Dynamics of active liquid interfaces
Dynamics of active liquid interfaces
复制标题
活性液体界面动力学
DOI：
10.1126/science.abo5423
复制
发表时间：
2022-08-12
期刊：
影响因子：
56.9
通讯作者：
Dogic, Zvonimir
中科院分区：
文献类型：
--
作者：
Adkins, Raymond;Kolvin, Itamar;Dogic, Zvonimir
控制相分离流体混合物的界面是创造各种功能软材料的关键。传统上，这是用表面改性化学试剂完成的。使用实验和理论，我们研究了机械活动如何形成分离主动和被动流体的软界面。主动流体中的混沌流动会产生巨大的界面波动和非惯性传播的主动波。在高活性下，应力破坏界面连续性并驱动液滴生成，产生由有限尺寸液滴组成的乳液状活性状态。当与固体边界接触时，活性界面表现出非平衡润湿转变，其中流体克服重力爬壁。这些结果表明，机械驱动的接口，创造一个新的类软活性物质的承诺。
Controlling interfaces of phase-separating fluid mixtures is key to the creation of diverse functional soft materials. Traditionally, this is accomplished with surface-modifying chemical agents. Using experiment and theory, we studied how mechanical activity shapes soft interfaces that separate an active and a passive fluid. Chaotic flows in the active fluid give rise to giant interfacial fluctuations and noninertial propagating active waves. At high activities, stresses disrupt interface continuity and drive droplet generation, producing an emulsion-like active state composed of finite-sized droplets. When in contact with a solid boundary, active interfaces exhibit nonequilibrium wetting transitions, in which the fluid climbs the wall against gravity. These results demonstrate the promise of mechanically driven interfaces for creating a new class of soft active matter.