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HR-SEM images of cryo-fractured cross-sections of (a–c) a 65-layer (low-density polyethylene (LDPE)/carvacrol)/ethylene vinyl alcohol copolymer (EVOH) film; and (d–f) a 65-layer (LDPE/[halloysite nanotubes (HNTs)/carvacrol])/EVOH film, at a low magnification demonstrating the entire film thickness, medium and higher magnifications. HNTs appear to be finely dispersed in the LDPE layer, marked by arrows for clarity. Note that the films were cross-sectioned in the transverse direction.
