Thermomagnetic characterization of organic-based ferrofluids prepared with Ni ferrite nanoparticles

BERCOFF, P.G; ARANA, M.; JACOBO, S.E

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 p. 1 - 8

0921-5107

In this work, a thermomagnetic characterization of kerosene-based ferrofluids (FFs) prepared with Ni-ferrite nanoparticles (NPs) is performed by measuring their thermal conductivity and diffusivity coeffi-cient enhancements. The particles were synthesized by high-energy ball milling, as an alternative tothe most commonly chosen NPs synthesis methods for FFs. The action of an applied magnetic field onthe FF increases the thermal conductivity and diffusivity due to cooperation between the NPs, as itagglomerates them favoring chain-like and clusters formations. It was found that the heat capacity ofthe studied FFs decreases under the application of a magnetic field. The obtained results for thermal con-ductivity of FFs under magnetic fields were fitted by a gas-compression model that considers NPsagglomerates in the fluid.