The concentration dependence of the susceptibility of aggregate-free ferrofluids was investigated. The ferrofluids consisted of oleic-acid-grafted magnetite particles in cyclohexane. One of the samples contained strongly interacting particles (interaction strength of approximately 5 kT ). Qualitatively, the measurements are in agreement with theoretical predictions on dipolar hard-sphere fluids: dipolar interactions raise the susceptibility above the ideal (Langevin) susceptibility, and when plotted as a function of the Langevin (ideal) susceptibility, the measurements on the two samples are very similar. Quantitatively, theoretical predictions overestimate the experimental susceptibilities at higher ferrofluid concentrations.
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Ewijk et al. (2002) studied this question.
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