Abstract
Magnetic hydrogel composites of Fe3O4/polyacrylic acid (PAA)/polyvinyl alcohol (PVA) have been successfully fabricated through a freezing-thawing cycle method. The natural iron sand-based Fe3O4 filler nanoparticle has been successfully synthesized through coprecipitation at a room temperature. The crystal structure and the morphology of the Fe3O4 nanoparticle were investigated by using X-ray Diffractometer (XRD), and Transmission Electron Microscopy (TEM), respectively. The study of magnetic characteristics of the Fe3O4/PAA/PVA magnetic hydrogel composites were characterized by using Vibrating Sample Magnetometer (VSM). Based on the quantitative analysis, the morphology of Fe3O4 filler characterized by using TEM has a particle size around of 8 nm. This result was well confirmed with the analysis of the XRD and VSM data. Additionally, the study of the magnetic properties of the Fe3O4/PAA/PVA magnetic hydrogel composites decreased saturation magnetization significantly with the increase of the number of freezing-thawing cycles. This result indicated that the distribution pattern of the Fe3O4 filler in the magnetic hydrogel composites was more optimal when the process of freezing-thawing reached seven times cycles.
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