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Issue 23, 2018
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Magneto-capillary dynamics of amphiphilic Janus particles at curved liquid interfaces

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Abstract

A homogeneous magnetic field can exert no net force on a colloidal particle. However, by coupling the particle's orientation to its position on a curved interface, even static homogeneous fields can be used to drive rapid particle motions. Here, we demonstrate this effect using magnetic Janus particles with amphiphilic surface chemistry adsorbed at the spherical interface of a water drop in decane. Application of a static homogeneous field drives particle motion to the drop equator where the particle's magnetic moment can align parallel to the field. As explained quantitatively by a simple model, the effective magnetic force on the particle scales linearly with the curvature of the interface. For particles adsorbed on small droplets such as those found in emulsions, these magneto-capillary forces can far exceed those due to magnetic field gradients in both magnitude and range. This mechanism may be useful in creating highly responsive emulsions and foams stabilized by magnetic particles.

Graphical abstract: Magneto-capillary dynamics of amphiphilic Janus particles at curved liquid interfaces

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Supplementary files

Article information


Submitted
13 Mar 2018
Accepted
02 May 2018
First published
02 May 2018

Soft Matter, 2018,14, 4661-4665
Article type
Communication
Author version available

Magneto-capillary dynamics of amphiphilic Janus particles at curved liquid interfaces

W. Fei, M. M. Driscoll, P. M. Chaikin and K. J. M. Bishop, Soft Matter, 2018, 14, 4661
DOI: 10.1039/C8SM00518D

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