Correia Elton L, Brown Nick, Razavi Sepideh
School of Chemical, Biological, and Materials Engineering, University of Oklahoma, 100 E. Boyd Street, Norman, OK 73019, USA.
Nanomaterials (Basel). 2021 Feb 2;11(2):374. doi: 10.3390/nano11020374.
The use of the Janus motif in colloidal particles, i.e., anisotropic surface properties on opposite faces, has gained significant attention in the bottom-up assembly of novel functional structures, design of active nanomotors, biological sensing and imaging, and polymer blend compatibilization. This review is focused on the behavior of Janus particles in interfacial systems, such as particle-stabilized (i.e., Pickering) emulsions and foams, where stabilization is achieved through the binding of particles to fluid interfaces. In many such applications, the interface could be subjected to deformations, producing compression and shear stresses. Besides the physicochemical properties of the particle, their behavior under flow will also impact the performance of the resulting system. This review article provides a synopsis of interfacial stability and rheology in particle-laden interfaces to highlight the role of the Janus motif, and how particle anisotropy affects interfacial mechanics.
在胶体颗粒中使用双面神（Janus）结构，即在相对的面上具有各向异性的表面性质，这在新型功能结构的自下而上组装、活性纳米马达的设计、生物传感与成像以及聚合物共混物增容等方面引起了极大关注。本综述聚焦于双面神颗粒在界面系统中的行为，例如颗粒稳定（即皮克林）乳液和泡沫，其中通过颗粒与流体界面的结合来实现稳定。在许多此类应用中，界面可能会发生变形，产生压缩应力和剪切应力。除了颗粒的物理化学性质外，它们在流动下的行为也会影响所得系统的性能。本文综述提供了含颗粒界面的界面稳定性和流变学概要，以突出双面神结构的作用，以及颗粒各向异性如何影响界面力学。
