Magnetic Nanocomposites Based on Biodegradable Plastic PVA and Effect of Gamma Irradiation

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As’adi Iranagh, Sima | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43901 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Frounchi, Masoud; Dadbin, Susan
Abstract:
Polyvinylalcohol/magnetite nanocomposite films were fabricated via solution casting. Magnetite (Fe3O4) nanoparticles were prepared by means of co-precipitation method and modified by citric acid. The nanoparticles and nanocomposites were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), vibrating sample magnetometer (VSM), fourier transform infrared spectroscopy (FTIR) and mechanical measurement. The results reveal that magnetite nanoparticles have a spherical shape with an average diameter of 19.7nm and are superparamagnetic at room temperature. The nanoparticles are observed to be uniformly dispersed in the polymer matrix due to a strong interaction between the nanoparticles and the polymer matrix, arising from the hydrogen bonding between the PVA and hydroxyl groups on the nanoparticle surface. We also prepared magnetic hydrogels using the Co60 γ-ray irradiation technique and examined the physical properties of these hydrogels, including gelation, equilibrium water content and gel strength to evaluate the applicability of these hydrogels for biomedical applications
Keywords:
Poly Vinyl Alcohol ; Gamma Irradiation ; Magnetic Nanocomposite

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