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The branched polyethyleneoxide-polyethyleneimine (PEO)n-b-PEI block copolymers are synthesized and fractionated. The (PEO)n-b-PEI block copolymers are found to be able to form micelles in aqueous solution after addition of certain metal compounds (H2PtCl6, Na2PtCl4, RhCl3). The degree of copolymer polydispersity seems to play an important role in metal nanoparticle stabilization. Comparison of diblock...