水溶液中表面活性剂对带电荷膜表面耐油性能的影响

Hu Xiaodong , Han Jing , Xu Linyan , Qian Shuangbei , Guo Tong , Wu Sen , Liu Yanan , Jiang Zhongyi
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引用次数: 1

摘要

在水中加入少量表面活性剂可以明显改变油滴表面的状态。水/油分离膜的耐油性能对过滤效率和使用寿命有重要影响。原子力显微镜(AFM)是研究界面相互作用的常用手段。本文将油(十六烷)液滴修饰探针作为力传感器,用于检测流体中油与带电膜之间的粘附力。在水中低浓度的阳离子表面活性剂作用下,油与带负电荷的纳滤膜的粘附力增强,从纯水中的91.04 nN增加到152.33 nN。相反,阴离子表面活性剂浓度较低导致附着力较低,从纯水的5.10 nN下降到3.13 nN。测得的力与接触角的实验结果吻合较好。然而,离子活性剂的高百分比导致上述两种情况下的相互作用较低。此外,还讨论了非离子活性剂对油与两种带电膜之间粘附的影响。结果表明,无论膜表面带正电荷还是负电荷,非离子活性剂在水中的作用都会减弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Surfactants in Aqueous Solutions on Oil-Resisting Performance of Membrane Surfaces with Charges by Atomic Force Microscopy

The state of the surface of oil droplet can be changed obviously by adding a small amount of surfactant in water. The oil-resisting performance of membranes for water/oil separation has a significant influence on filtration efficiency and life span. The atomic force microscope (AFM) is commonly utilized to explore interface interaction. In this paper, the probe modified by an oil (hexadecane) droplet was used as a force sensor to detect adhesion forces between oil and the charged membranes in fluid. Under low concentration of cationic surfactant in water, the adhesion between oil and the nanofiltration (NF) membrane with negative charges was intensified, increasing from 91.04 nN in pure water to 152.33 nN. On the contrary, the low concentration of anionic surfactant resulted in lower adhesion, which decreased from 5.10 nN in pure water to 3.13 nN in this situation. The measured force behavior agreed well with experimental observation from contact angle measurement. However, the high percentage of ionic active agent caused lower interaction in the above two cases. Moreover, the effect of the nonionic active agent on the adhesion between oil and two kinds of charged membranes was also discussed. Results show that the interaction would be weakened with the aid of the nonionic active agent in water, regardless of the positive or negative charges on the membrane surface.

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