Effect of Hydrophobic Chain Length on the Interfacial Dilational Rheological Properties of Polyoxyethylene Sorbitan Fatty Acid Ester
文献类型： 外文期刊
作者： Li Ming 1 ; Cao Chong 1 ; Xiong Ke-Jie 1 ; Du Feng-Pei 1 ;
作者机构： 1.China Agr Univ, Coll Sci, Dept Appl Chem, Beijing 100193, Peoples R China
2.Heilongjiang Acad Agr Sci, Res Ctr Pesticide Applicat, Harbin 150086, Peoples R China
关键词： Polyoxyethylene sorbitan fatty acid ester;Hydrophobic chain length;Interface;Dilational modulus;Phase angle
期刊名称：ACTA PHYSICO-CHIMICA SINICA （ 影响因子：2.268； 五年影响因子：1.218 ）
ISSN： 1000-6818
年卷期： 2015 年 31 卷 2 期
页码：
收录情况： SCI
摘要： The dilational rheological properties of a series of polyoxyethylene sorbitan fatty acid surfactants (TweenX) at the decane/water interface have been investigated using the drop shape analysis method. The experiment results showed that larger quantities of the Tween20 molecules with shorter hydrophobic chain lengths were adsorbed at the interface because they could arrange more closely. Tween40 and Tween60 molecules had similar "actual cross-sectional areas", which meant that their interfacial tensions were also similar at the critical micelle concentration (Y-cmc). Furthermore, when the bulk concentration exceeded the critical micelle concentration (cmc), the modulus and elasticity of Tween20 were larger than those of Tween40 and Tween60. When the hydrophobic alkyl chain of TweenX reached a certain length, the interfacial film properties of TweenX affected by the hydrophobic chain length decreased, which led to similar dilational parameters.
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