Eur. Phys. J. E 4, 263-271
Dynamics and correlations in magnetic colloidal systems studied by X-ray photon correlation spectroscopy
J. Lal1, D. Abernathy1, L. Auvray2, O. Diat1 and G. Grübel11 European Synchrotron Radiation Facility, B.P. 220 F-38043 Grenoble Cedex, France
2 Laboratoire Leon Brillouin, CEA-SACLAY, 91191-Gif-Sur-Yvette, Cedex France
jlal@anl.gov
(Received 9 August 1999 and Received in final form 26 July 2000)
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
.
Translational diffusion in zero field and anisotropic diffusion
under external magnetic fields will be discussed.
61.10.Eq - X-ray scattering (including small-angle scattering).
82.70.Dd - Colloids.
83.10.Pp - Particle dynamics.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2001
