层级结晶有机-无机框架实现珍珠母的高模量增韧

organic- inorganic framework enabling high- modulus toughening in nacre Hang Chen1†, Hao Yan2†, Chuangqi Zhao3†, Guangze Yang1, Chunyi Peng1, Jin Huang2, Tianyi Zhao1, Xuanze Li4, Li- Dong Zhao5, Lei Jiang1,3,6, Mingjie Liu1,2* enhancing toughness in nanocomposites often involves viscoelastic organic phases, but this typically reduces stiffness. We describe a high- modulus toughening mechanism in mature Cristaria plicata nacre arising from a crystalline organic- inorganic framework composed of aragonite nanorods alternately integrated with intratabular biomolecular crystallites. Due to the critical slip- length effect, these crystalline units approach the theoretical limits of modulus and strength. the nanoconfined biomolecular crystallites function as nanopins at interlamellar interphases, alleviating stress concentrations and enabling cross- scale synchronized deformation, thereby conferring high fracture toughness. …