Communication—Visualization of Magnetohydrodynamic Micro-Vortices with Guanine Micro-Crystals

Mogi, Iwao; Iwasaka, Masakazu; Aogaki, Ryoichi; Takahashi, Kohki

doi:10.1149/2.0711709jes

Cited by 16 publications

(13 citation statements)

References 13 publications

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“…The typical surface morphology caused by the micro-MHD vortices is micro-circles [ 12 ] or network structures [ 13 ]. The morphologies in Figure 2 a,b indicate the existence of multi-scale micro-MHD vortices, as shown in Figure 2 c. Such multi-scale vortices were suggested by the visualization study of micro-MHD vortices using light-reflecting guanine micro-crystals as a fluid tracer [ 14 ]. The surface morphologies of the MEE films prepared with chloride additives were similar to those without additives.…”

Section: Resultsmentioning

confidence: 97%

Chiral Symmetry Breaking in Magnetoelectrochemical Etching with Chloride Additives

2017

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Magnetoelectrolysis (electrolysis under magnetic fields) produces chiral surfaces on metal thin films, which can recognize the enantiomers of amino acids. Here, the chiral surface formation on copper films is reported in magnetoelectrochemical etching (MEE) at 5T with chloride additives. In the absence of additives, the surface chirality signs of MEE films depended on the magnetic field polarity. On the contrary, the MEE films prepared with the additives exhibited only d-activity in both magnetic field polarities. This result implies that the specific adsorption of chloride additives induces the chiral symmetry breaking for the magnetic field polarity.

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Section: Resultsmentioning

confidence: 97%

Chiral Symmetry Breaking in Magnetoelectrochemical Etching with Chloride Additives

2017

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“…The chiral surface formation in the MED processes takes place at the configuration where the imposed magnetic field is perpendicular to the working electrode surface. Figure 1 shows two types of MHD flows around the electrode [38][39][40]. With the elapse of time during electrodeposition, the non-equilibrium fluctuation causes bumps and pits on the film surfaces.…”

Section: Introductionmentioning

confidence: 99%

Breaking of Odd Chirality in Magnetoelectrodeposition

et al. 2022

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Electrodeposition under magnetic fields (magnetoelectrodeposition; MED) can induce surface chirality on copper films. The chiral signs of MED films should depend on the magnetic field polarity; namely, the reversal of the magnetic field causes the opposite chiral sign. This represents odd chirality for the magnetic field polarity. However, odd chirality was broken in several MED conditions. This paper makes a survey of breaking of odd chirality in the MED conditions such as low magnetic fields, specific adsorption of chloride ions, micro-electrode, and cell rotation. These results indicate that the ordered fluctuation of magnetohydrodynamic micro-vortices induces the breaking of odd chirality and that the random fluctuation results in the disappearance of surface chirality.

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“…The second type is micro-MHD vortices around the local bumps. Both types of MHD flows were visualized in the silver MED experiments using light-reflecting guanine particles as a fluid tracer [8],…”

Section: Introductionmentioning

confidence: 99%

“…Magnetochemistry 2018, 4, x FOR PEER REVIEW 2 of 9 fluid tracer [8], and the existence of micro-MHD vortices was also confirmed by a lot of circular structures on the MED copper film surfaces [3]. In the electrodeposition, a lot of screw dislocations emerge on the growing surfaces [9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Vertical Magnetohydrodynamic Flows on Chiral Surface Formation in Magnetoelectrolysis

et al. 2018

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Magnetoelectrolysis (electrolysis in magnetic fields) has potential to produce chiral surfaces on metal films. The Lorentz force causes two types of magnetohydrodynamic (MHD) flows; a vertical MHD flow and micro-MHD vortices, and the combination of these MHD flows has been considered to produce chiral surfaces. This paper shows the effects of vertical MHD flow on the chiral surface formation in magnetoelectrodeposition (MED) and magnetoelectrochemical etching (MEE) of copper films. To control the vertical MHD flows the working electrode was embedded in a tube wall with various heights of 2–12 mm, and the vertical MHD flows were expected to penetrate into the tubes with damping. In both MED and MEE experiments, the surface chirality diminished considerably at the wall height of 12 mm. When the penetrating MHD flow could not reach the electrode surface in the sufficiently tall wall, such an MHD flow could not affect the micro-MHD vortices. These results demonstrate that the vertical MHD flow plays a significant role in symmetry breaking of micro-MHD vortices.

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Communication—Visualization of Magnetohydrodynamic Micro-Vortices with Guanine Micro-Crystals

Cited by 16 publications

References 13 publications

Chiral Symmetry Breaking in Magnetoelectrochemical Etching with Chloride Additives

Chiral Symmetry Breaking in Magnetoelectrochemical Etching with Chloride Additives

Breaking of Odd Chirality in Magnetoelectrodeposition

Effects of Vertical Magnetohydrodynamic Flows on Chiral Surface Formation in Magnetoelectrolysis

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