Self-Propelled Janus Particles in a Ratchet: Numerical Simulations
Self-Propelled Janus Particles in a Ratchet: Numerical Simulations
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DOI：
10.1103/physrevlett.110.268301
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发表时间：
2013-06-24
影响因子：
8.6
通讯作者：
Nori, Franco
中科院分区：
文献类型：
--
作者：
Ghosh, Pulak K.;Misko, Vyacheslav R.;Nori, Franco
本文对二维周期性区隔通道中自走式过阻尼微游泳体（如Janus粒子）的布朗输运进行了不同区隔几何形状、边界碰撞动力学和粒子旋转扩散的数值研究。由此产生的时间相关的主动布朗运动在存在空间不对称的情况下受到整流。我们证明了Janus粒子的棘轮可以比普通的热势棘轮强几个数量级，因此可以在实验上获得。特别是，只要加入一小部分Janus粒子，就可以诱导大量被动粒子的自主泵送。
Brownian transport of self-propelled overdamped microswimmers (like Janus particles) in a two-dimensional periodically compartmentalized channel is numerically investigated for different compartment geometries, boundary collisional dynamics, and particle rotational diffusion. The resulting time-correlated active Brownian motion is subject to rectification in the presence of spatial asymmetry. We prove that ratcheting of Janus particles can be orders of magnitude stronger than for ordinary thermal potential ratchets and thus experimentally accessible. In particular, autonomous pumping of a large mixture of passive particles can be induced by just adding a small fraction of Janus particles.