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Magnetic properties of acrylic UV-cured films containing magnetite nanoparticles

Published online by Cambridge University Press:  11 March 2011

Alessandro Chiolerio
Affiliation:
Physics Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, IT-10129, Torino, Italy
Paolo Allia
Affiliation:
Materials Science and Chemical Engineering Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, IT-10129, Torino, Italy
Paola Tiberto
Affiliation:
Electromagnetism Division, INRiM, Strada delle Cacce 91 IT-10135, Torino, Italy
Lorenza Suber
Affiliation:
Istituto di Struttura della Materia, CNR-Area della ricerca di Roma 1, Via Salaria km 29.500 IT-00015, Monterotondo Stazione, Italy
Giada Marchegiani
Affiliation:
Materials Science and Chemical Engineering Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, IT-10129, Torino, Italy Istituto di Struttura della Materia, CNR-Area della ricerca di Roma 1, Via Salaria km 29.500 IT-00015, Monterotondo Stazione, Italy
Marco Sangermano
Affiliation:
Materials Science and Chemical Engineering Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, IT-10129, Torino, Italy
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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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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References

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