Bund A, Kuehnlein H H
Institute of Physical Chemistry and Electrochemistry, Dresden University of Technology, D-01062 Dresden, Germany.
J Phys Chem B. 2005 Oct 27;109(42):19845-50. doi: 10.1021/jp053341d.
The effect of an external magnetic field (up to 0.8 T) on the anodic dissolution of microstructures has been investigated systematically. Copper and silver wires (100 microm in diameter) were embedded in epoxy resin and dissolved potentiostatically while a magnetic field was periodically switched on and off. A special feature of the thus prepared structures is that they show a smooth transition from an inlaid disk to a recessed disk electrode. An increase or a decrease of the limiting current density in the presence of B was found depending on the orientation of the magnetic field and the hydrodynamic conditions in the cell (natural or forced convection). The magnetic forces which are responsible for this are the Lorentz force and the gradient force. We propose a model which discusses the interaction of these forces with the natural and the forced convection to explain the experimental results.
系统研究了外部磁场（高达0.8 T）对微观结构阳极溶解的影响。将直径为100微米的铜丝和银丝嵌入环氧树脂中，并在磁场周期性地开启和关闭时进行恒电位溶解。如此制备的结构的一个特殊之处在于，它们显示出从镶嵌盘到凹陷盘电极的平滑过渡。发现在存在磁场B的情况下，极限电流密度会根据磁场方向和电解槽中的流体动力学条件（自然对流或强制对流）而增加或降低。对此负责的磁力是洛伦兹力和梯度力。我们提出了一个模型，该模型讨论了这些力与自然对流和强制对流的相互作用，以解释实验结果。
