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Four kinds of polyvinyl pyrrolidone (PVP) with various molecular weights (Mw: 111, 8000, 40000, and 630000) were investigated in this work for their ability to disperse sub-micron nickel particles synthesized by chemical reduction of NiCl2 with hydrazine hydrate. Our results indicate that dispersion of the resultant nickel particles was significantly dependent on the molecular weights of PVP, and...