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Active rotational dynamics of a self-diffusiophoretic colloidal motor

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Abstract

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.

Graphical abstract: Active rotational dynamics of a self-diffusiophoretic colloidal motor

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Article information


Submitted
02 Oct 2019
Accepted
12 Dec 2019
First published
16 Dec 2019

Soft Matter, 2020, Advance Article
Article type
Paper

Active rotational dynamics of a self-diffusiophoretic colloidal motor

S. Y. Reigh, M. Huang, H. Löwen, E. Lauga and R. Kapral, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM01977D

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