Issue 1, 2016

Buckling of paramagnetic chains in soft gels


We study the magneto-elastic coupling behavior of paramagnetic chains in soft polymer gels exposed to external magnetic fields. To this end, a laser scanning confocal microscope is used to observe the morphology of the paramagnetic chains together with the deformation field of the surrounding gel network. The paramagnetic chains in soft polymer gels show rich morphological shape changes under oblique magnetic fields, in particular a pronounced buckling deformation. The details of the resulting morphological shapes depend on the length of the chain, the strength of the external magnetic field, and the modulus of the gel. Based on the observation that the magnetic chains are strongly coupled to the surrounding polymer network, a simplified model is developed to describe their buckling behavior. A coarse-grained molecular dynamics simulation model featuring an increased matrix stiffness on the surfaces of the particles leads to morphologies in agreement with the experimentally observed buckling effects.

Graphical abstract: Buckling of paramagnetic chains in soft gels

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Article information

Article type
22 Jul 2015
08 Oct 2015
First published
08 Oct 2015
This article is Open Access
Creative Commons BY license

Soft Matter, 2016,12, 228-237

Author version available

Buckling of paramagnetic chains in soft gels

S. Huang, G. Pessot, P. Cremer, R. Weeber, C. Holm, J. Nowak, S. Odenbach, A. M. Menzel and G. K. Auernhammer, Soft Matter, 2016, 12, 228 DOI: 10.1039/C5SM01814E

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