Microbubble Formation from Ionic Vacancies in Copper Electrodeposition under a High Magnetic Field

Miura, Makoto; Aogaki, Ryoichi; Oshikiri, Yoshinobu; Sugiyama, Atsushi; Morimoto, Ryoichi; Miura, Masashi; Mogi, Iwao; Yamauchi, Yusuke

doi:10.5796/electrochemistry.82.654

Cited by 18 publications

(21 citation statements)

References 8 publications

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“…In copper deposition, the same kind of microbubble evolution has been also observed, 12 where the measurement of the partial molar volume of ionic vacancy revealed that ionic vacancies are stoichiometrically created with electrode reactions. These experimental results suggest that evolution of ionic vacancy is a universal phenomenon in electrode reactions, and that ionic vacancies emerge with the conservation of momentum as well as electric charge; if ionic vacancy is created in anodic copper dissolution, as shown in Eqs.…”

mentioning

confidence: 75%

“…The validity of these electrodes has been proved by the preceding experiments. 11,12 Then, the microbubbles are in situ observed by optical microscope. To ensure the process mentioned above, the origin of the gas contained in the microbubbles is examined by the following blank Electrochemistry, 83 (7), 549-553 (2015) test; prior to experiment, all the gases including dissolved gases are removed from the electrode cell with vacuum pump, which makes nanobubble formation impossible and will prepare the electrode surface without microbubble evolution.…”

Section: Theoreticalmentioning

confidence: 99%

“…In this paper, the sheath-type one is used, of which validity have been already proved in the foregoing paper. 12 …”

Section: Theoreticalmentioning

confidence: 99%

“…4,5 Recently, it has been found that in electrode reactions, absolutely different type of cavity, i.e., ionic vacancies are created. 7,8,11,12 An ionic vacancy is composed of water molecules and ions, which yield a charged vacuum space of about a 1 ¡ radius surrounded by an oppositely charged ionic cloud (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Microbubble Formation from Ionic Vacancies in Copper Anodic Dissolution under a High Magnetic Field

et al. 2015

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Ionic vacancies created in copper anodic dissolution has been firstly observed by the conversion to microbubbles using both of cyclotron effect and pinch effect under a vertical magnetic field; in a circulating solution induced by Lorentz force, ionic vacancies collide with each other, changing to nanobubbles. Then, the circulation of the nanobubbles with solution makes further collisions, yielding microbubbles. Based on this result, the lifetimes of ionic vacancy formed in copper electrodeposition were finally determined.

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mentioning

confidence: 75%

Section: Theoreticalmentioning

confidence: 99%

“…In this paper, the sheath-type one is used, of which validity have been already proved in the foregoing paper. 12 …”

Section: Theoreticalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microbubble Formation from Ionic Vacancies in Copper Anodic Dissolution under a High Magnetic Field

et al. 2015

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“…The existence of such vacancies was confirmed by the observation of micro-bubbles arising from the aggregation of ionic vacancies. 31 In the vicinity of electrodes, the ionic vacancies extremely decrease the viscosity and the friction, 20 leading to the excitation of nanometer-scale MHD vortices. Consequently, the most probable chiral site on the MED film surfaces is a screw dislocation.…”

Section: ¹2mentioning

confidence: 99%

Tailoring of Surface Chirality by Micro-Vortices and Specific Adsorption in Magnetoelectrodeposition

Mogi

Aogaki

Watanabe

2015

Bulletin of the Chemical Society of Japan

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Solid surfaces often serve as a reaction field for organic molecules. If a surface has chirality, it could play a significant role as an enantioselective catalyst. Electrodeposition in magnetic fields (magnetoelectrodeposition; MED) has potential to produce enantioselective metal surfaces, however, the exploration of chiral formation conditions has not been sufficient in previous MED experiments. Here we show the chiral behaviors of copper film surfaces prepared by galvanostatic MED. We found that the chiral sign depends on both the deposition current and the polarity of magnetic field. Furthermore, we found that the specific adsorption of chloride ions on the film surfaces brings about drastic influence on the chiral formation in MED. At certain chloride concentrations chiral symmetry breaking was observed for the polarity of magnetic field. These findings imply that magnetohydrodynamic micro-vortices and the rate-limiting steps are responsible for the chiral surface formation.

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Progress toward Electrochemistry Intensified by using Supergravity Fields

Wang

Gong

et al. 2015

ChemElectroChem

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Supergravity fields with high gravity acceleration can promote interphase ship velocity and convection velocity. Over the past decade, research has been devoted to enhancing electrochemical reactions by using supergravity fields. The enhancement of electrochemical reactions is ascribed to the acceleration of mass transfer and bubble separation. In this Minireview, the intensification kinetics of a supergravity field on mass transfer and bubble separation during electrochemical reactions are analyzed theoretically. The progress in terms the enhancement of electrochemical reactions (such as metal electrodeposition, water electrolysis, and chloralkali electrolysis) under a supergravity field is reviewed. The structures and properties of functional films electrodeposited under a supergravity field on both the cathode and the anode are summarized. The Minireview is helpful to understand the effect of the mechanism of the supergravity field on electrochemical reactions and to expand potential applications.

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Microbubble Formation from Ionic Vacancies in Copper Electrodeposition under a High Magnetic Field

Cited by 18 publications

References 8 publications

Microbubble Formation from Ionic Vacancies in Copper Anodic Dissolution under a High Magnetic Field

Microbubble Formation from Ionic Vacancies in Copper Anodic Dissolution under a High Magnetic Field

Tailoring of Surface Chirality by Micro-Vortices and Specific Adsorption in Magnetoelectrodeposition

Progress toward Electrochemistry Intensified by using Supergravity Fields

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