Synthesis and Characterisation of Magnetic Fluids

Abstract

The unusual magnetic properties exhibited by nanoparticles and their promising technological applications have attracted much interest in recent years. The Fe3O4 nanoparticles are used in the preparation of biocompatible and temperature sensitive magnetic fluids for variety of applications in biomedicine and engineering. The aim of the present thesis is to prepare highly stable water and automobile oil based magnetic fluids for medicinal and engineering applications, respectively. This report begins with a detailed description of magnetic fluids and their important applications in chapter 1.Chapter 2 deals with relevant literature review to understand the state of art in the field. The detail methodology of synthesis of nanoparticles and water & oil based magnetic fluids along with various characterization techniques are incorporated in chapter 3. In chapter 4, we have analysed the results obtained from various tests of nanoparticles. Formation of single-phase Fe3O4 nanoparticles at low temperature was confirmed by XRD. It was confirmed from TEM analysis that nanoparticles have near spherical morphology. Magnetization measurement reveals that as the applied magnetic fled increases the saturation magnetization of the sample increases. Both, water and oil based magnetic fluids contain superparamagnetic iron oxide nanoparticles with moderately high saturation magnetization.