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Size Distribution of Superparamagnetic Particles Determined by Magnetic Sedimentation

By Jean-François Berret, Olivier Sandre and Alain Mauger

Abstract

International audienceWe report on the use of magnetic sedimentation as a means to determine the size distribution of dispersed magnetic particles. The particles investigated here are (i) single anionic and cationic nanoparticles of diameter D ~ 7 nm and (ii) nanoparticle clusters resulting from electrostatic complexation with polyelectrolytes and polyelectrolyte-neutral copolymers. A theoretical expression of the sedimentation concentration profiles at the steady state is proposed, and it is found to accurately describe the experimental data. When compared to dynamic light scattering, vibrating sample magnetometry, and cryogenic transmission electron microscopy, magnetic sedimentation exhibits a unique property: it provides the core size and core size distribution of nanoparticle aggregates

Topics: [PHYS.COND.CM-SCM] Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], [CHIM.MATE] Chemical Sciences/Material chemistry
Publisher: American Chemical Society
Year: 2007
DOI identifier: 10.1021/la061958w
OAI identifier: oai:HAL:hal-00168505v1
Provided by: Hal-Diderot
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