Experimental Study of the Motion of Patchy Particle Swimmers Near a Wall
Experimental Study of the Motion of Patchy Particle Swimmers Near a Wall
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DOI：
10.1021/acs.langmuir.8b03220
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发表时间：
2018-12-18
期刊：
影响因子：
3.9
通讯作者：
Kretzschmar, Ilona
中科院分区：
文献类型：
--
作者：
Jalilvand, Zohreh;Pawar, Amar B.;Kretzschmar, Ilona
在这项工作中，我们证明了我们的能力，通过改变活性区域的大小，精确地定制自推进的活性胶体的表面活性。研究了化学环境中球形斑片粒子在固体边界附近的准二维自主运动。过氧化氢氧化分解成氧气和水只发生在一个明确的Pt涂层部分的聚苯乙烯颗粒表面。与颗粒相互作用的产物分子的不对称分布导致自主运动，其特征在于斑块大小从颗粒表面积的11%至25%至50%变化。由Popescu等人开发的模型分析预测的斑片状颗粒游泳者的泳动。当考虑壁对固体边界附近颗粒的优先旋转运动的影响时，与实验观察到的速度显示出良好的一致性。这项研究说明了通过控制粒子的性质而不是依赖于环境变化来精确设计粒子运动的潜力。
In this work, we demonstrate our ability to precisely tailor the surface activity of self-propelled active colloids by varying the size of the active area. The quasi two-dimensional autonomous motion of spherical patchy particle swimmers is studied in a chemical environment in the vicinity of a solid boundary. Oxidative decomposition of hydrogen peroxide into oxygen and water occurs only on a well-defined Pt-coated section of the polystyrene particle surface. The asymmetric distribution of product molecules interacting with the particle leads to the autonomous motion, which is characterized as the patch size varies from 11 to 25 to 50% of the particle surface area. The phoretic motion of patchy particle swimmers is analytically predicted by a model developed by Popescu et al. and shows good agreement with the experimentally observed velocities when the influence of the wall on the preferential rotational motion of the particles near the solid boundary is considered. The study illustrates the potential to precisely engineer the motion of particles by controlling their properties rather than depending on changes in the environment.