Magnetic fluids with tunable interparticle interaction: monitoring the under-field local structure

G. Mériguet¹ - E. Wandersman^1,2 - E. Dubois¹ - A. Cēbers³ - J. de Andrade Gomes^1,4 - G. Demouchy¹ - J. Depeyrot^1,4 - A. Robert⁵ - R. Perzynski¹

¹ UPMC-PECSA-UMR 7195/ case 51, 4 place Jussieu, 75005 Paris, France
² UPMC-LJP-FRE 3231 LPS-ENS, 24 rue Lhomond 75231 Paris, France
³ University of Latvia, 8 Zellu, Riga, LV-1002, Latvia
⁴ Complex Fluids Group, Universidade de Brasilia Instituto de F\`isica, Postal Box 04455, 70919-970, Bras\`ilia-DF, Brazil
⁵ Stanford Linear Acceleretor Center, Stanford University -- LUSI/LCLS, 2575 Sand Hill Road, MS43A, Menlo Park CA 94025, USA

Abstract
Due to a finely tuned interparticle interaction, the microstructure of home-made magnetic fluids based on maghemite (γ−\Fe₂Ø₃) nanoparticles is monitored from attractive on average towards repulsive on average, at low and large volume fractions. The microstructure is probed in zero field and under an applied magnetic field by Small Angle Neutron Scattering and Small Angle X-ray Scattering. Tables 1, Figs 8, Refs 36.