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Active nematic emulsions.
Science Advances ( IF 13.6 ) Pub Date : 2018-Apr-01 , DOI: 10.1126/sciadv.aao1470
Pau Guillamat 1, 2 , Žiga Kos 3 , Jérôme Hardoüin 1, 2 , Jordi Ignés-Mullol 1, 2 , Miha Ravnik 3, 4 , Francesc Sagués 1, 2
Affiliation  

The formation of emulsions from multiple immiscible fluids is governed by classical concepts such as surface tension, differential chemical affinity and viscosity, and the action of surface-active agents. Much less is known about emulsification when one of the components is active and thus inherently not constrained by the laws of thermodynamic equilibrium. We demonstrate one such realization consisting in the encapsulation of an active liquid crystal (LC)-like gel, based on microtubules and kinesin molecular motors, into a thermotropic LC. These active nematic emulsions exhibit a variety of dynamic behaviors that arise from the cross-talk between topological defects separately residing in the active and passive components. Using numerical simulations, we show a feedback mechanism by which active flows continuously drive the passive defects that, in response, resolve the otherwise degenerated trajectories of the active defects. Our experiments show that the choice of surfactant, which stabilizes the active/passive interface, allows tuning the regularity of the self-sustained dynamic events. The hybrid active-passive system demonstrated here provides new perspectives for dynamic self-assembly driven by an active material but regulated by the equilibrium properties of the passive component.

中文翻译:

活性向列乳剂。

由多种不混溶的流体形成乳液的过程受经典概念的支配,例如表面张力,化学亲和力和粘度的差异以及表面活性剂的作用。当组分中的一种是活性的并且因此固有地不受热力学平衡定律的约束时,关于乳化的知识知之甚少。我们演示了一种这样的实现,包括将基于微管和驱动蛋白分子马达的活​​性液晶(LC)样凝胶封装到热致LC中。这些活性向列型乳液表现出各种动态行为,这些行为是由于分别存在于主动和被动组件中的拓扑缺陷之间的串扰引起的。通过数值模拟,我们展示了一种反馈机制,通过该机制,有源流会持续驱动无源缺陷,作为响应,解决否则将退化的活动缺陷轨迹。我们的实验表明,表面活性剂的选择可以稳定主动/被动界面,从而可以调节自持动态事件的规律性。此处展示的混合主动-被动系统为由活性材料驱动但受被动组件的平衡特性调节的动态自组装提供了新的视角。
更新日期:2018-04-07
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