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High-resolution scanning electron microscope (HR-SEM) images of cryo-fractured cross-sections of (a) neat PP and (b) PP/(HNTs-carvacrol) films. Several HNTs are marked with arrows for clarity. The HNTs are finely dispersed within the PP matrix. The inset shows a high-magnification micrograph, depicting HNTs protruding from the PP matrix. The HNTs exhibit a characteristic morphology of cylindrical tubes, with an external diameter of up to 100 nm.
