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Issue 2, 2015
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Magnetic and geometric anisotropy in particle-crosslinked ferrohydrogels

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Particle-crosslinked polymer composites and gels have recently been shown to possess novel or improved properties due to a covalent particle–matrix interaction. We employ spindle-like hematite particles as exclusive crosslinkers in poly(acrylamide) gels, and exploit their extraordinary magnetic properties for the realization of ferrohydrogels with a perpendicular orientation of the preferred magnetic and geometric axes of the particles. The angle-dependent magnetic properties of uniaxially oriented gels are investigated and interpreted with respect to particle–matrix interactions. The impact of the particle orientation on the resulting angle-dependent magnetic performance reveals the presence of two different contributions to the magnetization: a hysteretic component ascribed to immobilized particles, and a pseudo-superparamagnetic, non-hysteretic component due to residual particle mobility. Furthermore, a plastic reorientation of magnetic particles in the matrix when subjected to a transversal field component is observed.

Graphical abstract: Magnetic and geometric anisotropy in particle-crosslinked ferrohydrogels

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The article was received on 04 Oct 2014, accepted on 12 Nov 2014 and first published on 17 Nov 2014

Article type: Paper
DOI: 10.1039/C4CP04493B
Citation: Phys. Chem. Chem. Phys., 2015,17, 1290-1298
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    Magnetic and geometric anisotropy in particle-crosslinked ferrohydrogels

    L. Roeder, P. Bender, M. Kundt, A. Tschöpe and A. M. Schmidt, Phys. Chem. Chem. Phys., 2015, 17, 1290
    DOI: 10.1039/C4CP04493B

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