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Different types of electrospun NYs. Schematic and SEM images of electrospun NYs with highly aligned fibrous structures (A, B) and with high twisting (C, D) and electrospun nanofiber-coated microfiber coverspun yarns with core-sheath structures (E, F). The blue dashed line indicates the inner microfibers of the coverspun yarns. (B) Reprinted with permission from Ref. [62].
