Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid

It is well known that magnetic nanofluids are widely applied in various fields ranging from heat transfer to miniature cooling, and damping sealing, due the mobility magnetism under field. Herein, PFPE-oil based with superior magnetization dispersion stability were obtained via regulating reaction temperature. The structures of particles characterized by X-ray diffraction (XRD) transmission electron microscopy (TEM). size effects on coating effect particles, saturation fluids Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM) density instrument, respectively. results indicate impurity phase FeOOH only appear prepared at 18°C average Fe 3 O 4 nanoparticles reduces 120 20 nm raising increases firstly then increasing particle size, which affected thickness dead layer FeOOH. could be chemically coated PFPE-acids, mass a little size. lowers while decrease At temperature 60°C, 25 obtained. Our control can useful strategy for preparing desirable properties potential applications.