使用可重构 Janus 乳液动态原位监测盐反离子对表面活性剂有效性的影响,Langmuir

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使用可重构 Janus 乳液动态原位监测盐反离子对表面活性剂有效性的影响
Langmuir ( IF 3.7 ) Pub Date : 2023-02-06 , DOI: 10.1021/acs.langmuir.2c02346
Marko Pavlovic _{1,

2} , Heman Kumar Ramiya Ramesh Babu ₂ , Saveh Djalali ₃ , Zoran Pavlovic ₂ , Milan Vraneš ₄ , Lukas Zeininger ₃

Affiliation

报道了一种基于使用可重构 Janus 乳液作为新型光学探针的不同电解质环境中表面活性剂有效性可视化和量化的直接方法。更具体地说，我们研究了不同类型和浓度的盐抗衡离子对商业离子和非离子表面活性剂表面活性剂表面过量的影响，即十二烷基硫酸钠 (SDS) 和吐温 80 通过原位监测双相的形态重构Janus 乳液包含碳氢化合物和碳氟化合物油。我们发现 SDS 稳定界面的界面张力显着变化（高达 15 mN·m ^–1) 可以通过滴定单价、二价和三价阳离子抗衡离子来激发，这与溶致 (Hofmeister) 系列一致。相反，对于非离子表面活性剂吐温 80 (∼3 mN·m ^–1 )，盐抗衡离子对表面活性剂有效性的影响不太明显。我们的结果揭示了一种简便的原位方法，用于监测电解质类型和浓度对表面活性剂有效性的核心作用，更广泛地说，表明 Janus 乳液可作为强大的光学探针，动态研究液体界面表面活性剂的特性。^{我们通过动态调整 Cu 2+}证明了我们的发现对于 Janus 液滴形态的电诱导形态重构的效用使用电极设置在溶液中浓度。后者为 Janus 液滴形态的液相、实时和连续调整提供了一个独特的平台，例如，它们在传感和动态光学设备平台中的应用。

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Dynamic In Situ Monitoring of the Salt Counter-ion Effect on Surfactant Effectiveness Using Reconfigurable Janus Emulsions

A straightforward method for visualization and quantification of surfactant effectiveness within different electrolyte environments based on using reconfigurable Janus emulsions as novel optical probes is reported. More specifically, we investigated the effect of different types and concentrations of salt counter-ions on the surfactant surface excess of commercial ionic and non-ionic surfactants, namely sodium dodecyl sulfate (SDS) and Tween 80 via in situ monitoring the morphological reconfigurations of biphasic Janus emulsions comprising hydrocarbon and fluorocarbon oils. We find that significant variations in interfacial tensions of SDS-stabilized interfaces (up to 15 mN·m^–1) can be evoked by titrating mono-, di-, and trivalent cationic counter-ions, which is coherent with the lyotropic (Hofmeister) series. In contrast, the salt counter-ion effect on the surfactant effectiveness was less pronounced for the non-ionic surfactant Tween 80 (∼3 mN·m^–1). Our results reveal a facile in situ method for monitoring the central role of electrolyte type and concentration on surfactant effectiveness and, more broadly, illustrate that Janus emulsions serve as powerful optical probes to dynamically study the properties of surfactants at liquid interfaces. We demonstrate the utility of our findings for an electro-induced morphological reconfiguration of Janus droplet morphologies by dynamically tuning Cu²⁺ concentration in solution using an electrode setup. The latter provides a unique platform for liquid-phase, real-time, and continuous tuning of Janus droplet morphologies, e.g., for their application in sensing and dynamic optical device platforms.

更新日期：2023-02-06

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