5th INTERNATIONAL WORKSHOP ON ELECTRODEPOSITED NANOSTRUCTURES 7-9 June 2007, Iasi, Romania	ABSTRACTS

Magnetic polymer nanocomposites by electrodeposition N. Sulitanu, F. Brinza, V. Tura Department of Solid State Physics, Faculty of Physics, "Alexandru Ioan Cuza" University, 700506 Iasi, Romania E-mail: sulitanu@uaic.ro In recent years progress has been achieved in elaboration of various types of polymer nanocomposites and in the understanding of the basic principles which determine their optical, electronic and magnetic properties. Polymer nanocomposites represent a new alternative to conventionally filled polymers with improved physic-chemical properties with very high potential application in electronics, magnetic devices, as biomedical material and in environmental protection. Magnetic polymer nanocomposites are materials in which nanoscopic magnetic particles, typically 10-100 A in at least one dimension, are dispersed in an organic polymer matrix in order to dramatically improve the performance properties of the polymer. Magnetic phenomena, such is superparamagnetism, observed in polymer nanocomposites containing Fe3O4 nanoparticles is some ranges of concentrations, particles size, shapes and temperatures, provide a way to determine the limits to magnetic media storage density, a problem which has been investigated over the last ten years. Two principal ways are used for build a nanostructured material: the mixture of components is suitable for packaging in a short-range atomic order or the components are forced to be structured using a matrix at nanoscale dimension. The second way have been developed in various manners, e.g. nanolitographic methods or filling the pores at nanoscale dimensions of various membranes, like PET [1], PMMA etc.     Fig. 1. (a) SEM micrograph image of Fe-Co nanoparticles dispersed in PET membrane [2]; (b) TEM micrograph image of Fe2O3 nanoparticles in PMMA membrane [3]. In this paper we refer to magnetic properties of some new nanocomposited polymers obtained using electrochemical method and two-steps co-precipitation of some ferrimagnetic and hard/magnetic materials. The used templates were nanoporous polyethylene membranes and nanofibrous polyurethane membranes. Both materials present nanoclusters of magnetic materials included in their structure. Controlling dimensional parameters and porosity of templates, magnetic properties can be tuned properly. References [1] N. Sulitanu, F. Brinza, Romanian Patent (Porous membrane obtaining technology) nr. 113190/1999, BOPI 8 (1999). [2] N. Sulitanu, F. Brinza, Bul. Inst. Polit. "Gh. Asachi" Iasi, Tomul LII (LVI), Fasc. 1-2, Sect.:Math., Mech. & Phys., 127-132 (2006). [3] D. Volath, D.V. Szabo, J. Nanoparticle Research 1, 235 (1999).

 
 
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