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Direction-dependent freezing of diamagnetic colloidal tracers suspended in paramagnetic ionic liquids
Christopher Passow1, Birgit Fischer, Michael Sprung
1Institut für Chemie, Universität Rostock , Albert-Einstein-Straße 3a, 18059 Rostock, Germany.
Abstract:
The dynamic behavior of an inverse ferrofluid consisting of diamagnetic, spherical silica particles suspended in the paramagnetic ionic liquid (EMIm)2[Co(NCS)4] is investigated by means of x-ray photon correlation spectroscopy in the presence of an external magnetic field. Dipole-dipole interactions between the diamagnetic holes in the paramagnetic continuum of the suspending medium induce a direction-dependence of the diffusive motion of the colloidal particles: due to a magnetic repulsion perpendicular to the direction of an external field the diffusive motion of the colloidal particles is selectively frozen in this direction.
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