Synthesis method influence on water based magnetic fluid properties

Water based magnetic fluids containing magnetite have been prepared by a chemical precipitation method. Two samples of tetramethylammonium hydroxide coated magnetic nanoparticles (ultra-fine particles of Fe3O4) immersed in water have been obtained following two different preparation protocols. Physical tests have been performed on these samples of the water based magnetic fluids prepared by us, in order to reveal their microstructural and rheological features. Transmission electron microscopy (TEM) was the investigation method for the assessing of the physical magnetic nanoparticles size. Magnetic susceptibility and magnetization measurements were carried out by Gouy method. Fourier transform infrared absorption spectra have been recorded aiming to get some information on the solid phase structure. The dimensional distribution of the ferrophase physical diameter was comparatively presented using the box-plot statistical method. To assess the optical properties of isolated magnetic nanoparticles, UV-VIS absorbance spectra were recorded.