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Preparation and Characterization of Uniform Needle-like Particles of Nickel Basic Sulfate

✍ Scribed by Manuel Ocaña

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
127 KB
Volume
228
Category
Article
ISSN
0021-9797

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✦ Synopsis

Needle-like particles (maximum length, ∼2 µm) of nickel basic sulfate (Ni(OH) 1.4 (SO 4 ) 0.3 ) were prepared by forced hydrolysis at 100 • C for 2 days of aqueous solutions containing nickel(II) nitrate, nickel(II) sulfate, and sodium acetate in the appropriated concentrations. The needles were characterized in terms of their composition, crystal structure, and electrokinetic behavior. Their structural and compositional evolutions with temperature were also studied. It was found that a dehydroxylation process took place on heating at 500 • C after which the particles consisted of a mixture of crystalline NiO and an amorphous nickel sulfate. This compound decomposed at a higher temperature (800 • C) yielding NiO. The particles lost the needle-like shape after calcination at 500 • C.

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