Shape dependent phoretic propulsion of slender active particles
Shape dependent phoretic propulsion of slender active particles
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DOI：
10.1103/physrevfluids.3.033101
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发表时间：
2018-03-14
影响因子：
2.7
通讯作者：
Liverpool, T. B.
中科院分区：
文献类型：
--
作者：
Ibrahim, Y.;Golestanian, R.;Liverpool, T. B.
我们从理论上研究了薄（细长）胶体在雷诺数消失时由其表面不对称化学反应驱动的自推进。使用匹配渐近展开的方法，我们获得了胶体自推进速度作为其形状和表面物理化学性质的函数。由于存在两个小长度尺度、杆的细长和滑移层的宽度，杆状游泳者的自泳力学比球形游泳者具有更丰富的行为谱。这导致了在细长消失的极限上的微妙之处。因此，即使对于非常细的杆，沿着游泳者表面的曲率分布，即其形状，在决定推进效率方面也起着令人惊讶的作用。我们发现，具有钝端的薄圆柱形自泳游器比具有相同纵横比的薄长球体游游器移动得更快。
We theoretically study the self-propulsion of a thin (slender) colloid driven by asymmetric chemical reactions on its surface at vanishing Reynolds number. Using the method of matched asymptotic expansions, we obtain the colloid self-propulsion velocity as a function of its shape and surface physicochemical properties. The mechanics of self-phoresis for rod-like swimmers has a richer spectrum of behaviors than spherical swimmers due to the presence of two small length scales, the slenderness of the rod and the width of the slip layer. This leads to subtleties in taking the limit of vanishing slenderness. As a result, even for very thin rods, the distribution of curvature along the surface of the swimmer, namely, its shape, plays a surprising role in determining the efficiency of propulsion. We find that thin cylindrical self-phoretic swimmers with blunt ends move faster than thin prolate spheroid shaped swimmers with the same aspect ratio.