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Polyethylenimine (PEI)-protected Prussian blue nanocubes have been simply synthesized by heating an acidic mixture of PEI, FeCl 3, K 3Fe(CN) 6, and KCl. The experiment results presented here demonstrate that the pH of the mixture plays an important role in controlling the shape and composition of the resultant product.
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Zhai et al. (2008) studied this question.
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