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香兰素基非离子表面活性剂的动态表面张力与气/液界面吸附行为
翟功勋, 丁凤美, 邢志奇, 周 翔
东华大学 化学化工与生物工程学院,上海 201620
摘要:
通过最大气泡压力法测定香兰素基聚氧乙烯醚(VAEO)的动态表面张力,利用Word-Tordai方程研究其在气/液界面的吸附行为。结果表明,质量浓度低于临界胶束浓度(cmc)时,VAEO在吸附前期为扩散控制吸附,在吸附后期为混合动力控制吸附;质量浓度大于cmc时,为混合动力控制吸附,胶束不影响吸附行为。VAEO10和VAEO20的扩散系数D的数量级为10-11 m2/s,比文献报道的NPEO9低一个数量级。
关键词:  香兰素基聚氧乙烯醚  动态表面张力  气/液界面吸附  吸附机理
DOI:10.13218/j.cnki.csdc.2018.06.001
分类号:TQ423.2
基金项目:国家高技术研究发展计划(863计划)(2013AA06A307)
Dynamic surface tension and adsorption behavior of vanillin-based nonionic surfactants at air-water interface
Institute of Chemical and Biological Engineering, Donghua University, Shanghai 201620, China
Abstract:
The dynamic surface tension of vanillin-based polyoxyethylene ethers (VAEO) was measured by the maximum bubble pressure method. The adsorption mechanism of surfactants at gas-liquid interface was studied by using Word-Tordai equation. The results show that when the mass concentration of VAEO is below critical micelle concentration (cmc), the adsorption of VAEO obeys the mechanisms of diffusion controlled adsorption and mixed diffusion-kinetic controlled adsorption, respectively, at the early stage and the later stage of adsorption. When the mass concentration is above cmc, the adsorption mechanism is mixed diffusion-kinetic controlled adsorption, where the micelles do not affect the adsorption behavior. The magnitude of diffusion coefficients of VAEO10 and VAEO20 are 10-11 m2/s, which are lower than the NPEO9’s reported in literature.
Key words:  vanillin-based polyoxyethylene ether  dynamic surface tension  gas-liquid interfacial adsorption  adsorption mechanism

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