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(a, b) Size estimation of nanoparticles using TEM images, for (a) material generated in a VFD with the glass tube at a 45° tilt angle and rotating at 7.5 k rpm, flow rate of water 0.25 mL/min, and the 1064 nm-pulsed laser operating at 600 mJ and irradiating a copper target, and (b) CuONPs prepared from a Cu2ONPs dispersion in water after heating at 50 °C for 10 h in an oven.
