Dynamics of the field-induced formation of hexagonal zipped-chain superstructures in magnetic colloids |
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Authors: | Heinrich D Goñi A R Smessaert A Klapp S H L Cerioni L M C Osán T M Pusiol D J Thomsen C |
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Institution: | Institut für Festk?rperphysik, EW 5-4, Technische Universit?t Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany. |
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Abstract: | Combining nuclear magnetic resonance and molecular dynamics simulations, we unravel the long-time dynamics of a paradigmatic colloid with strong dipole-dipole interactions. In a homogeneous magnetic field, ionic ferrofluids exhibit a stepwise association process from ensembles of monomers over stringlike chains to bundles of hexagonal zipped-chain patches. We demonstrate that attractive van der Waals interactions due to charge-density fluctuations in the magnetic particles play the key role for the dynamical stabilization of the hexagonal superstructures against thermal dissociation. Our results give insight into the dynamics of self-organization in systems dominated by dipolar interactions. |
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