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A new method was developed to fabricate ultrafine cobalt nanoparticles with an average diameter of 2.8nm from large precursory cobalt nanoparticles (around 20nm). The obtained ultrafine nanoparticles have a narrow size distribution and a much higher Co/B ratio than that of precursory cobalt nanoparticles (almost 100 times higher). The 2.8nm cobalt nanoparticles were used to catalyze hydroformylation...
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