混合阴、阳离子表面活性剂溶液中的分子相互作用和相分离

混合阴、阳离子表面活性剂的表面活性比单一组份的表面活性高得多[1]．多年来，该体系的界面化学性质得到了广泛的研究［1，2］．但是，一旦该体系在水溶液中的浓度超过其临界胶团浓度（cmc）后，就将沉淀[3]或分层［2，4］，从而失去其表面活性．后来发现卜，司，在某些情况下，阴、阳离子混合表面活性剂的沉淀现象有所改善；但一直不易找到在相当大浓度范围内仍不分层的阴、阳离子表面活性剂混合体系．本文较为简明、系统地讨论了阴、阳离子表面活性剂的相互作用与沉淀或分相的关系．这对于该体系的深入研究以及实际应用，具有积极的意义…

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

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.