Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (01): 6-9.doi: 10.3866/PKU.WHXB20050102

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Study of Micellization of C12-2-En-C12•2Br and SDS Mixed Aqueous Solutions

JIANG Rong;ZHAO Jian-Xi;ZHANG Guo-Cheng;YOU Yi   

  1. Department of Chemistry, Fuzhou University, Fuzhou 350002
  • Received:2004-05-25 Revised:2004-07-22 Published:2005-01-15
  • Contact: ZHAO Jian-Xi

Abstract: With increasing the number of oxyethylene groups in the spacer of [C12H25N+(CH3)2]2C2H4(OC2H4)n•2Br-(C12-2-En-C12•2Br, n=2,3), the homogeneous regions in the phase diagrams of aqueous mixture of C12-2-En-C12•2Br with C12H25SO4Na (SDS) expand obviously in comparison with that of [C12H25N+(CH3)2CH2]2•2Br-/SDS mixed system. There exists a synergism between C12-2-En-C12•2Br and SDS during the mixed micellization. The minimum critical micelle concentration (cmcT,min) in the homogeneous region is 0.0339 mmol•L-1 and the corresponding molar fraction (x2*) of SDS in the bulk solution is 0.447 estimated by Rosen theory. At x2=0.5, the corresponding molar fraction (x2M) in the mixed micelle and the total aggregation number (NT) are 0.43 and 36 respectively.

Key words: C12-2-En-C12•, 2Br, SDS, Phase behavior, Mixed micellization, Synergism