MODE OF DRYING THE NANOPARTICLES AND IT’S STABILITY OF THE FERROFLUIDS

Abstract

Bare and oleic acid capped magnetite nanoparticles were obtained by coprecipitation method. Ferrofluids were prepared by dispersing bare and oleic acid capped magnetite (dried at room temperature and 80 ^oC) nanoparticles in H₂O and ethylene glycol (EG). Ferrofluids prepared by non-polar solvent i.e. ethylene glycol is found to be more stable than the one prepared by a polar solvent. Among the ferrofluids prepared in EG, the oleic acid capped nanoparticles dried at 80 ^oC settles in less interval of time. The interaction of the nanoparticles resulting to agglomeration is discussed in details.