Reconfigurable paramagnetic microswimmers: Brownian motion affects non-reciprocal actuation
Reconfigurable paramagnetic microswimmers: Brownian motion affects non-reciprocal actuation
复制标题
可重构顺磁微型游泳器：布朗运动影响非交互驱动
DOI：
10.1039/c8sm00069g
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发表时间：
2018
期刊：
影响因子：
3.4
通讯作者：
Biswal, Sibani Lisa
中科院分区：
文献类型：
--
作者：
Du, Di;Hilou, Elaa;Biswal, Sibani Lisa
在低雷诺数下的游泳通常由大的粘性阻力主导，因此微尺度游泳者需要非互易的身体变形来产生运动。珀塞尔描述了一个简单的机械游泳者在微观尺度上由三个刚性组件连接在一起的两个铰链。在这里，我们提出了一个简单的microswimmer由两个刚性的顺磁性粒子具有不同的大小。当置于偏心磁场中时，这种简单的微型游泳者表现出非往复的身体运动，并且其游泳运动可以以可控的方式定向。可以添加额外的组件以创建多体微游泳器，由此颗粒协同作用并在给定方向上平移。对于一些多体游泳者，随机热作用力使手臂碎片化，从而修改游泳划水并改变运动速度。这项工作提供了洞察指导主动系统的运动与新颖的时变磁场。布朗运动不仅影响服从扇贝定理的正向运动者的运动，而且也影响非正向运动者的运动。
Swimming at low Reynolds number is typically dominated by a large viscous drag, therefore microscale swimmers require non-reciprocal body deformation to generate locomotion. Purcell described a simple mechanical swimmer at the microscale consisting of three rigid components connected together with two hinges. Here we present a simple microswimmer consisting of two rigid paramagnetic particles with different sizes. When placed in an eccentric magnetic field, this simple microswimmer exhibits non-reciprocal body motion and its swimming locomotion can be directed in a controllable manner. Additional components can be added to create a multibody microswimmer, whereby the particles act cooperatively and translate in a given direction. For some multibody swimmers, the stochastic thermal forces fragment the arm, which therefore modifies the swimming strokes and changes the locomotive speed. This work offers insight into directing the motion of active systems with novel time-varying magnetic fields. It also reveals that Brownian motion not only affects the locomotion of reciprocal swimmers that are subject to the Scallop theorem, but also affects that of non-reciprocal swimmers.