Xu Zhao,Derui Kong,Jinlong Tao,Na Kong,Pablo Mota-Santiago,Peter A. Lynch,Yanqiu Shao,Jizhen Zhang
Carbon nanotubes (CNTs) are promising blocks for building advanced yarns with unique structural and functional attributes. However, the complexity of fabrication and high cost has hindered the widespread adoption of CNT yarns. In this study, a rapid and continuous twisting wet spun yarn strategy to produce highly densified CNT yarns is presented. The method involves effectively dispersing CNTs in the surfactant dispersion, swiftly removing the surfactant in the coagulation bath and twisting treatment to effectively improve the density of yarn and the orientation of CNT. Detailed characterizations on the influence of each spinning conditions reveal that twisting treatment significantly enhances the packing density of yarns, improves the orientation of CNTs, and mitigates the impact of impurities on conductivity. The resulting CNT yarns exhibit a remarkable tensile strength of 600 MPa, a Young's modulus of ≈40 GPa, and a high conductivity of 8990 S cm −1 . When utilized as a yarn heater, the CNT yarn demonstrates an ultra-fast electrothermal response of over 1000 °C s −1 at a low operating voltage of 5 V. Impressively, the mechanical properties of CNT yarns show good stability during heating. This study provides a perspective of structural engineering for the large-scale preparation of high-performance CNT yarns.
Aerogels have been considered as super thermal insulators. However, they often exhibit less satisfactory mechanical properties for textile application due to their fragility and poor processability. These problems are overcome through a twisting-induced fibrillation method, using 2D nanofiber membranes as mediators, to process aerogel particles into continuous macroscopic yarns based on a roll-to-roll format. A low concentration of strong nanofiber host in twisted form provides structural support to the aerogel particles and preserves their porous architecture. Despite the high-volume ratio (≈78%) of aerogel particles, the aerogel yarns show high strength, ideal flexibility, and impressive thermal insulation properties. Textiles woven with the aerogel yarns are warmer than cashmere. The aerogel textile is extremely stable under temperatures of −196 and 100 °C, mechanical deformation, and even washing. This technology provides a flexible platform to extend the function (e.g., dyeability, hydrophobicity, and Joule heating) of aerogel yarns and textiles to suit various use scenarios.
危险品化学品经营许可证（带存储）