研究目的
Investigating the effect of a magnetic field on the concentration boundary layer during copper electrodeposition in a copper sulfate solution.
研究成果
The study demonstrated that the presence of a magnetic field affects the concentration profile near the cathode during copper electrodeposition, promoting Cu2+ mass transport and producing large crystal grains. The holographic interferometry technique proved effective for in situ measurement of the concentration profile.
研究不足
The study was limited by the nonuniformity of the magnetic field and the small Lorentz force, which might not be sufficient to change hydrodynamic boundary layer thickness. Additionally, the influence of gravitational convection was minimized but not entirely eliminated due to the quasi two-dimensional nature of the cell.
1：Experimental Design and Method Selection:
The study employed a digital holographic microscope to measure the concentration profile in situ during Cu electrodeposition in a magnetic field. The methodology included the use of a quasi two-dimensional cell configuration to minimize natural convection.
2：Sample Selection and Data Sources:
The anode and cathode were copper foils, each 50 mm thick, polished and washed before use. The electrolyte was prepared from CuSO4 and ultra-pure water without any supporting electrolyte.
3：List of Experimental Equipment and Materials:
Digital holographic microscope (DHM, LynceeTec), potentiostat (HZ-7000, Hokuto Denko Co.), donut-shaped neodymium magnets, copper foils (
4：99%, Nilaco Corp.), CuSO4 (95%, Kanto Chemical Co.). Experimental Procedures and Operational Workflow:
The electrodes were placed facing each other in the quasi two-dimensional cell configuration. The experiment was conducted in constant current mode and controlled via potentiostat at room temperature. The magnetic field was oriented vertically, and its intensity was
5：18 T. Data Analysis Methods:
The recorded holograms were analyzed with Koala software to calculate the concentration profile. The relationships between phase change, refractive index difference, and Cu2+ concentration were used to determine the concentration profile.
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