| 摘要: |
| 利用最大泡压法和静态吸附实验测定了烷基酚聚氧乙烯醚型Gemini表面活性剂(GSm?)和壬基酚聚氧乙烯 (10)醚(S910〉在40 X:下的表面张力，考察了 Gemini表面活性剂的分子结构对其表面活性及其在固液界面吸附特性 的影响。实验结果表明，在一定温度下，当GSm?的亲水基团相同时,其临界胶束浓度和最低表面张力均随烷基链 长的增加而降低;疏水基相同时，GSmn的氧乙烯基数越多，临界胶束浓度越高,最低表面张力越低。S910与GS910 的界面活性相近，但后者更易在溶液表面吸附。在高岭土上的饱和吸附量随GSm?烷基链长度的增加而增 加，随氧乙烯基数增加而降低;GS910在高岭土上的饱和吸附量比S910低。 |
| 关键词: Gemini表面活性剂 壬基酚聚氧乙烯醚 表面张力 吸附 |
| DOI： |
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| Study on surface property and adsorption of nonionic Gemini surfactants on solid-liquid interface |
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YANG Ying, LI Ming-yuan, LIN Mei-qin, ZHENG Xiao-yu, WU Zhao-liang
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(Enhanced Oil Recovery Research Center in China University of Petroleum, Beijing 102249, China)
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| Abstract: |
| The surface tensions of nonionic alkyi-phenol polyoxyethylene Gemini surfactants (GS?ww) and nonyl-phenol polyoxyethylene (S910) were determined at 40 t by bubble pressure tensiometer and static adsorption experiments. The effects of molecular structure of Gemini surfactant on its surface properties and adsorption properties on solid-liquid interface were investigated. The experimental results show that at certain temperature, the critical micelle concentration (CMC) and the minimum surface tension of GSww with same hydrophilic groups decrease when the alkyl chain length increases. As to GSmn with same hydrophobic groups, their CMC values increase, while the minimum surface tension decreases with the number of ethoxy group on GSmn molecules increasing. Despite some similarities between interfacial properties of S910 and GS910, the latter seems to be more easily adsorbed onto the solution surface. The saturated adsorption amount of GSmn molecules on kaolinite increases with greater alkyl chain length value, and decrease with the number of ethoxy group on GSmw molecules increasing. The amount of GS910 molecule adsorbed on the kaolinite surface was less than that of S910. |
| Key words: Gemini surfactant nonyl-phenol polyoxyethylene surface tension adsorption |
