Magnetic properties of acrylic UV-cured films containing magnetite nanoparticles
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Magnetic properties of acrylic UV-cured films containing magnetite nanoparticles Alessandro Chiolerio1, Paolo Allia2, Paola Tiberto3, Lorenza Suber4, Giada Marchegiani2,4 and Marco Sangermano2 1 Physics Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, IT-10129, Torino, Italy 2 Materials Science and Chemical Engineering Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, IT-10129, Torino, Italy 3 Electromagnetism Division, INRiM, Strada delle Cacce 91 IT-10135, Torino, Italy 4 Istituto di Struttura della Materia, CNR-Area della ricerca di Roma 1, Via Salaria km 29.500 IT-00015, Monterotondo Stazione, Italy ABSTRACT Acrylic based films containing thermo-chemically synthesized magnetite nanoparticles (NPs) were prepared by UV-curing. A stable dispersion of Fe3O4 NPs in n-hexane was added to polyethylene glycol diacrylate (PEGDA) oligomer or to hexanediol diacrylate (HDDA) oligomer, producing a blend whose viscosity matches the processing requirements for inkjet printing technology. Morphologic characterization is provided by means of Field Effect SEM on a representative nanocomposite section. By real-time FT-IR analysis it was shown that Fe3O4 NPs are able to initiate radical chain-grown polymerization under UV light, for what concerns the HDDA matrix. Tight cross-linked transparent polymeric films were obtained after 1 minute of UV irradiation. The magnetic properties of the produced films were studied by means of an Alternating-Gradient Force Magnetometer (AGFM) in the temperature range 10 – 300 K and up to 18 kOe. The isothermal magnetization curves of both HDDA and PEGDA -based nanocomposites showed that these hybrid systems must be described as interacting superparamagnets (ISP) characterized by inter-particle magnetic interactions dominating over intra-particle effects. INTRODUCTION Inorganic nanoparticles (NPs) dispersed within polymer matrices have been potentially exploited for a number of applications, thanks to the new properties originating from the combination of inorganic components and polymers. Polymeric Matrix Nanocomposite materials (PMNCs) containing either metallic or insulating NPs have been prepared to obtain interesting physical (optical [1], conductive [2-4], and magnetic [5-8] properties for use in micro and nanoelectronics. In addition, important contributions to fundamental studies in nanoscale physics have been brought by studying those materials, such as quantum tunneling of magnetization, spin reversal mechanism in single-domain particles and quantum size effects[9–11], while we foresee advanced use of these materials for their magnetoresistance properties. In this case, a liquid ferrofluid containing an oligomer resin and a dispersion of magnetic NPs is made to polymerize by UV curing to form a solid film. Magnetite is a cheap material with a lower degree of toxicity than metallic ferromagnets and can be easily synthesized through a variety of low-cost techniques, such as the thermo-chemical route [12].
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DISCUSSION Preparation of the Magnetite NPs Fe3O4 NP
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