Application of vertical micro-disk MHD electrode to the analysis of heterogeneous magneto-convection

Sugiyama, Atsushi; Hashiride, Makoto; Morimoto, Ryoichi; Nagai, Yutaka; Aogaki, Ryoichi

doi:10.1016/j.electacta.2004.06.024

Cited by 41 publications

(35 citation statements)

References 20 publications

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“…The asymmetric peak current with i pa < |i pc | suggests that the inhomogeneity of the magnetization of the solution also should be taken into account under homogeneous magnetic fields, in addition to the contribution of the MHD effect, which appears even under the perpendicular magnetic field [21], and the magnetoconvection due to the local magnetic field gradient around the electrode. The chemical potential gradient in a solution causes the diffusion of redox species.…”

Section: Discussionmentioning

confidence: 99%

“…Au electrodes were activated by applying a scanning electric potential using the CV equipment in 1 M aqueous KNO 3 solutions containing K 3 [Fe(CN) 6 ] ([Fe(CN) 6 ] 3− solutions), followed by washing with water and drying under N 2 . The Au electrode was covered with a 5-mm-long Teflon sleeve to avoid MHD convection [21]. Several µl of an aliquot of 1000 ppm DODAC in CHCl 3 was added dropwise to the Au electrode surface, and the electrode was then placed in 0.2 M KCl to form a DODAC monolayer on the electrode surface.…”

Section: Methodsmentioning

confidence: 99%

“…The magneto-convection affects the diffusion processes of redox species when an inhomogeneous magnetic field is applied, even when it is parallel to the electrolytic current. Sugiyama et al detected the spin effect using a local magnetic field gradient and a special electrode, and carried out a quantitative analysis to obtain the magnetic parameters [21].…”

Section: Introductionmentioning

confidence: 99%

“…Aogaki et al studied the MHD effect quantitatively by analyzing the flow of electrolyte solutions between electrodes [16]. The increase in electrolytic current under a steady magnetic field, however, arises from not only MHD effects but also magneto-convection, which may arise from the concentration gradient of the magnetic susceptibility under an inhomogeneous magnetic field or magnetic field gradient [17][18][19][20][21]. The magneto-convection affects the diffusion processes of redox species when an inhomogeneous magnetic field is applied, even when it is parallel to the electrolytic current.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field effects on electric behavior of [Fe(CN)₆]³⁻at bare and membrane-coated electrodes

Saravanan¹,

Fujio²,

Ozeki³

2008

Science and Technology of Advanced Materials

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The cyclic voltammetric behavior of [Fe(CN) 6 ] 3− was investigated under homogeneous magnetic fields perpendicular to the electrode surface in order to determine the effects of magnetic fields on the distribution of an Fe 2+ /Fe 3+ redox couple. The cathodic current was enhanced much more than the anodic current by a homogeneous magnetic field, suggesting that the concentration gradient of paramagnetic [Fe(CN) 6 ] 3− and diamagnetic [Fe(CN) 6 ] 4− formed at an electrode surface may also contribute to the asymmetric current. The apparent diffusion coefficient of the redox couple increased by over 30% in both cathodic and anodic processes upon applying a magnetic field. For a gold electrode coated with dioctadecyldimethylammonium, the application of a magnetic field perpendicular to the surface increased the peak-to-peak separation, and enhanced the asymmetric current. It is inferred that the application of a magnetic field promotes the electron-tunneling process by tilting chain molecules in the barrier membrane.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic field effects on electric behavior of [Fe(CN)₆]³⁻at bare and membrane-coated electrodes

Saravanan¹,

Fujio²,

Ozeki³

2008

Science and Technology of Advanced Materials

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“…In electrochemistry, magnetic field effects are sometimes observed through the materials flow in fluids [11,12]. Those effects are mainly based on magnetic forces, which can be expressed as interactions between feeble magnetic substances and the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Control of lattice spacing in a triangular lattice of feeble magnetic particles formed by induced magnetic dipole interactions

Hirota

Ando

Tanaka

et al. 2009

Science and Technology of Advanced Materials

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We studied methods of controlling the spacing between particles in the triangular lattice formed by feeble magnetic particles through induced magnetic dipole interaction. Formation of a triangular lattice is described by the balance between the magnetic force and the interaction of induced magnetic dipoles. The intensity of the magnetic force is proportional to the volume of particles V and the difference in the magnetic susceptibilities between the particles and the surrounding medium χ. On the other hand, the intensity of the induced magnetic dipole interaction depends on the square of V and χ . Therefore, altering the magnetic susceptibility difference by changing the susceptibility of the surrounding medium, volume of the particles, and intensity and spatial distribution of the applied magnetic field effectively controls the distance between the particles. In this study, these three methods were evaluated through experiment and molecular dynamics simulations. The distance between the particles, i.e. the lattice constant of the triangular lattice, was varied from 1.7 to 4.0 in units of the particle diameter. Formation of self-organized triangular lattice through the induced magnetic dipole interaction is based on magnetism, a physical property that all materials have. Therefore, this phenomenon is applicable to any materials of any size. Consequently, structure formation through induced magnetic dipole interaction is a potential way of fabricating materials with ordered structures.

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Magnetochemistry and Magnetic Separation

Dunne¹

2021

Handbook of Magnetism and Magnetic Materials

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Application of vertical micro-disk MHD electrode to the analysis of heterogeneous magneto-convection

Cited by 41 publications

References 20 publications

Magnetic field effects on electric behavior of [Fe(CN)₆]³⁻at bare and membrane-coated electrodes

Magnetic field effects on electric behavior of [Fe(CN)₆]³⁻at bare and membrane-coated electrodes

Control of lattice spacing in a triangular lattice of feeble magnetic particles formed by induced magnetic dipole interactions

Magnetochemistry and Magnetic Separation

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Application of vertical micro-disk MHD electrode to the analysis of heterogeneous magneto-convection

Cited by 41 publications

References 20 publications

Magnetic field effects on electric behavior of [Fe(CN)6]3−at bare and membrane-coated electrodes

Magnetic field effects on electric behavior of [Fe(CN)6]3−at bare and membrane-coated electrodes

Control of lattice spacing in a triangular lattice of feeble magnetic particles formed by induced magnetic dipole interactions

Magnetochemistry and Magnetic Separation

Contact Info

Product

Resources

About

Magnetic field effects on electric behavior of [Fe(CN)₆]³⁻at bare and membrane-coated electrodes

Magnetic field effects on electric behavior of [Fe(CN)₆]³⁻at bare and membrane-coated electrodes