Responsive drop method: quantitative in situ determination of surfactant effectiveness using reconfigurable Janus emulsions,Soft Matter

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Responsive drop method: quantitative in situ determination of surfactant effectiveness using reconfigurable Janus emulsions
Soft Matter ( IF 2.9 ) Pub Date : 2020-11-02 , DOI: 10.1039/d0sm01724h
Saveh Djalali _{1,

2,

3,

4} , Bradley D. Frank _{1,

2,

3,

4} , Lukas Zeininger _{1,

2,

3,

4}

Affiliation

Characterization of surfactant effectiveness and thus an evaluation of their performance in a wide range of emulsion technologies requires a precise determination of key parameters including their critical micelle concentrations as well as their ability to lower the surface tension at interfaces. In this study, we describe a new approach to quantify marginal variations in interfacial tension of surfactant stabilized fluid interfaces. The method is based on a unique chemical-morphological coupling inside bi-phasic oil-in-water Janus emulsions that undergo dynamic morphological transitions in response to changes in the surfactant type, concentration, ratio, and configuration. Variations in Janus droplet morphologies are readily monitored in situ using a simple side-view imaging setup, resulting in a fast, convenient, cost-effective, time-, and sample-saving technique for the characterization of classical surfactant systems. In addition, the reported method facilitates monitoring of triggered changes in surfactant effectiveness, e.g. invoked by external triggers, and thus proves particularly useful for the in situ analysis of stimuli-responsive surfactants and emulsions.

中文翻译：

响应滴法：使用可重构的Janus乳液定量原位测定表面活性剂有效性

表面活性剂有效性的表征，以及因此在多种乳液技术中对其性能的评估，需要精确确定关键参数，包括其临界胶束浓度以及降低界面处表面张力的能力。在这项研究中，我们描述了一种新的方法来量化表面活性剂稳定的流体界面的界面张力的边际变化。该方法基于双相水包油Janus乳液内部的独特化学形态耦合，该乳液根据表面活性剂类型，浓度，比例和构型的变化而经历动态形态转变。Janus液滴形态的变化很容易就地监测使用简单的侧视图成像设置，可实现快速，方便，经济高效，省时且节省样品的技术，用于表征经典的表面活性剂系统。另外，所报道的方法有助于监测表面活性剂有效性的触发变化，例如由外部触发引发的变化，因此证明对刺激响应性表面活性剂和乳液的原位分析特别有用。

更新日期：2020-11-06

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