Effective colloidal interactions in rotating magnetic fields

Non-equilibrium, steady-state effective pair potentials of micron-sized superparamagnetic particles in rotating magnetic fields are obtained vs. field frequency and amplitude. Trajectories of center-to-center distance between particle pairs from Brownian dynamic simulations, which were previously ma...

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Bibliographic Details
Published in:The Journal of chemical physics 2017-08, Vol.147 (7), p.074903-074903
Main Authors: Coughlan, Anna C. H., Bevan, Michael A.
Format: Article
Language:English
Subjects:
Amplitudes
Fokker-Planck equation
Magnetic fields
Rotation
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Summary:Non-equilibrium, steady-state effective pair potentials of micron-sized superparamagnetic particles in rotating magnetic fields are obtained vs. field frequency and amplitude. Trajectories of center-to-center distance between particle pairs from Brownian dynamic simulations, which were previously matched to experimental measurements, are analyzed to obtain local drift and diffusion coefficients. These coefficients are used to obtain effective interaction potentials from solving a one-dimensional Fokker-Planck equation. Biased sampling of the effective energy landscape was implemented by intermittent switching between the field of interest and a repulsive field. Our findings show how the shape and attractive well-depth of pair interactions can be tuned by changing field frequency and amplitude.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4986501