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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Takes Two to Tango: Choreography of the Coadsorption of CTAB and Hexanol at the Oil-Water Interface
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Takes Two to Tango: Choreography of the Coadsorption of CTAB and Hexanol at the Oil-Water Interface

机译：需要两个探戈：在油水界面处编制CTAB和六醇的共编制型

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Mixed surfactant systems at the oil-water interface play a vital role in applications ranging widely from drug delivery to oil-spill remediation. Synergistic mixtures are superior emulsifiers and more effective at modifying surface tension than either component alone. Mixtures of surfactants with dissimilar polar head groups are of particular interest because of the additional degree of control they offer. The interplay of hydrophobic and electrostatic effects in these systems is not well understood, in part because of the difficulty in examining their behavior at the buried oil-water interface where they reside. Here, surface-specific vibrational sum frequency spectroscopy is utilized in combination with surface tensiometry and computational methods to probe the cooperative molecular interactions between a cationic surfactant cetyltrimethylammonium bromide (CTAB) and a nonionic alcohol (1-hexanol) that induce the two initially reluctant surfactants to coadsorb synergistically at the interface. A careful deuteration study of CTAB reveals that hexanol cooperates with CTAB such that both molecules preferentially orient at the interface for sufficiently large enough concentrations of hexanol. This work's methodology is unique and serves as a guide for future explorations of macroscopic properties in these complex systems. Results from this work also provide valuable insights into how interfacial ordering impacts surface tensiometry measurements for nonionic surfactants.
机译：油水界面的混合表面活性剂系统在广泛的应用中，从药物递送到溢油修复的应用中起着至关重要的作用。协同混合物是优异的乳化剂，更有效地改变表面张力而不是单独的组分。由于它们提供的额外控制程度，具有不同极性头部组的表面活性剂的混合物特别感兴趣。这些系统中疏水性和静电效应的相互作用并不顺利地理解，部分原因是难以检查它们在潜在的油水界面处的行为。这里，表面特异性振动和频谱频率光谱与表面张力学和计算方法组合使用，以探测阳离子表面活性剂甲酰基三烷基溴铵（CTAB）与诱导两个最初不情愿的表面活性剂的非离子醇（1-己醇）之间的协同分子相互作用在界面中协同协同辅助。 CTAB的仔细氘化研究表明，己醇与CTAB配合，使得两个分子优先在界面处定向以获得足够大的足够大浓度的己醇。这项工作的方法是独一无二的，作为这些复杂系统中未来宏观性质探索的指南。这项工作的结果还提供了有价值的见解，以如何对非离子表面活性剂的表面张力测量产生表面张力测量。

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