scholarly journals The effects of a magnetic field on the morphologies of nickel and copper deposits: The concept of "effective overpotential"

2007 ◽  
Vol 72 (8-9) ◽  
pp. 787-797 ◽  
Author(s):  
Nebojsa Nikolic
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Fields ◽  
Applied Magnetic Field ◽  
Electrode Surface ◽  
Copper Deposits ◽  
Perpendicular Orientation ◽  
The Magnetic Field ◽  
Scanning Electron

The morphologies of nickel and copper deposits obtained without applied magnetic fields, and with both parallel and perpendicular applied magnetic fields were examined by the scanning electron microscopy (SEM) technique. Changes in the morphologies of the metals caused by the effect of the magnetic fields are explained by the concept of "effective overpotential". The morphologies of the nickel and copper deposits obtained under parallel oriented magnetic fields were similar to those obtained at some lower cathodic potentials without an applied magnetic field. The magnetic field with a perpendicular orientation to the electrode surface increased the dispersity of the nickel and copper deposits. Nickel and copper deposits obtained under this orientation of the magnetic field were similar to those obtained at some higher cathodic potentials without an applied magnetic field. .

scholarly journals The effect of perpendicularly oriented magnetic field on the formation of very disperse iron structures

2006 ◽  
Vol 71 (10) ◽  
pp. 1083-1089 ◽  
Author(s):  
Nebojsa Nikolic
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Properties ◽  
Applied Magnetic Field ◽  
Iron Deposit ◽  
Iron Deposits ◽  
Branched Structure ◽  
The Magnetic Field ◽  
Scanning Electron

Iron deposits obtained without and with a perpendicularly oriented magnetic field were examined by scanning electron microscopy (SEM). It was found that the iron deposit obtained under a perpendicularly oriented magnetic field had a more highly branched structure than the iron deposit obtained without an applied magnetic field. Comparing the morphologies of these deposits with those of copper deposits, the branching of the iron deposits can essentially be ascribed to the effect of the magnetic field on the magnetic properties of iron. .

Structural and Magnetic Properties of Sintered Materials on the Basis of Zinc Oxide

2013 ◽  
Vol 200 ◽  
pp. 261-266
Author(s):  
Igor Virt ◽  
Igor Rudyi ◽  
Ivan Kurilo ◽  
Ivan Lopatynskyi ◽  
Marian Frugynskyi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Properties ◽  
Theoretical Models ◽  
Structural And Magnetic Properties ◽  
Faraday Method ◽  
The Magnetic Field ◽  
Sintered Materials ◽  
Scanning Electron

Structural and magnetic properties of ceramics Zn1-xCoxO and Zn1-xCrxO are studied. Average sizes of grains are determined by scanning electron microscopy. The magnetic field dependences of magnetic susceptibility are investigated by Faraday method. The relevant theoretical models are chosen.

scholarly journals Some aspects of nickel electrodeposition in the presence of a magnetic field

2005 ◽  
Vol 70 (10) ◽  
pp. 1213-1217 ◽  
Author(s):  
Nebojsa Nikolic
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Properties ◽  
Dendritic Structure ◽  
Nickel Deposit ◽  
Nickel Electrodeposition ◽  
Nickel Deposits ◽  
Scanning Electron

Nickel deposits obtained from a Watt solution both without and with a perpendicularly oriented magnetic field were examined by scanning electron microscopy (SEM). The nickel deposit obtained without an imposed magnetic field was very rough, with a clearly visible clustered structure. The nickel deposit obtained under a perpendicularly oriented magnetic field has a very developed dendritic structure, which can be denoted as arboreous ? bead dendritic structure. The ob- served difference is essentially ascribed to the effect of a magnetic field on the magnetic properties of nickel.

Urethane Magnetorheological Elastomers - Manufacturing, Microstructure and Properties

2009 ◽  
Vol 154 ◽  
pp. 107-112 ◽  
Author(s):  
Anna Boczkowska ◽  
Stefan F. Awietjan
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Vibrating Sample Magnetometer ◽  
Iron Particles ◽  
Magnetorheological Elastomers ◽  
Microstructure And Properties ◽  
Ferromagnetic Particles ◽  
Scanning Electron

In this paper studies on urethane magnetorheological elastomers (MREs) microstructure in respect to their magnetic and mechanical properties are reported. MREs were obtained from a mixture of polyurethane gel and carbonyl-iron particles cured in a magnetic field of 100 and 300 mT. The amount of particles was varied from 1.5 to 33 vol. %. Samples with different arrangements of particles were produced. Effect of the amount of ferromagnetic particles and their arrangement on microstructure and properties in relation to the external magnetic field was investigated. The microstructure was studied using scanning electron microscopy. Magnetic properties were measured using vibrating sample magnetometer. Rheological and mechanical properties under compression were also examined.

Effects of Plate Magnetic Field on Iron-Rich Phase of Al-20Si-10Fe Alloy during Solidification

2012 ◽  
Vol 182-183 ◽  
pp. 167-173
Author(s):  
Ming Li ◽  
Zhi Ming Shi ◽  
Dong Fang
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Phase Transformation ◽  
Optical Microscopy ◽  
Energy Dispersive Spectrum ◽  
Rich Phase ◽  
Transmission Electron ◽  
Scanning Electron

This paper studies iron-rich phase transformation law and mechanism of Al-20Si-10Fe alloy under the effect of plate magnetic field. with optical microscopy(OM)，scanning electron microscopy(SEM),energy dispersive spectrum(EDS)and transmission electron microscopy(TEM). The results show that plate magnetic field is directly involved in the phase transformation of iron-rich phase, making iron-rich phase change from lath-shaped β-Al5FeSi to herringbone-shapedα-Al8SiFe2. The enforcement of plate magnetic field during the phase-transforming process of β-Al5FeSi→α-Al8Si Fe2makes block α-Al1.3Si7.8Fe2.1phase yield out. And precipitation of α-Al1.3Si7.8Fe2.1phase is affected by the transforming process ofβ-Al5SiFe phase→α-Al8Si Fe2phase.

scholarly journals Overpotential controls a morphology of electrolytically produced copper dendritic forms

2019 ◽  
Vol 84 (11) ◽  
pp. 1209-1220
Author(s):  
Nebojsa Nikolic ◽  
Predrag Zivkovic ◽  
Miomir Pavlovic ◽  
Zvezdana Bascarevic
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Crucial Role ◽  
Three Dimensional ◽  
The Other ◽  
Macro Level ◽  
Copper Deposits ◽  
Galvanostatic Regime ◽  
Potentiostatic Regime ◽  
Scanning Electron

The morphologies of copper dendritic forms obtained in both potentiostatic and galvanostatic regimes of electrolysis with various amounts of the electricity were analyzed by the scanning electron microscopy (SEM) technique. Irrespective of amount of passed electricity, 3D (three dimensional) pine-like dendrites with sharp tips were formed in the potentiostatic regime of electrolysis. On the other hand, the amount of passed electricity had a strong effect on the shape of the 3D pine-like dendrites formed in the galvanostatic regime of electrolysis. Dendrites with sharp tips were formed with smaller amount of passed electricity, while dendrites with globular tips were formed with larger amounts. The change in the shape of the galvanostatically synthesized 3D pine-like dendrites was explained by comparison with copper deposits obtained potentiostatically at overpotentials that corresponded to the final overpotentials during galvanostatic regime of electrolysis for the analyzed amounts of electricity. Based on the similarity of the obtained morphologies at the macro level, it was concluded that the overpotential plays a crucial role in the formation of the electrolytically synthesized dendrites and that the controlled conditions of electrolysis could represent a suitable way for a synthesis of spherical Cu particles by electrolysis.

Effects of an Applied Magnetic Field on Directional Solidification of Off-Eutectic Bi-Mn Alloys

1986 ◽  
Vol 87 ◽  
Author(s):  
J. L. Decarlo ◽  
R. G. Pirich
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Directional Solidification ◽  
Applied Magnetic Field ◽  
Transverse Magnetic ◽  
Chemical Analyses ◽  
Directionally Solidified ◽  
Solutal Convection ◽  
The Magnetic Field

AbstractOff-eutectic compositions of Bi-Mn were directionally solidified in applied transverse magnetic fields up to 3 kG to determine the effects odn thermal and solutal convection. For Bi-rich compositions, the magnetic field appeared to increase mixing as determined from thermal, morphological, chemical and magnetic analyses. For Mn-rich compositions morphological and chemical analyses suggest some reduction in mixing due to application of the magnetic field. Conductivity gradients in the melt are suggested as a possible mechanism for the observed results.

scholarly journals Magnetic Field – Assisted Laser Ablation of Titanium Dioxide Nanoparticles in Water for Anti-Bacterial Applications

2021 ◽  
Author(s):  
Hasan H. Bahjat ◽  
R.A. Ismail ◽  
Ghassan M. Sulaiman ◽  
Majid S. Jabir
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Laser Ablation ◽  
Titanium Oxide ◽  
Oxide Nanoparticles ◽  
Titanium Oxide Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy ◽  
The Magnetic Field ◽  
Scanning Electron

Abstract Titanium oxide nanoparticles (TiO2) were produced by pulsed Nd:YAG laser ablation in water under the effect of an external magnetic field. Various techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy Dispersive x-ray (EDX), transmission electron microscopy (TEM), UV-Vis spectroscopy, and Raman spectroscopy were used to characterize the TiO2 nanoparticles. The XRD analysis of titanium oxide nanoparticles revealed that the synthesized nanoparticles were polycrystalline with mixed of tetragonal anatase and rutile TiO2. Scanning electron microscope shows the formation of spherical nanoparticles and the particles agglomeration decreases and the particle size from increases from 25nm to 35nm when the magnetic field applied. The optical energy gap of TiO2 nanoparticles decreased from 4.6eV to 3.4eV after using the magnetic field during the ablation. Raman studies show the existence of five vibration modes belong to TiO2. The antibacterial effect assay revealed a largest inhibition zone in S. aureus and E. coli, with a more potent effect for TiO2 NPs prepared by magnetic field when compared with that prepared without presence of magnetic field.

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