Síntese e caracterização de Microesferas (PMMA) Superparamagnéticas via polimerização em suspensão

Abstract

Magnetic nanoparticles has found many applications in biomedical and technological areas. The objective of this work is the preparation and characterization of PMMA microspheres containing NMPs mainly composed of magnetite (Fe₃O₄). For the preparation of NMPs coated with oleic acid was used for coprecipitation technique in an aqueous medium. For the preparation of the microspheres used the technique of suspension polymerization and its size was estimated size of approximately 150µm having a spherical morphology, visualized under a light microscope. From the analysis of Gel Permeation Chromatography (GPC) determined the number average molecular weight (Mw) of the magnetic microspheres. One can observe a variation of the Mw depending on the concentration of Fe₃O₄. To analyze the magnetic properties used the vibrating sample magnetometer (MAV). The microspheres showed superparamagnetic properties and a value of saturation magnetization (Ms) of about 8 emu/g of Fe₃O₄. Therefore we may conclude that it is possible to obtain microspheres with superparamagnétic properties for a determined application, such as, biomedical or technology.