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Comparative study of hybrid nanostructures of polymermagnetic nanoparticles

R. TURCU1,* , A. NAN1, I. CRACIUNESCU1, J. LIEBSHER2, O. PANA1, D. BICA3, L.VEKAS3, C. MIJANGOS4

Affiliation

  1. National Institute for Research and Development of Isotopic and Molecular Technologies, P.O.Box 700, Cluj-Napoca 5, 400293 Romania
  2. Institut fur Chemie, Humbold-Universitat Berlin, 12489 Berlin
  3. Romanian Academy, Timisoara Branch, Magnetic Fluids Laboratory, Timisoara, Romania
  4. Instituto de Ciencia y Tecnología de Polímeros, CSIC, 28006 Madrid, Spain

Abstract

In this work we focus on the hybrid nanostructures magnetic-polymer obtained by the combination of Fe3O4 ferrofluid (FF) with either a conducting polymer like polypyrrole (PPy) or an insulating polymer like polyvinyl alcohol (PVA). Magnetic composites with different morphology were obtained: (i) as core-shell nanostructures with Fe3O4 as the magnetic core and PPy as the shell; (ii) as ferrogels, by the dispersion of Fe3O4 nanoparticles into PVA matrix. The novel core-shell hybrid nanostructures, consisting in the deposition of a conjugated polymer shell (polypyrrole or functionalized pyrrole copolymers) covering the magnetic core were prepared by chemical oxidative polymerization of the monomer in aqueous solution containing the ferrofluid. Several synthesis parameters (oxidant/monomer ratio, unsubstituted pyrrole/substituted pyrrole ratio, magnetic nanofluid/monomer ratio, polymerization time) were varied in order to tailor the properties of magneticcopolymer nanocomposites. The synthesis of PVA ferrogels has been carried out mixing corresponding amounts of Fe3O4 ferrofluid and aqueous PVA solution. The properties of the magnetic-polymer hybrid nanostructures were investigated by TEM, HRTEM, FTIR spectroscopy, thermogravimetric analysis (TGA) and magnetization measurements. A comparative study of the nanostructure-properties relationship for hybrid magnetic-polymer composites prepared in different synthesis conditions is reported..

Keywords

Conducting polymer, Magnetic nanoparticles, Hybrid nanostructures.

Submitted at: Feb. 25, 2008
Accepted at: Aug. 28, 2008

Citation

R. TURCU, A. NAN, I. CRACIUNESCU, J. LIEBSHER, O. PANA, D. BICA, L.VEKAS, C. MIJANGOS, Comparative study of hybrid nanostructures of polymermagnetic nanoparticles, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2237-2243 (2008)