论文标题
活性抑制的相分离
Activity-suppressed phase separation
论文作者
论文摘要
我们使用连续模型来检查活动对分离延伸活性列和被动液的混合物的相位的影响。我们强调了先前认为的界面活性应力和散装活性应力的独特作用，这些应力将伴随到液体晶体的自由度。如前所述，界面活性应力可以阻止相分离。大量的扩大活性应力可以通过持续的流体自我刺激来强烈抑制相位，从而大大降低了相对于被动系统的温度/浓度平面中共存区域的大小。如最近的实验所示，相分离状态是连续分裂和合并液滴的动态乳液样稳态。使用缩放分析和仿真，我们确定了液滴大小对活动的依赖性的各种制度。这些结果可以提供一个标准，以识别负责在实验中逮捕阶段分离的机制。
We use a continuum model to examine the effect of activity on a phase separating mixture of an extensile active nematic and a passive fluid. We highlight the distinct role of previously considered interfacial active stresses and bulk active stresses that couple to liquid crystalline degrees of freedom. Interfacial active stresses can arrest phase separation, as previously demonstrated. Bulk extensile active stresses can additionally strongly suppress phase separation by sustained self-stirring of the fluid, substantially reducing the size of the coexistence region in the temperature/concentration plane relative to that of the passive system. The phase separated state is a dynamical emulsion-like steady state of continuously splitting and merging droplets, as suggested by recent experiments. Using scaling analysis and simulations, we identify various regimes for the dependence of droplet size on activity. These results can provide a criterion for identifying the mechanisms responsible for arresting phase separation in experiments.
