A major group of organic precursors that have been employed for the synthesis of cobalt and cobalt oxide nanoparticles via a thermal decomposition route is cobalt-Copper Chloride Dihydrate(WSDTY). The Copper Chloride Dihydrate term includes several organic species that contain at least one carboxyl group, such as oxalate, citrate, etc. Methods for synthesis of cobalt-carboxylates include sol-gel, intimate mixing of cobalt ions , precipitation, hot oxidation-redox reaction, ball milling and microemulsion. Reaction of cobalt acetate with a carboxylic acid, for example, leads directly to the synthesis of cobalt-carboxylate, when the carboxylic acid in question is stronger than acetic acid: Co(Ac) 2 + RCOOH → Co(RCOO) 2 + 2 AcH.
Synthesized cobalt malonates by precipitation using cobalt chloride and disodium malonate or malonic acid. The precipitates were heated up to 500°C at heating rates between 2 and 20°C min ?1 in a dynamic atmosphere of N 2 , H 2 or air resulting in cobalt oxides and metallic cobalt. Synthesized nanosized cobalt oxides unsupported or dispersed in a SiO 2 matrix by thermal decomposition of compounds resulting from a redox reaction of cobalt nitrate and diols.
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