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A Theoretical Study on Synergism in Nonideal Binary Mixtures of Surfactants*
Wang Zhengwu1, Li Ganzuo1, Liu Juncheng1, Guan Daren2, Lou Anjing3
1.Key Laboratory ofColloid and Interface Chemistryfor State Education Ministry Shandong University, Jinan 250100;2.Institute ofTheoretical Chemistry Shandong University, Jinan 250100;3.Langmuir Center for Colloids and Interfaces, Columbia University, NY10027, USA
Abstract:
With the help of the phase separation model and the regular solution theory, on the basis of synergism conditions derived by Rubingh and Rosen, some synergism parameters in surface tension reduction effectiveness in binary mixed systems of surfactants are obtained, including the synergism condition (βs-βm<0), the optimum molar fractionα*1, the lowest surface tension of the mixtureγ*cmcand the corresponding critical micelle concentrationcmc12*at the point of maxi mum synergism. Application of these relationships to two binary systems of surfactants, C12NMe3Br~C12SO4Na and C12NMe3Br~C8SO4Na, shows both the systems to be consistent with observed data. This indicates that an easier and more accurate method on the study of synergism in nonideal binary mixed systems of surfactants has been obtained.
Key words:  Surfactants mixed system, Surface tension, Synergism, Regular solution theory.
FundProject:
非理想二元表面活性剂复配增效理论的进一步研究
王正武1, 李干佐1, 刘俊诚1, 关大任2, 娄安境3
1.山东大学胶体与界面化学教育部重点实验室, 济南 250100;2.山东大学理论化学研究所, 济南 250100;3.哥伦比亚大学Langmuir 胶体与界面研究中心, NY 10027 美国
摘要:
在Rubingh与Rosen提出非理想二元表面活性剂复配增效条件基础上,利用相分离模型和正规溶液理论,导出了体系降低表面张力的能力增效条件βs-βm<0,及最佳摩尔分数α1*、最低表面张力γ*cmc12和γ*cmc处对应的临界胶束浓度cmc*12.通过作三条γ~logc曲线或两条γ~logc曲线加上一个cmc值的方法,对C12NMe3Br~C12SO4Na、C12NMe3Br~C8SO4N两种复配体系进行验证,计算结果与实验结果相符.
关键词:  表面活性剂混合体系  表面张力  协同效应  正规溶液
DOI:10.1088/1674-0068/14/4/426-432
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