Abstract
The magnetic field dependence of chiral surface formation was investigated in magnetoelectrodeposition (MED) and magnetoelectrochemical etching (MEE) of copper films. The MED and MEE was conducted in magnetic fields of up to 5 T, which were parallel or antiparallel to the ionic currents. The MED films prepared in high magnetic fields of 5 and 3 T exhibited odd chirality for magnetic field polarity, as expected on the basis of the magnetohydrodynamic (MHD) vortex model. However, the films prepared in the lower fields of 2.5 and 2 T exhibited breaking of odd chirality. Similar magnetic field dependence was observed in the surface chirality of MEE films. These results imply that the fluctuation in the self-organized state of micro-MHD vortices is responsible for the breaking of odd chirality.
Highlights
In biomolecular systems, L-amino acids are active, whereas D-amino acids are inactive
The magnetic field polarity determines the direction of vertical MHD flow
We have demonstrated that magnetoelectrochemical etchingstates (MEE)during produces surfaces
Summary
L-amino acids are active, whereas D-amino acids are inactive. In the molecular evolution towards the birth of life, surfaces of minerals could serve as catalysts in the formation of amino acids under the oceans on the early earth [1,2]. If such catalytic surfaces were chiral, the chiral symmetry would be broken between the enantiomers of amino acids. The micro-MHD vortices could contribute to the chiral surface formation through the screw dislocation growth [10]. The micro-MHD state has both clockwise and anticlockwise vortices such that the adjoining vortices never conflict with each other Such a symmetrical state can be broken by the vertical MHD flow. The chiral sign of the film surface becomes opposite when the magnetic
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