Autoclave Synthesis of Finely Divided Nickel Powders
| Autor: | N. V. Belousova, Galina M. Zeer, R. V. Borisov, O. V. Belousov, A. S. Romanchenko |
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| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Materials science Scanning electron microscope Materials Science (miscellaneous) Hydrazine chemistry.chemical_element Autoclave Inorganic Chemistry chemistry.chemical_compound Nickel chemistry Specific surface area otorhinolaryngologic diseases Hydroxide Particle Physical and Theoretical Chemistry Hydrate Nuclear chemistry |
| Zdroj: | Russian Journal of Inorganic Chemistry. 66:1463-1468 |
| ISSN: | 1531-8613 0036-0236 |
| DOI: | 10.1134/s003602362110003x |
| Popis: | The reduction of divalent nickel with hydrazine hydrate from alkaline ammonia solutions at elevated temperatures was studied. A procedure to synthesize finely divided nickel powders was proposed. The morphology of the objects obtained under various synthesis conditions was investigated by scanning electron microscopy; it was shown that both needle-like and spherical particles can form. The specific surface area of the synthesized metallic nickel powders was determined by low-temperature nitrogen adsorption to be within the range 5–20 m2/g, depending on the synthesis conditions (the concentration of the initial salt in the solution, the pH, and the temperature). X-ray powder diffraction analysis showed that all the powders are mixtures of two phases: nickel (to 99%) and nickel hydroxide. X-ray photoelectron spectroscopy demonstrated that a particle of the powders consists of a nickel(0) core coated with several atomic layers of nickel hydroxide. |
| Databáze: | OpenAIRE |
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