短链烷基对多取代烷基苯磺酸盐界面性质的影响

发布时间：2019-07-10 08:21

【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。
文内图片：

图片说明：不同浓度494溶液的动态表面张力(A)、动态表面扩张弹性(B)
[Abstract]:The expansive Rheological properties of 2, 5-diethyl-4-nonylbenzenesulfonate (292), 2, 5-dipropyl-4-nonylbenzenesulfonate (393) and 2, 5-dibutyl4-nonylbenzenesulfonate (494) on air-water surface and n-decane-water interface were studied by hanging drop method. The effects of time, interfacial pressure, working frequency and bulk phase concentration on dilation elasticity and viscosity were investigated. It is found that under the condition of low concentration of surfactants, the strength of the surface adsorption film is similar to that of the elastic film, and the strength of the surface adsorption film is determined by the interaction of the molecules in the membrane, and the diffusion exchange process between the bulk phase and the surface at high concentration controls the properties of the surface film. The insertion of oil molecules leads to the weakening of the interaction between the adsorbed molecules at the interface and the properties of the interface film in the diffusion exchange process, but with the increase of the length of short chain alkyl, the effect of oil molecules becomes smaller. The strength of the surface film was determined before the adsorption reached equilibrium, while the interfacial film still changed with the rearrangement of the interface molecules after adsorption saturation.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国科学院理化技术研究所;北京大学化学与分子工程学院;
【基金】：国家科技重大专项(2011ZX05028)资助项目~~
【分类号】：O647

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