Flexible High-Aspect-Ratio COF Nanofibers: Defect-Engineered Synthesis, Superelastic Aerogels, and Uranium Extraction Applications

Covalent organic framework nanofibers (CNFs) with biomimetic scale-like architecture, record-high aspect ratio ( L / D  = 103.05), and superior flexibility were directly synthesized via defect engineering. Self-standing membranes and nanofibrous aerogels (CNF-As) with designable micro-topological structures were fabricated with 100% CNFs. CNF-As perform photo-induced uranium extraction with an adsorption capacity and adsorption rate of 920.12 mg g −1 and 89.9%, respectively. CNF-As exhibit superior underwater stability (> 180 days) and superelasticity (~ 0% deformation after 500 compression cycles), making them promising for practical application in marine systems.