Lee Won Jun, Paineau Erwan, Anthony David Benbow, Gao Yulin, Leese Hannah Siobhan, Rouzière Stéphan, Launois Pascale, Shaffer Milo Sebastian Peter
Department of Materials, Department of Chemistry, South Kensington Campus, Imperial College London, London, U.K. SW7 2AZ.
Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris Sud, Université Paris Saclay, Bâtiment 510, Orsay, Île-de-France FR 91405, France.
ACS Nano. 2020 May 26;14(5):5570-5580. doi: 10.1021/acsnano.9b09873. Epub 2020 Apr 21.
The assembly of one-dimensional nanomaterials into macroscopic fibers can improve mechanical as well as multifunctional performance. Double-walled aluminogermanate imogolite nanotubes are geo-inspired analogues of carbon nanotubes, synthesized at low temperature, with complementary properties. Here, continuous imogolite-based fibers are wet-spun within a poly(vinyl alcohol) matrix. The lyotropic liquid crystallinity of the system produces highly aligned fibers with tensile stiffness and strength up to 24.1 GPa (14.1 N tex) and 0.8 GPa (0.46 N tex), respectively. Significant enhancements over the pure polymer control are quantitatively attributed to both matrix refinement and direct nanoscale reinforcement, by fitting an analytical model. Most intriguingly, imogolite-based fibers show a high degree of healability evaporation-induced self-assembly, recovering up to 44% and 19% of the original fiber tensile stiffness and strength, respectively. This recovery at high absolute strength highlights a general strategy for the development of high-performance healable fibers relevant to composite structures and other applications.
将一维纳米材料组装成宏观纤维可以改善机械性能以及多功能性能。双壁铝锗酸盐埃洛石纳米管是受地质启发的碳纳米管类似物，在低温下合成，具有互补性能。在此，连续的基于埃洛石的纤维在聚乙烯醇基质中进行湿法纺丝。该体系的溶致液晶性产生了高度取向的纤维，其拉伸刚度和强度分别高达24.1 GPa（14.1 N/tex）和0.8 GPa（0.46 N/tex）。通过拟合一个分析模型，相对于纯聚合物对照物的显著增强在数量上归因于基质细化和直接的纳米级增强。最引人注目的是，基于埃洛石的纤维表现出高度的可愈合性——通过蒸发诱导自组装，分别恢复了高达44%和19%的原始纤维拉伸刚度和强度。在高绝对强度下的这种恢复突出了一种用于开发与复合结构及其他应用相关的高性能可愈合纤维的通用策略。
