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Different images showing the structure of halloysite nanotubes (HNTs). Transmission electron microscopy (TEM) images of halloysite nanotubes at different magnifications (a) 30,000×, (b) 80,000×. Field emission scanning electron microscopy (FESEM) images of (c) HNT aggregate at 10,000× and (b) isolated HNTs showing dimensions and the tubular structure at 100,000×.
