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

Magnetic field effects on electronucleation kinetics J.-P. Chopart, A.-L. Daltin DTI URCA, BP 1039, 51687 Reims Cedex2, France E-mail: jp.chopart@univ-reims.fr   Magnetic field effects on electrochemical processes have been highlighted for many years. Most often, the superimposed magnetic field acts by convective effects on species that are under mass control. The involved forces are depending on the cell geometry: Lorentz force arises for electrode surfaces parallel to the magnetic field and magnetic forces can be efficient on paramagnetic species gradients when the magnetic field is oriented in a direction parallel to the electrochemical current lines. As it has been mentioned in many previous papers, a superimposed magnetic field can modify composition and morphology of electrodeposits and these effecet can be attributed to classical magneto-convection and therefore increase of chemical species adsorption (e.g. brightener). If the above forces can be easily discriminated for macro and microelectrodes, in the case of nanomaterials the problem can be trickier; that is the case for the electrocrystallization of materials at the very first moments of the electronucleation. The present work reports on magnetic effects that have been proved by transient measurements (chronoamperometry) and microscopy imaging (SEM) during electronucleation of copper oxide Cu2O. Our experiments highlight the magnetic field effect is active for nucleus size smaller than 1 µm.

 
 
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