Laboratoire de Physique et Chimie des Nano-objets

Institut National des Sciences Appliquées
135 avenue de Rangueil, 31077 TOULOUSE CEDEX 4 - FRANCE
Tél : 00 33 05 61 55 96 45 | Fax : (+33) (0)5 61 55 96 97

Partenaires

CNRS
INSA


Choisir la langue du site


          Version Française           English Version

Rechercher

Sur ce site



Accueil du site > LPCNO > Séminaires > 2012 > New electrochemical method to obtain ferrites nanoparticles - Synthesis and characterization

New electrochemical method to obtain ferrites nanoparticles - Synthesis and characterization

Date : 10/05/2012 à 14:00

Titre : New electrochemical method to obtain ferrites nanoparticles - Synthesis and characterization

Intervenant : Eva Mazario

Provenance : Departamento de Química Física Aplicada. Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain

Salle : amphi 112 (salle au 1er étage du bât des amphis)

Résumé :

Cobalt ferrite, CoFe2O4 is especially interesting because of its high coercivity, moderate saturation magnetization, large anisotropy and unique light-induced coercivity change. This is the reason why, in spite of its possible toxicity, this material is under study for many interesting biomedical applications, e.g. drug delivery, DNA separation, magnetic resonance image (MRI) contrast and hyperthermia. Various preparation techniques, such as sol-gel, mechanical milling, hydrothermal, solvothermal, micelles and coprecipitation have been use to produce CoFe2O4 nanoparticles. Although these methods have been improved in the last decade, they may result in very small or coarse particles with a wide size distribution. A new methodology based in the electrochemical synthesis has been developed in our group. The first studies were carried out for the synthesis of magnetite with promise results, now different approaches have been used to obtain uniform cobalt ferrite nanoparticles with good magnetic properties. The advantage of the electrochemical route is the possibility of controlling particle size in a range that is difficult to achieve by other synthesis techniques (between 20-40 nm) and the fact that it is an environmental friendly process. There are many parameters that could affect the size, the stoichiometry of the nanoparticles and the impurities in the final product : These factors are temperature, current density applied to the electrodes and the solution stirring.