Active rotational dynamics of a self-diffusiophoretic colloidal motor.,Soft Matter

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Active rotational dynamics of a self-diffusiophoretic colloidal motor.
Soft Matter ( IF 2.9 ) Pub Date : 2020-01-06 , DOI: 10.1039/c9sm01977d
Shang Yik Reigh ₁ , Mu-Jie Huang , Hartmut Löwen , Eric Lauga , Raymond Kapral

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The dynamics of a spherical chemically-powered synthetic colloidal motor that operates by a self-diffusiophoretic mechanism and has a catalytic domain of arbitrary shape is studied using both continuum theory and particle-based simulations. The motor executes active rotational motion when self-generated concentration gradients and interactions between the chemical species and colloidal motor surface break spherical symmetry. Local variations of chemical reaction rates on the motor catalytic surface with catalytic domain sizes and shapes provide such broken symmetry conditions. A continuum theoretical description of the active rotational motion is given, along with the results of particle-based simulations of the active dynamics. From these results a detailed description of the factors responsible for the active rotational dynamics can be given. Since active rotational motion often plays a significant part in the nature of the collective dynamics of many-motor systems and can be used to control motor motion in targeted cargo transport, our results should find applications beyond those considered here.

中文翻译：

自扩散胶体电动机的主动旋转动力学。

使用连续扩散理论和基于粒子的模拟方法研究了球形化学驱动的合成胶体电动机的动力学，该电动机通过自扩散电泳机制运行，并具有任意形状的催化域。当自生浓度梯度以及化学物质与胶体电动机表面之间的相互作用破坏球形对称性时，电动机将执行主动旋转运动。马达催化表面上化学反应速率随催化域尺寸和形状的局部变化提供了这种破坏的对称条件。给出了主动旋转运动的连续理论描述，以及基于粒子的主动动力学模拟结果。从这些结果中，可以详细说明引起主动旋转动力学的因素。

更新日期：2020-02-13

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