短链烷基对多取代烷基苯磺酸盐界面性质的影响

引用本文: 束宁凯, 徐志成, 刘子瑜, 靳志强, 黄建滨, 张磊, 张路. 短链烷基对多取代烷基苯磺酸盐界面性质的影响[J]. 物理化学学报, 2017, 33(4): 803-809. doi: 10.3866/PKU.WHXB201612232 shu

Citation: SHU Ning-Kai, XU Zhi-Cheng, LIU Zi-Yu, JIN Zhi-Qiang, HUANG Jian-Bin, ZHANG Lei, ZHANG Lu. Effect of Short Alkyl Chain on Interfacial Properties of Poly-Substituted Alkyl Benzene Sulfonate[J]. Acta Physico-Chimica Sinica, 2017, 33(4): 803-809. doi: 10.3866/PKU.WHXB201612232 shu

短链烷基对多取代烷基苯磺酸盐界面性质的影响

束宁凯 ^1, ,
徐志成 ^2, ,
刘子瑜 ^2, ,
靳志强 ^2, ,
黄建滨 ^3, ,
张磊 ^2, ,
张路 ^2,

1.
中国地质大学(北京)地球科学与资源学院, 北京 100083;
2.
中国科学院理化技术研究所, 北京 100190;
3.
北京大学化学与分子工程学院, 北京 100871
基金项目:
国家科技重大专项（2011ZX05028）资助项目

摘要: 利用悬挂滴方法研究了2，5-二乙基-4-壬基苯磺酸钠（292）、2，5-二丙基-4-壬基苯磺酸钠（393）和2，5-二丁基-4-壬基苯磺酸钠（494）在空气-水表面和正癸烷-水界面的扩张流变性质，考察了时间、界面压、工作频率及体相浓度对扩张弹性和粘性的影响。研究发现，在低表面活性剂浓度条件下，表面吸附膜类似弹性膜，其强度由膜内分子的相互作用决定；高浓度下体相与表面间的扩散交换过程控制表面膜的性质。油分子的插入导致界面吸附分子之间相互作用的削弱，扩散交换过程主导界面膜性质；但随着短链烷基长度增加，油分子的影响变小。表面膜的强度在吸附达到平衡前已经决定，而界面膜在吸附饱和后仍然随界面分子重排而变化。

关键词:

English

Effect of Short Alkyl Chain on Interfacial Properties of Poly-Substituted Alkyl Benzene Sulfonate

1.
School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, P. R. China;
2.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China;
3.
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
Received Date: 21 November 2016
Revised Date: 23 December 2016
Available Online: 23 December 2016
Fund Project:
The project was supported by the National Science & Technology Major Project, China (2011ZX05028).

Abstract: The interfacial dilational rheological properties of 2,5-diethyl-4-nonyl benzene sulfonate(292), 2,5-dipropyl-4-nonyl benzene sulfonate(393), and 2,5-dibutyl-4-nonyl benzene sulfonate(494) at air-water and decane-water interfaces were investigated by drop shape analysis. The influences of ageing time, interfacial pressure, dilational frequency, and bulk concentration on their dilational elasticity and viscosity were expounded. The surface adsorbed film was found to be elastic in nature at lower bulk concentration, and its strength determined by the interactions between the molecules in the film. In contrast, a diffusion-exchange process between the surface and the bulk controlled the properties of film at higher concentration. The insertion of oil molecules weakened the interactions among the adsorbed molecules, causing the diffusion-exchange process to dominate the nature of the interfacial film. However, this effect of the oil molecules decreased with increasing short alkyl chain length. The strength of the surface film could be determined before the adsorption equilibrium, while the nature of the interfacial film varied after saturated adsorption because of the re-arrangement of the interfacial surfactant molecules.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

短链烷基对多取代烷基苯磺酸盐界面性质的影响

English

Effect of Short Alkyl Chain on Interfacial Properties of Poly-Substituted Alkyl Benzene Sulfonate

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短链烷基对多取代烷基苯磺酸盐界面性质的影响

English

Effect of Short Alkyl Chain on Interfacial Properties of Poly-Substituted Alkyl Benzene Sulfonate

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