TEM/SEM and FT-IR characterization of biocompatible magnetic nanoparticles

K. Alexandrova (a), I. Markov (a) – Deneva (b), A. Gigova (a), I. Dragieva (a)

(a) Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Sofia, Bulgaria,
(b) University of Chemical Technology and Metallurgy, 1756 Sofia, 8 Kl. Ohridski Blvd., Bulgaria,

Abstract

Fe-Co-Cr-B(N,C,O,H) nanoparticles were synthesized by chemical reduction in aqueous solutions of cobalt precursor complexes such as (ethylenediamine)dichloro cobalt chloride [Co(en)2.Cl2]Cl and aqua solutions of FeCl2.4H2O and CrCl3.6H2O with sodium borohydride as reducing agent. During the synthesis a reactor insuring hydrodynamic conditions of ideal mixing for solutions at a room temperature and atmospheric pressure was used. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Fourier transformation infra red spectroscopy (FT-IR) investigations of nanoparticles obtained were carried out. The influence of the applied d. c. magnetic field during the synthesis on their properties were established. It is visible that a d. c. magnetic field induces a chain arrangement of nanoparticles with higher hydroxide content, possessing higher coercive force and lower transmittance determined by FT-IR.