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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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Publication details

The article was received on 13 Mar 2018, accepted on 02 May 2018 and first published on 02 May 2018


Article type: Communication
DOI: 10.1039/C8SM00518D
Citation: Soft Matter, 2018, Advance Article
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    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, Advance Article , DOI: 10.1039/C8SM00518D

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