Symbiosis between the components of a soft composite material responding to osmotic shock: The case of three-liquid systems.
Symbiosis between the components of a soft composite material responding to osmotic shock: The case of three-liquid systems.
复制标题
DOI：
10.1016/j.jcis.2021.10.086
复制
发表时间：
2021-10
影响因子：
9.9
通讯作者：
Wei Chen;P. Clegg;Tao Li
中科院分区：
文献类型：
--
作者：
Wei Chen;P. Clegg;Tao Li
假设对于外部渗透压大于拉普拉斯压的常规高内相乳液（HIPE），一旦渗透平衡被打破，水相的溶胀或收缩可容易地引发相分离。混合两个不混溶的分散相在一个双HIPE可以演变不同的渗透压休克后，这是预期创建一个协同效应，可以挫败相分离的system.ExperimentsOsmotic响应的双HIPE进行了研究，在表面的NaCl溶液在一个范围内的摩尔浓度。荧光共聚焦显微镜研究进行跟踪微观尺度上的响应。表面张力的测量揭示了所使用的表面活性剂的界面行为。FindingsA协同效应是通过分散油之间的共生过程实现的，其中一种类型的液滴变得更加稳定，并包装在其他的停止其聚结。其本质驱动力来自于表面活性剂分子在油水界面的吸附/脱附。通过直接调节渗透压差，也可以实现渗透性下冲击和渗透性上冲击之间的转换。这种共生关系极大地拓展了多液体系的潜在技术应用，并可用于设计新型多功能复合材料。
HypothesisFor conventional high internal phase emulsions (HIPEs) with an external osmotic pressure greater than Laplace pressure, once the osmotic balance is broken, the swelling or shrinking of the aqueous phase can easily trigger phase separation. Mixing two immiscible dispersed phases in a double HIPE can evolve differently following an osmotic shock, which is expected to create a synergistic effect that can frustrate the phase separation of the system.ExperimentsOsmotic responses of double HIPEs were studied at the surface of a NaCl solution at a range of molarities. Fluorescence confocal microscopy studies were carried out to track the responses on microscopic scales. Measurements on surface tensions revealed the interfacial behaviors of the used surfactant.FindingsA synergistic effect is achieved by a symbiotic process between the dispersed oils, where one type of droplets become more stable and pack around the other ones to halt their coalescence. The essential drive comes from the adsorption/desorption of surfactant molecules at oil–water interfaces. By directly adjusting the osmotic pressure difference, transitions between osmotic down-shock and osmotic up-shock can also be realized. This symbiosis greatly expands the potential technological applications of multiple-liquid systems, and can be used to design novel multi-functional composite materials.