Biomimetic Nanofabrication by Silkworm‐Inspired Spinning: A Supertough Nano‐Skin Fiber Through Sequenced Interactive Fiber‐Microfluidics

Transforming the fiber‐supported microfluid coating into continuous functional biomimetic nanostructures has attracted widespread attention but faces fundamental challenges due to the persistent Plateau‐Rayleigh instability (PRI). Here, inspired by the interactive anti‐PRI silkworm‐spinning within the natural air‐bath, a sequenced interactive fiber‐microfluidic nanophase separation (SIFMF‐NPS) technology is proposed to address the challenge and enable the continuous production of multifunctional and super‐tough nano‐skin fibers (NSFs). Results show that the SIFMF‐NPS involves interfacial swelling and interdiffusion, nanophase separation, and interfacial co‐crystallization. Consequently, it establishes a remarkably enhanced interfacial strength (119 ± 7.6 MPa, ≈100 times greater than its counterpart), an exceptional toughness of 377 ± 4.6 MJ m−2 (about three times that of its control sample), as well as valuable functions including high‐performance triboelectricity, motion sensitivity, and advanced thermal insulation. This SIFMF‐NPS technology, together with its produced NSF materials, provides a promising manufacturing platform for the scalable production of biomimetic tough‐and‐functional fibers, which may open an avenue for smart textiles/fabrics, wearable electronics, and advanced composite materials.