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Volume 186, 2016
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Magnetic filament brushes: tuning the properties of a magnetoresponsive supracolloidal coating

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Abstract

We present a theoretical study on the design of a supramolecular magnetoresponsive coating. The coating is formed by a relatively dense array of supracolloidal magnetic filaments grafted to a surface in a polymer brush-like arrangement. In order to determine and optimise the properties of the magnetic filament brush, we perform extensive computer simulations with a coarse-grained model that takes into account the correlations between the magnetic moments of the particles and the backbone crosslinks. We show that the self-assembly of magnetic beads from neighbouring filaments defines the equilibrium structural properties of the complete brush. In order to control this self-assembly, we highlight two external stimuli that can lead to significant effects: temperature of the system and an externally applied magnetic field. Our study reveals self-assembly scenarios inherently driven by the crosslinking and grafting constraints. Finally, we explain the mechanisms of structural changeovers in the magnetic filament brushes and confirm the possibility of controlling them by changing the temperature or the intensity of an external magnetic field.

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Article information


Submitted
01 Sep 2015
Accepted
28 Oct 2015
First published
28 Oct 2015

Faraday Discuss., 2016,186, 241-263
Article type
Paper
Author version available

Magnetic filament brushes: tuning the properties of a magnetoresponsive supracolloidal coating

P. A. Sánchez, E. S. Pyanzina, E. V. Novak, J. J. Cerdà, T. Sintes and S. S. Kantorovich, Faraday Discuss., 2016, 186, 241
DOI: 10.1039/C5FD00133A

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