Diffusional homogenization of objects from ultrafine copper and nickel powders

1982 ◽  
Vol 21 (7) ◽  
pp. 554-557 ◽  
Author(s):  
L. N. Paritskaya ◽  
V. I. Novikov ◽  
V. S. Kruzhanov
Keyword(s):  
Nickel Powders ◽  
Diffusional Homogenization ◽  
Ultrafine Copper

scholarly journals ULTRAFINECOPPER AND NICKEL POWDERS INTHE ELECTRO-CATALYTICHYDROGENATIONOF ORGANIC COMPOUNDS

2021 ◽  
Vol 74 (2) ◽  
pp. 32-48
Author(s):  
E.A. SOBOLEVA ◽  
◽  
Ya.A. VISURKHANOVA ◽  
N.M. IVANOVA ◽  
М.Е. BEISENBEKOVA ◽  
...  
Keyword(s):  
Electrocatalytic Activity ◽  
Chemical Reduction ◽  
Ethanol Solution ◽  
Metal Powders ◽  
Nickel Powders ◽  
Polymer Stabilizer ◽  
Skeletal Copper ◽  
Ultrafine Copper ◽  
Copper Cations ◽  
Polymer Stabilizers

Ultrafine copper and nickel powders are synthesized by a chemical reduction of the metal cations from their salts in an aqueous ethanol solution without and with the addition of a polymer stabilizer (polyvinylpyrrolidone and polyvinyl alcohol). The structure and morphological features of the prepared metal powders were investigated by X-ray phase analysis and electron microscopy. The electrocatalytic properties of the Cu and Ni powders have been studied in the electrohydrogenation of acetophenone, nitrobenzene, p-nitroaniline, and cyclohexanone. A higher electrocatalytic activity of Cu powders, as well as skeletal copper, was established in the electrohydrogenation of the first three of the listed compounds in comparison with nickel powders, which is explained by the ability of copper cations to be reduced from its oxides in the electrochemical system under investigation. It is shown that the use of polymer stabilizers in the synthesis of Cu and Ni powders contributes to reducing metal particle sizes, but does not increase the electrocatalytic activity of the corresponding metal powders.

Formation of Graphite Encapsulated Nickel Nanoparticles by Ball Milling and Annealing of Expanded Graphite with Nickel

2011 ◽  
Vol 80-81 ◽  
pp. 217-220 ◽  
Author(s):  
Xue Qing Yue ◽  
Hai Jun Fu ◽  
Da Jun Li
Keyword(s):  
Electron Microscope ◽  
Ball Milling ◽  
Transmission Electron Microscope ◽  
Nickel Nanoparticles ◽  
Size Range ◽  
Expanded Graphite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nickel Powders ◽  
Transmission Electron

Graphite encapsulated nickel nanoparticles were prepared by ball milling andsubsequently annealing a mixture of expanded graphite with nickel powders. The products were characterized by transmission electron microscope and X-ray diffraction. The formation mechanism of the products was discussed. Results show that the products have a size range of 20-150 nm. The graphite and nickel in the products all exhibit a high crystallinity.

The properties of aluminum-nickel powders

1995 ◽  
Vol 33 (5-6) ◽  
pp. 240-243
Author(s):  
L. M. Kurvyakova ◽  
Yu. N. Zhirkova ◽  
A. V. Pomosov
Keyword(s):  
Nickel Powders

Concentration distribution in reduced iron-nickel powders

1970 ◽  
Vol 9 (7) ◽  
pp. 525-527
Author(s):  
L. D. Konchakovskaya ◽  
V. V. Skorokhod
Keyword(s):  
Concentration Distribution ◽  
Nickel Powders ◽  
Iron Nickel
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