Diffusion-Controlled Spontaneous Emulsification of Water-Soluble Oils via Micelle Swelling.,Langmuir

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Diffusion-Controlled Spontaneous Emulsification of Water-Soluble Oils via Micelle Swelling.
Langmuir ( IF 3.7 ) Pub Date : 2020-06-10 , DOI: 10.1021/acs.langmuir.0c01121
Cole R Davis ₁ , Carlos J Martinez ₁ , John A Howarter _{1,

2} , Kendra A Erk ₁

Affiliation

Spontaneous emulsification of toluene, xylenes, cyclohexane, and mineral oil in a nonionic nonylphenol polyethoxylate surfactant solution was investigated by visual observations coupled with dynamic light scatting measurements and interfacial tensiometry. For water-soluble oils, nanoscale emulsions formed spontaneously by diffusion of oil molecules into the aqueous surfactant solutions and subsequent swelling of surfactant micelles with oil. Micelle swelling rates were quantified to assess system spontaneity, revealing that oil solubility in water was directly correlated to the spontaneity of the emulsion (toluene > xylenes > cyclohexane). When experiments were intentionally designed to create surfactant concentration gradients, Marangoni flows were found to enhance spontaneity. Despite their spontaneous formation, emulsion stability was limited over the course of 40 days by Ostwald ripening followed by creaming and evaporation. These results provide insights on the likelihood of nanoemulsion formation and persistence in oily wastewater as the components in this study are present in many wastewater systems.

中文翻译：

通过Micelle溶胀扩散控制水溶性油的自发乳化。

通过目测结合动态光散射测量和界面张力法研究了非离子壬基酚聚乙氧基化物表面活性剂溶液中甲苯，二甲苯，环己烷和矿物油的自发乳化。对于水溶性油，纳米级乳液是通过将油分子扩散到表面活性剂水溶液中，然后表面活性剂胶束随油溶胀而自发形成的。胶束溶胀速率被量化以评估系统的自发性，表明油在水中的溶解度与乳液的自发性直接相关（甲苯>二甲苯>环己烷）。当有意设计实验来创建表面活性剂浓度梯度时，发现Marangoni流动增强了自发性。尽管它们是自发形成的，在40天的过程中，奥斯特瓦尔德熟化，乳化和蒸发限制了乳液的稳定性。这些结果为含油废水中纳米乳液的形成和持久性提供了见识，因为本研究中的成分存在于许多废水系统中。

更新日期：2020-07-07

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