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Magnetic applications of polymer gels
Author(s) -
López Daniel,
Cendoya Ione,
Mijangos Carmen,
Julià Anna,
Ziolo Ron,
Tejada Javier
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200103)166:1<173::aid-masy173>3.0.co;2-v
Subject(s) - materials science , vinyl alcohol , nanocomposite , polystyrene , coercivity , polymer , saturation (graph theory) , magnetic nanoparticles , magnetic field , nanoparticle , composite material , chemical engineering , nanotechnology , condensed matter physics , physics , mathematics , combinatorics , quantum mechanics , engineering
In this paper we report results of both, material preparation and magnetic characterisation, on CoFe 2 O 4 particles of nanometric size formed by in‐situ precipitation within polymer gels. The size of the particles was controlled within a very narrow volume distribution and its average value was shifted from 2 to 10 nm. The existence of nanoparticles showing, at room temperature, coercive field values between 500 and 900 Oe and saturation magnetisations of about 500 emu/cm 3 , suggest to use these systems to get magnetic recording media with ultra high density. Poly(vinyl alcohol) (PVA) and Polystyrene (PS) films were prepared from this nanocomposite material. After a magnetic field treatment nanoparticles within the PVA films are free to rotate in response to an applied magnetic field. This PVA based nanocomposite film portends a new class of magnetic material with very little or no electrical and magnetic loss.