Coalescence of air bubbles in aqueous solutions of alcohols and nonionic surfactants
Coalescence of air bubbles in aqueous solutions of alcohols and nonionic surfactants
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DOI：
10.1016/j.ces.2011.06.046
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发表时间：
2011-10
影响因子：
4.7
通讯作者：
S. Samanta;P. Ghosh
中科院分区：
文献类型：
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作者：
S. Samanta;P. Ghosh
本文报道了两种脂肪醇（正丁醇和正己醇）和四种非离子表面活性剂（吐温20、吐温40、吐温60和吐温80）水溶液中气泡的聚并。研究了醇和表面活性剂的单组分溶液以及表面活性剂-醇的二元混合溶液。通过测定水溶液的表面张力，研究了表面活性物质在空气-水界面上的吸附。测定了表面活性剂-醇单一体系和混合体系的临界胶束浓度和临界胶束浓度下的表面张力。研究了表面活性剂浓度对气泡在气-水平界面上聚并的影响。研究了静电双电层、水化和空间位阻对聚结的影响。结果发现，在混合的表面活性剂-醇系统中的薄的水膜的稳定性取决于膜中的分子间和表面力的微妙的相互作用，这与在空气-水界面处的单分子层的组成而变化。在所有系统中观察到的聚结时间的随机分布。用随机模型拟合了聚结时间分布。的分布的平均值进行了比较与7个膜排水模型的预测。
Coalescence of air bubbles in aqueous solutions of two aliphatic alcohols (viz. butanol and hexanol) and four nonionic surfactants (viz. Tween 20, Tween 40, Tween 60 and Tween 80) is reported in this work. Single-component alcohol and surfactant solutions as well as mixed binary surfactant–alcohol solutions were studied. Adsorption of the surface active compounds at air–water interface was studied by measuring the surface tension of the aqueous solutions. The critical micelle concentration and surface tension at this concentration were determined for the single and mixed surfactant–alcohol systems. The effect of concentration of surface active compounds on coalescence of air bubbles at flat air–water interface was studied. The role of electrostatic double layer, hydration and steric forces on coalescence was investigated. It was found that the stability of the thin aqueous films in mixed surfactant–alcohol systems depends on the subtle interplay of the intermolecular and surface forces in the film, which vary with the composition of the monolayer at the air–water interface. Stochastic distributions of coalescence time were observed in all systems. The coalescence time distributions were fitted by the stochastic model. The mean values of the distributions were compared with the predictions of seven film-drainage models.