Paramagnetic colloids: Chaotic routes to clusters and molecules

Physical Review. E
Hamed AbdiCraig E Maloney

Abstract

We present computer simulations and experiments on dilute suspensions of superparamagnetic particles subject to rotating magnetic fields. We focus on chains of four particles and their decay routes to stable structures. At low rates, the chains track the external field. At intermediate rates, the chains break up but perform a periodic (albeit complex) motion. At sufficiently high rates, the chains generally undergo chaotic motion at short times and decay to either closely packed clusters or more dispersed, colloidal molecules at long times. We show that the transition out of the chaotic states can be described as a Poisson process in both simulation and experiment.

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Citations

Jul 22, 2020·Physical Review. E·C Reichhardt, C J O Reichhardt
Jun 4, 2019·The Journal of Chemical Physics·Anna C H CoughlanMichael A Bevan
Jan 26, 2021·Soft Matter·Aldo Spatafora-SalazarSibani Lisa Biswal

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