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ELECTRODEPOSITION OF NICKEL-ALUMINA NANOCOMPOSITE FILMS UNDER THE INFLUENCE OF STATIC MAGNETIC FIELD Ralf Peipmann, Andreas Bund Institute of Physical Chemistry and Electrochemistry, Technische Universitat Dresden D-01062 Dresden, Germany |
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In this work the incorporation of 13 nm alumina particles into a nickel matrix was studied under the influence of a static magnetic field (up to 700 mT). Two field configurations were investigated: perpendicular and parallel electric and magnetic fields. The codeposition experiments were carried out galvanostatically. The quartz crystal microbalance (QCM) was used to characterize the deposition in-situ by evaluating the current efficiency (mass load of the quartz). For comparison EDX analysis was conducted after the deposition experiments and to determine the particle content.
For perpendicular fields a magnetohydrodynamic effect ws found which leads to a convection in the quiescent solution. This convection stabilizes the particles in the solution (less sedimentation) and thus enhances the transport of particles. For parallel fields no such effect was observed.
A second focus was laid on the surface of the particles by covering them with a nickel shell before codeposition. It was supposed that an additional effect can be observed because of a magnetophoretic drag.