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Characterization of the nanoparticles after dispersion by sonication and coating with PVP40. A, size distribution of copper nanoparticles after sonication, coating with PVP40, and dilution in RPMI 1640 medium containing 10% fetal calf serum. B, SEM image of copper nanoparticles. C, size distribution of copper oxide nanoparticles after sonication, coating with PVP40, and dilution in RPMI 1640 medium containing 10% fetal calf serum. D, SEM image of copper oxide nanoparticles.
