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Issue 22, 2017
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Magneto-induced anisotropy in magnetic colloids of superparamagnetic magnetite nanoparticles in an external magnetic field

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Abstract

Here we report a study of chain formation and the magnetic anisotropy induced by them in suspensions of slightly anisotropic Fe3O4 nanoparticles in water and in aqueous V2O5 suspensions. An investigation into the magnetization of the fluid and frozen suspensions, the application of dynamic light scattering techniques and the observation of the magnetic anisotropy in the frozen magnetically aligned samples allowed us to confirm the existence of chains of Fe3O4 in both suspensions. Our study shows that the magneto-induced anisotropy appearing in magnetic fields in colloids with Fe3O4 particles is mainly due to many particle (chain) magneto-induced anisotropy, but not due to single particle magneto-induced anisotropy connected with particle shape anisotropy. In other words, the single particle magneto-induced anisotropy is much smaller than the many particle (chain) anisotropy. The anisometry of the chains provides effective coupling with the nonmagnetic V2O5 component of the suspension and results in its strong sensitivity to the magnetic field.

Graphical abstract: Magneto-induced anisotropy in magnetic colloids of superparamagnetic magnetite nanoparticles in an external magnetic field

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Publication details

The article was received on 21 Apr 2017, accepted on 10 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C7SM00795G
Citation: Soft Matter, 2017,13, 4080-4087
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    Magneto-induced anisotropy in magnetic colloids of superparamagnetic magnetite nanoparticles in an external magnetic field

    S. V. Kredentser, M. M. Kulyk, V. M. Kalita, K. Y. Slyusarenko, V. Yu. Reshetnyak and Yu. A. Reznikov, Soft Matter, 2017, 13, 4080
    DOI: 10.1039/C7SM00795G

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