Issue 21, 2021

Rotating ellipsoidal catalytic micro-swimmers via glancing angle evaporation

Abstract

The ability to generate rotation in ellipsoidal catalytic micro swimming devices by catalyst deposition at glancing angles allows reliable access to circling trajectories. This behaviour could enable propulsive ellipsoids to gather cargo and enhance mixing at small scales. Catalytically propelled colloidal rotation has been previously achieved in spherical swimming devices by means of neighbour shadowing during catalyst deposition leading to non-symmetrical coatings. However in this work shadowing effects arise due to the ellipsoid's inherent anisotropy, removing the requirement for a closely packed colloidal crystal monolayer. We use geometric analysis of the catalyst deposition process, and mechanistic understanding to propose a link between the observed trajectories and the catalyst distribution and suggest further routes to improve control of rotation rates.

Graphical abstract: Rotating ellipsoidal catalytic micro-swimmers via glancing angle evaporation

Supplementary files

Article information

Article type
Paper
Submitted
18 jun. 2021
Accepted
19 sep. 2021
First published
21 sep. 2021
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2021,2, 7045-7053

Rotating ellipsoidal catalytic micro-swimmers via glancing angle evaporation

A. Kirvin, D. Gregory, A. Parnell, A. I. Campbell and S. Ebbens, Mater. Adv., 2021, 2, 7045 DOI: 10.1039/D1MA00533B

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