Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (05): 450-453.doi: 10.3866/PKU.WHXB19950514

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Molecular Interaction and Phase-separation in the Aqueous Solution of Anioniccationic Sufractant Mixture

Li Xue-Gang,Zhao Guo-Xi   

  1. Chemistry Department of Peking University,Beijing 100871
  • Received:1994-03-28 Revised:1994-09-28 Published:1995-05-15
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Abstract:

The interactions between C8H17(OC2H4)nSO4Na (C8EnS; n=0, 1, 3) and C8H17NC6H5Br(C8Py), C8EnS and CmH2m+2NC5H5Br (CmPy; m=10, 12, 14, 16), t-C8H17C6H4(OC2H4)9.8SO4Na (C8φE9.8S) and CmPy in micelles have been studied by surface tension method. The partial ternary "phase diagram" of C8EnS-C8Py-H2O and C8EnS-C12Py-H2O systems have been obtained. The results show that with the increase of n, the interaction between C8EnS and C8Py decreases and the stability of aqueous solution of C8EnS-C8Py increases. With the increase of m, the interaction between C8E3S and CmPy increases and the stability of aqueous solution of C8E3S-CmPy decreases. The interaction between C8φE9.8S and CmPy is strong while the aqueous solution of C8φE9.8S- CmPy is still very stable.

Key words: Cationic-anionic surfactant, Molecular interaction, Phase-separation