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Physicochemical properties of zinc oxide nanoparticles: (a) Concentration and size distribution of zinc oxide nanoparticles; (b) Zeta potential of zinc oxide nanoparticles; (c) Optical absorption of an aqueous colloidal solution of zinc oxide nanoparticles; (d) TEM image of a group of zinc oxide nanoparticles (image used by the authors earlier in other manuscripts).
