Issue 23, 2011

Magneto-mechanical coupling in CoFe2O4-linked PAAm ferrohydrogels

Abstract

Magnetically blocked CoFe2O4 nanoparticles are used as nanoscopic mechanical probes in PAAm solutions and gels with different architectures. From quasi-static magnetometry, we extract information on the mechanical feedback from the local restoring forces on the rotational remagnetization of the probes. While the hysteretic magnetic behavior of conventionally crosslinked PAAm ferrohydrogels can be explained by the predominantly viscous processes involved with particle rotation, a reversible, Langevin-like magnetization curve is found in particle-linked ferrohydrogels. From the local restoring force, we conclude on the elastic moduli of the underlying process, in accordance with expectations from statistical thermodynamics.

Graphical abstract: Magneto-mechanical coupling in CoFe2O4-linked PAAm ferrohydrogels

Article information

Article type
Paper
Submitted
07 Nov 2010
Accepted
09 Feb 2011
First published
07 Apr 2011

J. Mater. Chem., 2011,21, 8466-8474

Magneto-mechanical coupling in CoFe2O4-linked PAAm ferrohydrogels

N. Frickel, R. Messing and A. M. Schmidt, J. Mater. Chem., 2011, 21, 8466 DOI: 10.1039/C0JM03816D

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