Title :
Superparamagnetism of ferrite particles dispersed in spherical polymeric materials
Author :
O´Connor, C.J. ; Lee, Y.-S. ; Tang, J. ; John, V.T. ; Kommareddi, N.S. ; Tata, M. ; McPherson, G.L. ; Akkara, J.A. ; Kaplan, D.L.
Author_Institution :
Dept. of Chem., New Orleans Univ., LA, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
Superparamagnetic iron oxide particles synthesized in water-in-oil microemulsions have been incorporated into a polymer matrix. The microstructured micellar environment provides a template for polymer synthesis, leading to the formation of interconnected polymer particles with spherical morphologies. The resulting iron oxide-polymer composites reveal superparamagnetic properties and low temperature remanence and susceptibility characteristic of a superparamagnet. The results of temperature and field dependent magnetic characterizations of these composites are described. Ultramicrotomed TEM micrographs show that the iron oxide particles (size <100 Å) are uniformly distributed In the polymer microspheres
Keywords :
composite materials; ferrites; magnetic particles; magnetic susceptibility; microemulsions; remanence; superparamagnetism; transmission electron microscopy; Fe oxide-polymer composites; Fe-O; ferrite particles; field dependent magnetic characterizations; interconnected polymer particles; low temperature remanence; microstructured micellar environment; polymer matrix; polymer microspheres; polymer synthesis; spherical morphologies; spherical polymeric materials; superparamagnetism; susceptibility characteristic; temperature dependent magnetic characterizations; ultramicrotomed TEM micrographs; water-in-oil microemulsions; Biochemistry; Chemistry; Composite materials; Crystal microstructure; Ferrites; Iron; Lipidomics; Liquid crystals; Polymers; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
