Reverse osmotic effect in active matter
Reverse osmotic effect in active matter
复制标题
活性物质的反渗透效应
DOI：
10.1103/physreve.101.062604
复制
发表时间：
2020
影响因子：
2.4
通讯作者：
Brady, John F.
中科院分区：
文献类型：
--
作者：
Row, Hyeongjoo;Brady, John F.
在非平衡活性物质系统中，活性的空间变化可导致活性颗粒浓度的空间变化，在稳态下满足条件[Schnitzer，Phys.Rev.E48，2553（1993）1063-651X10.1103/PhysRevE.48.2553; Tailnitzer和Cates，Phys.Rev.Lett.1993]。100，218103（2008）PRLTA 00031 -900710.1103/PhysRevLett.100.218103]，其中是数密度，是活动（游泳）速度。我们表明，即使当变化是突然的，当热布朗运动是目前提供的Péclet数是大的，这个条件成立。游泳速度和浓度的这种空间变化产生了流体压力分布，该流体压力分布驱动反向渗透流-流体从高浓度区域流向低浓度区域。
In nonequilibrium active matter systems, a spatial variation in activity can lead to a spatial variation in concentration of active particles satisfying, at steady state, the condition[Schnitzer, Phys. Rev. E 48, 2553 (1993)1063-651X10.1103/PhysRevE.48.2553; Tailleur and Cates, Phys. Rev. Lett. 100, 218103 (2008)PRLTAO0031-900710.1103/PhysRevLett.100.218103], whereis the number density andis the active (swim) speed. We show that this condition holds even when the variation is abrupt and when thermal Brownian motion is present provided that the Péclet number is large. This spatial variation in swim speed and concentration produces a fluid pressure distribution that drives a reverse osmotic flow—fluid flows from regions of high concentration to low.