Collinear mirage effect measurement of the thermal diffusivity in ferrofluids

Thermal diffusivity results obtained for different concentrations of the sa me ferrofluid are reported. The collinear mirage technique was used for its adequacy in obtaining the thermal properties of semitransparent materials with low thermal diffusivities. The results show that, as the ferrofluid co ncentration increases, the thermal diffusivity also increases, leading to a different trend compared to those reported for ferronematics. The differen t behaviors observed can be related to the different geometries of thermal waves propagating through the material.