Effect of Janus particles and non-ionic surfactants on the collapse of the oil-water interface under compression
Effect of Janus particles and non-ionic surfactants on the collapse of the oil-water interface under compression
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Janus颗粒和非离子表面活性剂对压缩下油水界面塌陷的影响
DOI：
10.1016/j.jcis.2021.11.160
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发表时间：
2021
影响因子：
9.9
通讯作者：
Tuan V. Vu, Sepideh Razavi
中科院分区：
文献类型：
--
作者：
Tuan V. Vu, Sepideh Razavi
假设Janus粒子和表面活性剂在压缩条件下在油水界面上表现出不同的行为。当两者都存在于界面时，它们的协同作用会导致与单独存在时不同的崩溃机制，具体取决于JPs和表面活性剂的浓度。实验使用粗粒建模方法来探讨Janus纳米颗粒和非离子表面活性剂之间的协同作用对稳定性的影响。压缩下的油-水界面。当JPs和表面活性剂都存在时，该接口被覆盖在0-55%的面积由JPs和包含在0-40%的界面表面活性剂浓度对应于临界胶束浓度（CMC）的表面活性剂。FindingsCompression的界面，只有表面活性剂导致驱逐表面活性剂分子的水相，一旦表面活性剂分子的界面浓度达到CMC值。压缩的Janus颗粒负载接口过去的密堆积点导致屈曲接口，使总界面面积保持不变，进一步压缩。当表面活性剂和JPs都存在于界面上时，JPs仍然引起屈曲，这有助于将表面活性剂分子保留在界面上。在表面活性剂的存在下，界面表现出更高水平的变形。当表面活性剂浓度较高时，在压缩下，表面活性剂分配到水相中，但界面的屈曲持续存在。
HypothesisJanus particles (JPs) and surfactants express different behaviors at the oil–water interface under compression. When both are present at the interface, their synergies result in a different collapse mechanism than when present individually depending on the concentration of the JPs and surfactants.ExperimentsCoarse-grained modeling methods were used to probe the synergies between Janus nanoparticles and nonionic surfactants on the stability of an oil–water interface under compression. When both JPs and surfactants were present, the interface was covered at 0–55% area by JPs and contained surfactants at 0–40% of the interfacial surfactant concentration corresponding to the critical micelle concentration (CMC).FindingsCompression of the interface with only surfactants resulted in the expulsion of surfactant molecules to the water phase once the interfacial concentration of surfactant molecules reached the CMC value. Compression of a Janus particle-laden interface past the closed-packing point led to a buckled interface, so that the total interfacial area remained constant upon further compression. When both surfactants and JPs were present on the interface, JPs still caused buckling, which helped retain the surfactant molecules on the interface. The interface exhibited a higher level of deformation in presence of surfactants. When the surfactant concentration was high, under compression, the surfactants partitioned into the water phase, but the buckling of the interface persisted.