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The magnetic fluids are constituted of maghemite nanoparticles γ-Fe2O3 coated with citrate molecules that ensure them a negative superficial charge. They are dispersed in water at pH 7 with a volume fraction φ ranging from 1% up to 25%. The particle diameters d follow a lognormal distribution characterized here by d0=(<ln d>)=9.8 nm and σ=0.25. The dipolar parameter γ/φ =μ0m2V/KT that quantifies the dipolar interactions between two particles compared to thermal energy, is 32 for this ferrofluid.