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Structural probing of clusters and gels of self-aggregated magnetic nanoparticles

B. Frka-Petesic1 - E. Dubois1 - L. Almasy1 - V. Dupuis1 - F. Cousin2 - R. Perzynski1

1 UPMC PECSA UMR 7195 case 51, 4 place Jussieu, 75005 Paris, France
2 LLB CEA-CNRS UMR 12, CE-Saclay, 91191 Gif-sur-Yvette, France

The microstructure of home-made aqueous magnetic fluids based on maghemite (γ−Fe2O3) and cobalt ferrite (CoFe2O4) nanoparticles is monitored from repulsive on the average towards attractive on the average by tuning the interparticle electrostatic repulsion through modulations of ionic strength and pH. A self-aggregation leading to sols of individual clusters and/or a thixotropic gel phase is induced. Their microstructure under finely controlled physico-chemical conditions is probed in zero field by Small Angle X-ray Scattering and Ultra-Small Angle Neutron Scattering. Tables 1, Figs 5, Refs 40.

Magnetohydrodynamics 49, No. 3/4, 328-338, 2013 [PDF, 1.45 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X