What tunes the structural anisotropy of magnetic fluids under a magnetic field?

The Journal of Physical Chemistry. B
G MériguetR Perzynski

Abstract

In the present study, the structure of monophasic ionic magnetic fluids under a static magnetic field is explored. In these aqueous electrostatically stabilized ferrofluids, we vary both the isotropic interparticle interactions and the anisotropic dipolar magnetic interaction by tuning the ionic strength and the size of the nanoparticles. Small angle neutron scattering measurements carried out on nanoparticles dispersed in light water exhibit miscellaneous 2D nuclear patterns under a magnetic field with various q-dependent anisotropies. In this nondeuterated solvent where the magnetic scattering is negligible, this anisotropy originates from an anisotropy of the structure of the dispersions. Both the low q region and the peak of the structure factor can be anisotropic. On the scale of the interparticle distance, the structure is better defined in the direction perpendicular to the field. In the thermodynamic limit (q-->0), the model previously described in ref 10 matches the data without any fitting parameters: the interparticle interaction is more repulsive in the direction parallel to the magnetic field. At low q, the amplitude of the anisotropy of the pattern is governed by the ratio of two interaction parameters: the reduce...Continue Reading

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Citations

Apr 25, 2013·The European Physical Journal. E, Soft Matter·A F C CamposJ Depeyrot
Dec 22, 2009·Journal of Colloid and Interface Science·Grégory Beaune, Christine Ménager
Aug 11, 2015·Soft Matter·E WandersmanR Perzynski
May 23, 2012·The Journal of Chemical Physics·Ekaterina A ElfimovaPhilip J Camp
Aug 13, 2015·The European Physical Journal. E, Soft Matter·Stéphane RogerAlain Ponton
Feb 22, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Elena S MininaSofia S Kantorovich
Jun 7, 2018·Physical Chemistry Chemical Physics : PCCP·R Cabreira GomesR Perzynski
Dec 22, 2007·The Journal of Physical Chemistry. B·Y C JianR Tao

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