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Issue 69, 2019
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Directional and velocity control of active droplets using a rigid-frame

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Abstract

This paper introduces a novel directional control method of self-propelled oil droplets. Oil droplets locomote spontaneously with surfactant action. This self-propulsion is caused by Marangoni convection within the oil droplet due to differences in the surfactant concentration at the droplet surface. Recent studies have reported that self-propelled oil droplets change their locomotion style depending on their shapes. We confirm that spherical oil droplets move randomly, including straight motion, bending motion, and rotation. In particular, we discover that boomerang-shaped oil droplets exhibit only straight motion. In this study, we introduce an exoskeleton for the directional and velocity control of oil droplets. A droplet shaped as a boomerang by an exoskeleton locomotes in the direction from a concave region to a convex region. Through experimental studies, we found that the stability of the velocity and locomotion direction depended on the boomerang shape. Self-propelled oil droplets with exoskeletons were then applied to a transporting robot driven only by the energy obtained from chemical reactions. We demonstrate the robot pushes and transports an object floating on water.

Graphical abstract: Directional and velocity control of active droplets using a rigid-frame

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Article information


Submitted
25 Sep 2019
Accepted
28 Nov 2019
First published
06 Dec 2019

This article is Open Access

RSC Adv., 2019,9, 40523-40530
Article type
Paper

Directional and velocity control of active droplets using a rigid-frame

M. Yamada, H. Shigemune, S. Maeda and H. Sawada, RSC Adv., 2019, 9, 40523
DOI: 10.1039/C9RA07789H

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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