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Issue 37, 2015
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Generic model for tunable colloidal aggregation in multidirectional fields

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Abstract

Based on Brownian Dynamics computer simulations in two dimensions we investigate aggregation scenarios of colloidal particles with directional interactions induced by multiple external fields. To this end we propose a model which allows continuous change in the particle interactions from point-dipole-like to patchy-like (with four patches). We show that, as a result of this change, the non-equilibrium aggregation occurring at low densities and temperatures transforms from conventional diffusion-limited cluster aggregation (DLCA) to slippery DLCA involving rotating bonds; this is accompanied by a pronounced change of the underlying lattice structure of the aggregates from square-like to hexagonal ordering. Increasing the temperature we find a transformation to a fluid phase, consistent with results of a simple mean-field density functional theory.

Graphical abstract: Generic model for tunable colloidal aggregation in multidirectional fields

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Publication details

The article was received on 07 May 2015, accepted on 11 Aug 2015 and first published on 11 Aug 2015


Article type: Paper
DOI: 10.1039/C5SM01103E
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Soft Matter, 2015,11, 7356-7366

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    Generic model for tunable colloidal aggregation in multidirectional fields

    F. Kogler, O. D. Velev, C. K. Hall and S. H. L. Klapp, Soft Matter, 2015, 11, 7356
    DOI: 10.1039/C5SM01103E

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