Nanosized iron oxide particles have multiple practical applications, for example, in drug delivery, magnetic hyperthermia, magnetic resonance imaging, pigments, and photocatalysis [1]. The magnetic nanofluid, ferrofluid, behaves as a smart fluid due to some of its unique features. They have some applications in a variety of fields such as electronic packing, mechanical engineering, aerospace, and bioengineering [2,3]. Although the magnetic properties of the magnetic nanofluids are the subject of intensive studies, there are few data in the literature concerning their thermal and rheolegical properties. The first goal of the present study is to investigate the effect of both temperature and volume fraction on the thermal conductivity of Fe3O4-water nanofluids. For this purpose, we were synthesized Fe3O4 nanoparticles by co-precipitation method. The second aim of this work is to measure the viscosity of Fe2O3-glycerol nanofluids as a function of temperature, volume fraction, and shear rate. For this purpose, we were synthesized Fe2O3 nanoparticles with solvothermal route.

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