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Thermal conductivities of ferrofluids CoFe2O4/water, gama-Fe2O3/water and gama- Fe2O3/n-decane

Magnetic nanoparticles CoFe2O4 and gama-Fe2O3 (8-15• 10-9 m) have been dispersed in liquid carriers water and n-decane. Thermal conductivities of such produced ferrofluids were measured at 25 °C in magnetic field and they decrease with field strength increasing up to 2-3• 10-2 T, which is followed by near field independence at higher fields. An importance of the field dependent thermal conductivity of ferrofluids is discussed in terms of application suitability in the loudspeakers.

nanoparticles CoFe2O4 and gama-Fe2O3; ferrofluids; thermal conductivity; loudspeaker; Stokes-Einstein diffusion

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