Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 

Saved Queries

Sign in to use this feature.

Search Filter Reset All

Years

Between: -

Subjects

remove_circle_outline
remove_circle_outline
Add Subjects Reset
Select Subjects

Journals

remove_circle_outline
Add Journals Reset
Select Journals

Article Types

remove_circle_outline
remove_circle_outline
Add Article Types Reset
Select Article Types

Countries / Regions

remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
Add Countries / Regions Reset
Select Countries / Regions
Update Search
share announcement

Search Results (10)

Search Parameters:
Keywords = magnetoelectrodeposition

Order results
Result details
Results per page
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
49 pages, 5094 KiB  
Article
The Origin of Homochirality by Rotational Magnetoelectrochemistry
by Ryoichi Morimoto, Iwao Mogi, Miki Miura, Atsushi Sugiyama, Makoto Miura, Yoshinobu Oshikiri, Kohki Takahashi, Yusuke Yamauchi and Ryoichi Aogaki
Magnetochemistry 2025, 11(6), 51; https://doi.org/10.3390/magnetochemistry11060051 - 19 Jun 2025
Viewed by 331
Abstract
The origin of homochirality by rotational magnetoelectrochemistry was theoretically examined. Electrochemical reductions in a rotating solution under a static vertical magnetic field were concluded to yield microscopic vortices with L-activity for enantiomeric reagents, whereas D-active vortices arise from electrochemical oxidation. The reduction case [...] Read more.
The origin of homochirality by rotational magnetoelectrochemistry was theoretically examined. Electrochemical reductions in a rotating solution under a static vertical magnetic field were concluded to yield microscopic vortices with L-activity for enantiomeric reagents, whereas D-active vortices arise from electrochemical oxidation. The reduction case was experimentally verified by rotational magnetoelectrodeposition (RMED) of copper films using an electrolysis cell rotating in a magnetic field, where L-active screw dislocations were created by L-active microscopic vortices. In all the cases of the directions of magnetic polarity and system rotation, the RMED films exhibited L-activity for the enantiomeric reactions of amino acids. Full article
►▼ Show Figures

Figure 1

66 pages, 6727 KiB  
Article
Theory of Chiral Electrodeposition by Chiral Micro-Nano-Vortices under a Vertical Magnetic Field -1: 2D Nucleation by Micro-Vortices
by Ryoichi Morimoto, Miki Miura, Atsushi Sugiyama, Makoto Miura, Yoshinobu Oshikiri, Iwao Mogi, Yusuke Yamauchi, Satoshi Takagi and Ryoichi Aogaki
Magnetochemistry 2022, 8(7), 71; https://doi.org/10.3390/magnetochemistry8070071 - 6 Jul 2022
Cited by 4 | Viewed by 2748
Abstract
Remarkable chiral activity is donated to a copper deposit surface by magneto-electrodeposition, whose exact mechanism has been clarified by the three-generation model. In copper deposition under a vertical magnetic field, a macroscopic tornado-like rotation called the vertical magnetohydrodynamic (MHD) flow (VMHDF) emerges on [...] Read more.
Remarkable chiral activity is donated to a copper deposit surface by magneto-electrodeposition, whose exact mechanism has been clarified by the three-generation model. In copper deposition under a vertical magnetic field, a macroscopic tornado-like rotation called the vertical magnetohydrodynamic (MHD) flow (VMHDF) emerges on a disk electrode, inducing the precessional motions of various chiral microscopic MHD vortices: First, chiral two-dimensional (2D) nuclei develop on an electrode by micro-MHD vortices. Then, chiral three-dimensional (3D) nuclei grow on a chiral 2D nucleus by chiral nano-MHD vortices. Finally, chiral screw dislocations are created on a chiral 3D nucleus by chiral ultra-micro MHD vortices. These three processes constitute nesting boxes, leading to a limiting enantiomeric excess (ee) ratio of 0.125. This means that almost all chiral activity of copper electrodes made by this method cannot exceed 0.125. It also became obvious that chirality inversion by chloride additive arises from the change from unstable to stable nucleation by the specific adsorption of it. Full article
(This article belongs to the Special Issue Magnetohydrodynamic Effect in Electrochemical Processes: Magnetoelectrodeposition, Magnetoelectrocatalysis, and Related Studies)
►▼ Show Figures

Figure 1

20 pages, 9469 KiB  
Article
Corrosion Behavior of ZnMn Coatings Magnetoelectrodeposited
by Lamia Allam, Florica S. Lazar and Jean-Paul Chopart
Magnetochemistry 2022, 8(7), 69; https://doi.org/10.3390/magnetochemistry8070069 - 26 Jun 2022
Cited by 1 | Viewed by 2638
Abstract
The zinc–manganese alloy coatings have been obtained without and with superimposition of a 0.3 T magnetic field in a parallel direction to the working surface electrode. The electrodeposition during 30 min, for two applied potentials (E = −1.6 V/SCE and E = −1.8 [...] Read more.
The zinc–manganese alloy coatings have been obtained without and with superimposition of a 0.3 T magnetic field in a parallel direction to the working surface electrode. The electrodeposition during 30 min, for two applied potentials (E = −1.6 V/SCE and E = −1.8 V/SCE) in an electrochemical bath with the (Zn2+)/(Mn2+) concentration ratio equal to 0.5. The structural, the morphological, and the chemical composition characteristics of the deposits have been studied. It has been found that the applied potentials modify the structural properties of the deposits, η phase-rich deposits elaborated for E = −1.6 V/SCE, and MnZn3-rich deposits elaborated for E = −1.8 V/SCE. The magnetohydrodynamic convection favors the manganese content of the deposit. The corrosion behavior of these coatings has been analyzed in 3.5% NaCl solution by free corrosion potential measurements and electrochemical impedance spectroscopy. The different results show that the corrosion resistance of these zinc–manganese alloy coatings is linked to their structure, to their composition, and to the magnetic field amplitude used during the electrodeposition process. Full article
(This article belongs to the Special Issue Magnetohydrodynamic Effect in Electrochemical Processes: Magnetoelectrodeposition, Magnetoelectrocatalysis, and Related Studies)
►▼ Show Figures

Figure 1

14 pages, 4824 KiB  
Review
Breaking of Odd Chirality in Magnetoelectrodeposition
by Iwao Mogi, Ryoichi Morimoto, Ryoichi Aogaki and Kohki Takahashi
Magnetochemistry 2022, 8(7), 67; https://doi.org/10.3390/magnetochemistry8070067 - 23 Jun 2022
Cited by 3 | Viewed by 2020
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Magnetohydrodynamic Effect in Electrochemical Processes: Magnetoelectrodeposition, Magnetoelectrocatalysis, and Related Studies)
►▼ Show Figures

Figure 1

12 pages, 2059 KiB  
Article
Pulse Reverse Plating of Copper Micro-Structures in Magnetic Gradient Fields
by Mengyuan Huang, Margitta Uhlemann, Kerstin Eckert and Gerd Mutschke
Magnetochemistry 2022, 8(7), 66; https://doi.org/10.3390/magnetochemistry8070066 - 22 Jun 2022
Cited by 7 | Viewed by 2537
Abstract
Micro-structured copper layers are obtained from pulse-reverse electrodeposition on a planar gold electrode that is magnetically patterned by magnetized iron wires underneath. 3D numerical simulations of the electrodeposition based on an adapted reaction kinetics are able to nicely reproduce the micro-structure of the [...] Read more.
Micro-structured copper layers are obtained from pulse-reverse electrodeposition on a planar gold electrode that is magnetically patterned by magnetized iron wires underneath. 3D numerical simulations of the electrodeposition based on an adapted reaction kinetics are able to nicely reproduce the micro-structure of the deposit layer, despite the height values still remain underestimated. It is shown that the structuring is enabled by the magnetic gradient force, which generates a local flow that supports deposition and hinders dissolution in the regions of high magnetic gradients. The Lorentz force originating from radial magnetic field components near the rim of the electrode causes a circumferential cell flow. The resulting secondary flow, however, is superseded by the local flow driven by the magnetic gradient force in the vicinity of the wires. Finally, the role of solutal buoyancy effects is discussed to better understand the limitations of structured growth in different modes of deposition and cell geometries. Full article
(This article belongs to the Special Issue Magnetohydrodynamic Effect in Electrochemical Processes: Magnetoelectrodeposition, Magnetoelectrocatalysis, and Related Studies)
►▼ Show Figures

Figure 1

9 pages, 3762 KiB  
Article
Influence of a Constant Perpendicular High Magnetic Field on the Electrodeposition of Calcium Phosphate Coating
by Anne-Lise Daltin and Jean-Paul Chopart
Magnetochemistry 2022, 8(6), 62; https://doi.org/10.3390/magnetochemistry8060062 - 7 Jun 2022
Cited by 5 | Viewed by 2312
Abstract
Calcium phosphate coatings were formed on a Ti6Al4V substrate by electrodeposition under a high magnetic field up to 16 T. The magnetic field was parallelly applied to the vertical surface electrode. Changes in crystal morphology of calcium phosphates were investigated as a function [...] Read more.
Calcium phosphate coatings were formed on a Ti6Al4V substrate by electrodeposition under a high magnetic field up to 16 T. The magnetic field was parallelly applied to the vertical surface electrode. Changes in crystal morphology of calcium phosphates were investigated as a function of the magnetic field amplitude, and the results are discussed in terms of magnetic field effects. Magnetohydrodynamic convection due to the Lorentz force could considerably reduce the formation of volcano-like structures and generate more uniform deposits without changing Ca/P ratios. Full article
(This article belongs to the Special Issue Magnetohydrodynamic Effect in Electrochemical Processes: Magnetoelectrodeposition, Magnetoelectrocatalysis, and Related Studies)
►▼ Show Figures

Graphical abstract

9 pages, 2572 KiB  
Article
Breaking of Odd Chirality in Magnetoelectrodeposition of Copper Films on Micro-Electrodes
by Iwao Mogi, Ryoichi Aogaki and Kohki Takahashi
Magnetochemistry 2021, 7(11), 142; https://doi.org/10.3390/magnetochemistry7110142 - 27 Oct 2021
Cited by 4 | Viewed by 2403
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 [...] Read more.
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. Full article
►▼ Show Figures

Figure 1

9 pages, 3346 KiB  
Article
Fluctuation Effects of Magnetohydrodynamic Micro-Vortices on Odd Chirality in Magnetoelectrolysis
by Iwao Mogi, Ryoichi Aogaki and Kohki Takahashi
Magnetochemistry 2020, 6(3), 43; https://doi.org/10.3390/magnetochemistry6030043 - 10 Sep 2020
Cited by 12 | Viewed by 2364
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. [...] Read more.
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. Full article
►▼ Show Figures

Figure 1

8 pages, 1799 KiB  
Article
Surface Chirality in Rotational Magnetoelectrodeposition of Copper Films
by Iwao Mogi, Ryoichi Morimoto, Ryoichi Aogaki and Kohki Takahashi
Magnetochemistry 2019, 5(3), 53; https://doi.org/10.3390/magnetochemistry5030053 - 12 Sep 2019
Cited by 12 | Viewed by 2825
Abstract
Chiral surface formation was investigated in rotational magnetoelectrodeposition (RMED) of copper films, where an electrochemical cell was rotated in magnetic fields. The RMED was conducted with clockwise or anticlockwise rotation in the magnetic fields parallel or antiparallel to the ionic currents. The rotational [...] Read more.
Chiral surface formation was investigated in rotational magnetoelectrodeposition (RMED) of copper films, where an electrochemical cell was rotated in magnetic fields. The RMED was conducted with clockwise or anticlockwise rotation in the magnetic fields parallel or antiparallel to the ionic currents. The rotational frequencies were 0.5–6 Hz, and the magnetic fields were 2–5 T. The chiral behaviors are divided into four types: type I has chirality depending on the magnetic field polarity, type II has chirality depending on the rotational direction, and type III has chirality depending on both directions. Type IV represents chiral symmetry breaking, where the RMED films exhibit only L activity in any magnetic field polarity and rotational direction. Full article
(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)
►▼ Show Figures

Figure 1

9 pages, 2914 KiB  
Article
Effects of Vertical Magnetohydrodynamic Flows on Chiral Surface Formation in Magnetoelectrolysis
by Iwao Mogi, Ryoichi Morimoto, Ryoichi Aogaki and Kohki Takahashi
Magnetochemistry 2018, 4(3), 40; https://doi.org/10.3390/magnetochemistry4030040 - 6 Sep 2018
Cited by 8 | Viewed by 4154
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Magnetic Fields in Microfluidic Systems)
►▼ Show Figures

Graphical abstract

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying article 1-50 on page 1 of 1.
Back to TopTop