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Issue 13, 2015
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Transportation, dispersion and ordering of dense colloidal assemblies by magnetic interfacial rotaphoresis

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Abstract

Colloidal systems exhibit intriguing assembly phenomena with impact in a wide variety of technological fields. The use of magnetically responsive colloids allows one to exploit interactions with an anisotropic dipolar nature. Here, we reveal magnetic interfacial rotaphoresis – a magnetically-induced rotational excitation that imposes a translational motion on colloids by a strong interaction with a solid–liquid interface – as a means to transport, disperse, and order dense colloidal assemblies. By balancing magnetic dipolar and hydrodynamic interactions at a symmetry-breaking interface, rotaphoresis effectuates a translational dispersive motion of the colloids and surprisingly transforms large and dense multilayer assemblies into single-particle layers with quasi-hexagonal ordering within seconds and with velocities of mm s−1. We demonstrate the application of interfacial rotaphoresis to enhance molecular target capture, showing an increase of the molecular capture rate by more than an order of magnitude.

Graphical abstract: Transportation, dispersion and ordering of dense colloidal assemblies by magnetic interfacial rotaphoresis

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Publication details

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


Article type: Paper
DOI: 10.1039/C5LC00294J
Author version available: Download Author version (PDF)
Citation: Lab Chip, 2015,15, 2864-2871
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    Transportation, dispersion and ordering of dense colloidal assemblies by magnetic interfacial rotaphoresis

    A. van Reenen, A. M. de Jong and M. W. J. Prins, Lab Chip, 2015, 15, 2864
    DOI: 10.1039/C5LC00294J

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