Precipitation of Nickel Hydroxides from Nickel Dodecylsulphate
Classical precipitation techniques applied to a nickel di-dodecylsulphate Ni(DS)2 precursor were developed. In the range of concentrations studied this precursor forms direct micelles in water. In pH-controlled double jet precipitation with soda at 60°C, the pure a, poorly crystallised bbc and well crystallised b phases are successively obtained by pH shifts from 8 to 11, whereas the platelet morphology remains similar. In the same conditions, classical salts never lead to a phase and the particle size and morphology is pH dependent. Hydroxide precipitation by ammonia decomplexation, via heating at 60°C, Ni(DS)2 leads to well-calibrated stacks of b- Ni(OH)2 nanopancakes (300 nm in diameter and 200 nm stacking length) whereas classical salts lead to micrometric particles characterised by thin interconnected walls.
Radu Robert Piticescu, Witold Lojkowski and John R. Blizzard
C. Coudun and J.-F. Hochepied, "Precipitation of Nickel Hydroxides from Nickel Dodecylsulphate", Solid State Phenomena, Vol. 106, pp. 35-40, 2005