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Characterization of compound-loaded ZnO NPs. Zeta potential measurement for (A) drug-free ZnO NPs and (B) ZnO NPs loaded with compound M3. NPs samples were diluted with distilled water and zeta potential were determined using Laser Doppler Velocimetry (LDV) mode. (C) SEM micrographs of ZnO NPs loaded with M3. ZnO NPs samples were placed on carbon tape after dryness then coated with gold prior to measurement.
