通过吸附-解吸操作可逆转换有机-无机杂种的两亲性,The Journal of Physical Chemistry C

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通过吸附-解吸操作可逆转换有机-无机杂种的两亲性
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-08-16 , DOI: 10.1021/acs.jpcc.9b07040
Chenhui Han ₁ , Eric R. Waclawik ₁ , Xiaofei Yang ₂ , Peng Meng ₁ , Hengquan Yang ₃ , Ziqi Sun ₁ , Jingsan Xu ₁

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表面活性剂由于在基础研究，工业生产和日常生活中的广泛使用而具有重要意义。设计和合成具有可逆两亲性转换的表面活性剂仍然是一个巨大的挑战。在这里，我们报告了一种“混合型表面活性剂”，该混合物是通过油-水界面的化学吸附作用将油溶性分子硬脂酸与水分散性Al ₂ O ₃纳米纤维结合而成的。硬脂酸的长碳链起表面活性剂的疏水尾的作用，而无机纳米纤维则起亲水头的作用。通过控制附着在Al ₂ O上的硬脂酸的吸附-解吸体积，这种杂化的表面活性剂在亲水状态和亲脂状态之间表现出可逆的转换。₃纳米纤维。因此，通过这种有机-无机混合物稳定的乳液可以在水包油型和油包水型之间可逆地转化。与常规方法不同，不需要其他外部刺激来设置杂化表面活性剂的两亲特性。另外，可以基于乳液系统轻松制备有机-无机三维固体泡沫，这证明了其在修复环境中溢油的潜在应用。

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Reversible Switching of the Amphiphilicity of Organic–Inorganic Hybrids by Adsorption–Desorption Manipulation

Surfactants are of great significance due to their wide use in fundamental research, industrial production, and daily lives. It remains a grand challenge to design and synthesize surfactants exhibiting reversible amphiphilicity switching. Here, we report on a “hybrid surfactant” prepared by combining an oil-soluble molecule, stearic acid, with water-dispersible Al₂O₃ nanofibers via chemisorption at the oil–water interface. The long carbon chain of stearic acid functions as the hydrophobic tail of the surfactant, while the inorganic nanofibers can act as the hydrophilic head. This hybrid surfactant exhibits reversible switching between hydrophilic and lipophilic states by manipulating the adsorption–desorption volume of stearic acid attached to the Al₂O₃ nanofibers. Therefore, the emulsions stabilized by this organic–inorganic hybrid can reversibly transform between oil-in-water and water-in-oil type. Unlike conventional approaches, no other external stimulus is needed to set the amphiphilic properties of the hybrid surfactant. As a bonus, organic–inorganic three-dimensional solid foams can be readily prepared based on the emulsion system, which demonstrates potential applications for remediation of oil spills in the environment.

更新日期：2019-08-16

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