biostudies-literatureCho YSKorea Evaluation Institute of Industrial TechnologyNational Research Council of Science and TechnologyKorea Institute of Science and Technologye2400460https://www.ebi.ac.uk/biostudies/studies/S-EPMC11220680biostudies-literatureUnknown11(25)Lightweight structural materials are commonly used as effective fillers for advanced composites with high toughness. This study focused on enhancing the toughness of direct-spun carbon nanotube yarns (CNTYs) by controlling the micro-textural structure using a water-gap-based direct spinning. Drawing inspiration from the structural features of natural spider silk fibroin, characterized by an α-helix in the amorphous region and β-sheet in the crystalline region, multiscale bundles within CNTYs are reorganized into a unique nano-coil-like structure. This nano-coiled structure facilitated the efficient dissipation of external mechanical loads through densification with the rearrangement of multiscale bundles, improving specific strength and strain. The resulting CNTYs exhibited exceptional mecAdvanced science (Weinheim, Baden-Wurttemberg, Germany)Super-Toughness Carbon Nanotube Yarns by Bio-Inspired Nano-Coiling Engineering.PMC1122068020010853CRC22031‐000CRC22031-000NRF‐2021R1A4A200140320017548NRF-2021R1A4A2001403Cho YSPark JYPark CRJung YYang SJKim SMLee JWPark JSfalseSuper-Toughness Carbon Nanotube Yarns by Bio-Inspired Nano-Coiling Engineering.Lightweight structural materials are commonly used as effective fillers for advanced composites with high toughness. This study focused on enhancing the toughness of direct-spun carbon nanotube yarns (CNTYs) by controlling the micro-textural structure using a water-gap-based direct spinning. Drawing inspiration from the structural features of natural spider silk fibroin, characterized by an α-helix in the amorphous region and β-sheet in the crystalline region, multiscale bundles within CNTYs are reorganized into a unique nano-coil-like structure. This nano-coiled structure facilitated the efficient dissipation of external mechanical loads through densification with the rearrangement of multiscale bundles, improving specific strength and strain. The resulting CNTYs exhibited exceptional mec2024-01-01T00:00:00Z2024 Jul2025-04-04T12:53:59.096Z2025-04-04T12:53:59.096ZS-EPMC112206803865462210.1002/advs.202400460