Oscillatory Copper Deposition on Conical Iron Electrodes in a Nonuniform Magnetic Field
Oscillatory Copper Deposition on Conical Iron Electrodes in a Nonuniform Magnetic Field
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DOI：
10.3390/magnetochemistry7040046
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发表时间：
2021-03
期刊：
影响因子：
2.7
通讯作者：
G. Marinaro;Mengyuan Huang;G. Mutschke;Xuegeng Yang;K. Eckert
中科院分区：
文献类型：
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作者：
G. Marinaro;Mengyuan Huang;G. Mutschke;Xuegeng Yang;K. Eckert
我们报告了磁场对铜离子在圆锥形铁探针上沉积的影响。在我们的装置中，磁力和浮力是影响电解质流动和传质的关键因素。在没有外部电流的情况下，铁锥上的铜会自发还原，称为无电沉积。Mach-Zehnder和差分干涉法表明在锥附近的铜离子的浓度的变化。经过约60 s的初始瞬态后，在磁场的作用下，发现在铜浓度的时间振荡。在恒电流条件下，观察到电解质浓度的类似振荡行为。数值模拟结果表明，磁梯度、洛仑兹力和浮力相互作用引起振荡，并根据这一机理对振荡频率进行了解析估计.此外，我们提出了一个研究的振荡频率为无电和恒电流条件下，不同的电流密度。这项研究的结果可能会刺激未来的研究，旨在局部控制的沉积速率和实现小型化，定期结构的存款使用磁场。
We report the effect of a magnetic field on the deposition of copper ions on a conically shaped iron probe. In our setup, the magnetic forces and buoyancy are the key factors influencing the electrolyte flow and the mass transfer. Without external current, a spontaneous reduction of copper on the iron cone occurs, known as electroless deposition. Mach–Zehnder and differential interferometry indicate a variation in the concentration of copper ions near the cone. After an initial transient of about 60 s, temporal oscillations in the copper concentration are found under the effect of a magnetic field. In galvanostatic conditions, a similar oscillatory behavior of the concentration of the electrolyte is observed. Numerical simulations show that the oscillations are caused by the magnetic gradient, Lorentz force, and buoyancy force counteracting one another, and the oscillation frequency is estimated analytically based on this mechanism. Furthermore, we present a study on the oscillation frequency for both electroless and galvanostatic conditions with different current densities. The results of this study may stimulate future research aimed at the local control of the deposition rate and the realization of miniaturized, regularly structured deposits using magnetic fields.