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Dynamics of a surface tension driven colloidal motor based on an active Janus particle encapsulated in a liquid drop

Published online by Cambridge University Press:  02 March 2023

Subramaniam Chembai Ganesh Open the ORCID record for Subramaniam Chembai Ganesh [Opens in a new window] ,
Joel Koplik Open the ORCID record for Joel Koplik [Opens in a new window] ,
Jeffrey F. Morris Open the ORCID record for Jeffrey F. Morris [Opens in a new window]  and
Charles Maldarelli Open the ORCID record for Charles Maldarelli [Opens in a new window]
Subramaniam Chembai Ganesh
Affiliation:
Benjamin Levich Institute and Department of Chemical Engineering, City College of New York, City University of New York, New York, NY 10031, USA
Joel Koplik
Affiliation:
Benjamin Levich Institute and Department of Physics, City College of New York, City University of New York, New York, NY 10031, USA
Jeffrey F. Morris
Affiliation:
Benjamin Levich Institute and Department of Chemical Engineering, City College of New York, City University of New York, New York, NY 10031, USA
Charles Maldarelli*
Affiliation:
Benjamin Levich Institute and Department of Chemical Engineering, City College of New York, City University of New York, New York, NY 10031, USA
*
†Email address for correspondence: cmaldarelli@ccny.cuny.edu
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Abstract

A colloidal motor driven by surface tension forces is theoretically designed by encapsulating an active Janus particle in a liquid drop which is immiscible in the suspending medium. The Janus particle produces an asymmetric flux of a solute species which induces surface tension gradients along the liquid–liquid interface between the drop and the surrounding fluid. The resulting Marangoni forces at the interface propel the compound drop/Janus particle system. The propulsion speeds of the motor are evaluated for a range of relative sizes and positions of the drop and the particle and across a range of transport properties of the drop and the suspending medium. It is demonstrated that the proposed design can produce higher propulsion velocities than the traditional Janus-particle-based colloidal motors propelled by neutral diffusiophoresis.

JFM classification

Convection: Marangoni convection Complex Fluids: Active matter Drops and Bubbles: Drops
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 958 , 10 March 2023 , A12
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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