Synthesis and characterization of water based NiFe2O4 ferrofluid

Abstract

Highly stable NiFe2O4 ferrofluids were successfully prepared by two step method. The magnetic NiFe2O4 nanoparticles were prepared by sol-gel auto combustion method. In order to prepare ferrofluid distilled water was used as a base fluid. The X-ray diffraction (XRD), Scanning electron microscopy (SEM) was used to characterize structure and morphology of the nanoparticles. XRD results show the single phase spinel structure with crystallite of 27nm. Electrical conductivity of ferrofluids was measured by Aqua Pro Electrical Conductivity (EC) meter. Density of ferrofluids was measured by specific gravity bottle. Electrical conductivity and density of the ferrofluids were measured as a function of volume fraction. It is observed that, the electrical conductivity and density of ferrofluids increases with increase in volume fraction.