Breaking of Odd Chirality in Magnetoelectrodeposition of Copper Films on Micro-Electrodes

Iwao Mogi,Ryoichi Aogaki,Kohki Takahashi

doi:10.3390/magnetochemistry7110142

Iwao Mogi, Ryoichi Aogaki + Show 1 more

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https://doi.org/10.3390/magnetochemistry7110142

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Abstract

The surface chirality was investigated in magnetoelectrodeposition (MED) of copper films on micro-disc electrodes with the diameters of 100 and 25 µm. The MED was conducted in the magnetic fields of 1–5 T, which were parallel or antiparallel to the ionic currents. In the case of 100 µm-electrodes, the MED films prepared in 2 and 3 T exhibited odd chirality for the magnetic field polarity, as expected in the magnetohydrodynamic (MHD) vortex model. However, the films prepared in the higher fields of 4 and 5 T exhibited breaking of odd chirality. In the case of the 25 µm-electrode, the broken odd chirality was observed in 2 and 3 T. These results indicate that the strong vertical MHD flows induce the breaking of odd chirality. The mapping of chiral symmetry on the axes of the magnetic field and electrode diameter demonstrate that the odd chirality could be easily broken by the fluctuation of micro-MHD vortices.

Highlights

The surface chirality of MED films can be reflected in the peak we show that the appearance broken odd chirality currents of enantiomers
The surface chirality of MED films can be reflected in the peak currents of enantiomers
We have shown the ee ratio profiles of copper MED films prepared in various conditions at 1–5 T on the 100 μm- and 25 μm-electrodes and found that the odd chirality for the magnetic field polarity can be broken by the considerable influence of vertical MHD flows on the micro-MHD vortices

Summary

Introduction

100 μm-electrodes, the MED films prepared in 2 and 3 T exhibited odd chirality for the magnetic field polarity, as expected in the magnetohydrodynamic (MHD) vortex model. 25 μm-electrode, the broken odd chirality was observed in 2 and 3 T. These results indicate that the strong vertical MHD flows induce the breaking of odd chirality. The mapping of chiral symmetry on the axes of the magnetic field and electrode diameter demonstrate that the odd chirality could be broken by the fluctuation of micro-MHD vortices. The chiral surface formation in the MED processes is related to the magnetohydrodynamic (MHD) flows and vortices caused by the Lorentz force [7,8].

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