How walls affect the dynamics of self-phoretic microswimmers
How walls affect the dynamics of self-phoretic microswimmers
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DOI：
10.1140/epjst/e2016-60148-1
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发表时间：
2016-10-01
影响因子：
2.8
通讯作者：
Liverpool, T. B.
中科院分区：
文献类型：
--
作者：
Ibrahim, Y.;Liverpool, T. B.
研究了附近平面壁对球形泳动微游泳器表面反应驱动推进的影响。催化剂在其表面上的不对称覆盖，吸收反应物并产生产物，产生各向异性的界面流动，推动游泳者。我们分析了近壁动力学这样一个自泳者作为一个功能的不对称催化覆盖的表面。通过分析的基本奇点的流量和浓度或静电势梯度产生的，我们能够获得和合理化的相图的行为作为一个功能的游泳者表面的特性。我们发现了各种可能的行为，从“束缚态”的游泳者仍然靠近墙壁的“散射”或排斥的轨迹，在游泳者结束远离墙壁。一些束缚态的形成是纯粹的壁泳效应，不能通过简单地将泳泳泳者映射到流体动力学泳者来获得。
We study the effect of a nearby planar wall on the propulsion of a spherical phoretic micro-swimmer driven by reactions on its surface. An asymmetric coverage of catalysts on its surface which absorb reactants and generate products gives rise to an anisotropic interfacial flow that propels the swimmer. We analyse the near-wall dynamics of such a self-phoretic swimmer as a function of the asymmetric catalytic coverage of the surface. By an analysis of the fundamental singularities of the flow and concentration or electrostatic potential gradients generated we are able to obtain and rationalise a phase diagram of behaviours as a function of the characteristics of the swimmer surface. We find a variety of possible behaviours, from "bound states" where the swimmer remains near the wall to "scattering" or repulsive trajectories in which the swimmer ends far from the wall. The formation of some of the bound states is a purely wall-phoretic effect and cannot be obtained by simply mapping a phoretic swimmer to a hydrodynamic one.