Izvorni znanstveni članak
Preparation of nickel powders in nonaqueous media
Jadran Macek
; University of Ljubljana, Faculty of Chemistry and Chem. Technology, Aškerčeva 5, P.O.B. 537, 61000 Ljublana, Slovenia
Andrej Degen
; University of Ljubljana, Faculty of Chemistry and Chem. Technology, Aškerčeva 5, P.O.B. 537, 61000 Ljublana, Slovenia
Sažetak
Precipitation of nickel powder is usually carried out in aqueous media. Nonaqueous solvents such as ethanolamines offer several advantages. The effective temperature range extends to the higher temperatures needed for the reduction of nickel at atmospheric pressure, a reaction that is also facilitated by the basicity of the medium. Tests were carried out for the preparation of submicrometre nickel powders by the reduction of metal salts using various ethanolamines (monoethanolamine - MEA, diethanolamine - DEA, and triethanolamine - TEA) as solvents. Hydrazine (N2H4) was used as the reducing agent. The basicity, polarity, viscosity and boiling point of the reaction medium all affect the reactions. By changing the reaction conditions and the anionic component of the precursor salt, it was possible to alter the purity and morphology of the nickel powders obtained and the average particle size, except in the case of MEA where no reduction occured. The products were subsequently characterised by chemical analysis and by scanning electron microscopy.
Ključne riječi
Hrčak ID:
299484
URI
Datum izdavanja:
2.5.1995.
Posjeta: 589 *