Fig. 1. Size distribution of MPHs and MPH complexes containing Zn2+ ions and potassium phosphates. MPHs were dispersed in DW at a concentration of 0.5% (w/w). The concentrations of ZnCl2, KH2PO4 and K2HPO4 were 0.09% (w/w), 2% (w/w) and 3% (w/w), respectively.
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