Dynamics and correlations in magnetic colloidal systems studied by X-ray photon correlation spectroscopy |
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| Authors: | J. Lal D. Abernathy L. Auvray O. Diat G. Grübel |
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| Affiliation: | (1) European Synchrotron Radiation Facility, B.P. 220 F-38043 Grenoble Cedex, France, FR;(2) Laboratoire Leon Brillouin, CEA-SACLAY, 91191-Gif-Sur-Yvette, Cedex France, FR |
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| Abstract: | We have studied the static and dynamic behaviour of magnetic colloidal systems (ferrofluids) by Small-Angle X-ray Scattering (SAXS) and X-ray Photon Correlation Spectroscopy (XPCS). The main features of the novel XPCS technique will be illustrated by data taken on a model system, colloidal silica spheres. We will then present the results obtained on an optically opaque suspension of magnetic colloids (maghemite) in the wave vector range from 10-3 to 10-2?^-1. Translational diffusion in zero field and anisotropic diffusion under external magnetic fields will be discussed. Received 9 August 1999 and Received in final form 26 July 2000 |
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| Keywords: | PACS. 61.10.Eq X-ray scattering (including small-angle scattering) – 82.70.Dd Colloids – 83.10.Pp Particle dynamics |
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