Effect of the surface texture and crystallinity of ZnO nanoparticles on their toxicity

► HRTEM images show crystallinity of nanoparticles B and A (Figs. 4-5). ► Cell viability tests show that large NPs B are more toxic than NPs A of smaller size (Fig. 6 and 7). ► NPs A and B were non-toxic to C1C12 cells (Figs. 8 and 9). ► Implications of the findings: possible synthesis of NPs of engineered toxicity.