

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Phase Separation in Nonaqueous Mixed Solvents Induced by Quaternary Ammonium Surfactants

LIU Jin-Yan;ZHAO Jian-Xi;CHEN Zhe   

  1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002 , P. R. China
  • Received:2005-12-15 Revised:2006-03-27 Published:2006-06-27
  • Contact: ZHAO Jian-Xi E-mail:jxzhao.colloid@fzu.edu.cn

Abstract: When a quaternary ammonium surfactant has a suitable solubility in a polar solvent, it can induce the phase self-separation of mutually soluble polar and apolar mixed solvents and a stable interface between the two phases can be formed. This phenomenon was attributed to the quaternary ammonium surfactant reaching suitable solubility in the polar solvent and driving out a considerable part of the apolar solvent, in which the surfactant is insoluble. As a result, phase separation appears. Using aqueous surfactant two-phase as reference, we suggest that it be termed as nonaqueous surfactant two-phase (NSTP) and also as two oil phases for short.

Key words: Nonaqueous surfactant two-phase, Quaternary ammonium surfactant, Solubility