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SEM images of a pristine PU b Olive oil (10 wt.%)/PU blend system c Olive oil (5 wt.%)/ZnO-PU d TEM image of Olive oil (5 wt.%)/ZnO-PU hybrid nanofibers. The yellow arrows depict the Olive oil encapsulation region. The yellow arrows depict the point bonding region and the green arrows show the defective regions in nanofibers; whereas the red arrows show the ZnO nanoparticles
