Morphology of magneto-electrodeposited Cu2O microcrystals

Abstract

Morphological development during electrocrystallization of cuprous oxide crystals has been reported. Studies have been focused on the effects of magnetohydrodynamic convection generated by superimposition of a high magnetic field up to 12 T. Variation of the crystal morphology from dense to labyrinthine and finally very highly porous structure with magnetic field has been obtained, whereas no change in the crystallization growth envelope was shown. Here crystals grown under microconvection induced by magnetic field are different because of changes in the diffusion process. These results have shown that magnetic field acts principally on the branching growth but does not modify the crystal habit.

Process intensification: An electrochemical perspective

“…A magnetic field has been found to modify the morphology of individual crystals via micro-MHD convection are [61,62] and the morphology of electrodeposited materials [63,64]. In addition to having an influence on growth, a magnetic field will influence nucleation of gas from solution and metals,…”

Magnetic field driven assembly of 1D-aligned silver superstructures

“…10,11 Daltin and co-workers have synthesized cuprous oxide hierarchical superstructures by a magneto-electrodeposited method. 12,13 Based on the excellent literature examples, it can be proposed that the appropriate employment of external physical fields would artificially synthesize the Ag superstructures with many building blocks. To date, the relevant experimental investigation is still unavailable.…”

“…A magnetic field imposed during electrodeposition could change the growth habit, which has been demonstrated by the previous reports. 12,13 When a magnetic field is applied onto the electrochemical cell, some forces can be created along the electrode. As the magnetic field is parallel to the electrode, the Lorentz force and the Coulombian force can be involved, which generates convection tangentially to the electrode and leads to a decrease of the diffusion layer thickness.…”

“…As the magnetic field is parallel to the electrode, the Lorentz force and the Coulombian force can be involved, which generates convection tangentially to the electrode and leads to a decrease of the diffusion layer thickness. 13 However, when the magnetic field lines are perpendicular to the electrode, a paramagnetic force could be generated, which would induce a complex microscopic convection effect inside the diffusion layer, modify the mass diffusion flux, and finally affect the growth habit of the products. This effect is possible not only in ferromagnetic materials but also in nonmagnetic ones such as paramagnetic materials.…”

Electrochemical Fabrication of Copper-Based Hybrid Microstructures and Mechanism of Formation of Related Hierarchical Structures on Polypyrrole Films

“…Parameters that have been investigated which alter the shape of the Cu 2 O crystal formed include surfactant molecule additives, 21 potential/current applied, 22 pH, 23 and the application of a magnetic field. 24,25 In this paper we show that by altering the electrode potential one can control the shape of Cu 2 O microcrystals deposited on a conducting polymer. Moreover, we have prepared hybrid microstructures by…”