Bone,renowned for its elegant hierarchical structure and unique mechanical properties,serves as a constant source of inspiration for the development of synthetic materials.However,achieving accurate replication of bon...Bone,renowned for its elegant hierarchical structure and unique mechanical properties,serves as a constant source of inspiration for the development of synthetic materials.However,achieving accurate replication of bone features in artificial materials with remarkable structural and mechanical similarity remains a significant challenge.In this study,we employed a cascade of continuous fabrication processes,including biomimetic mineralization of collagen,bidirectional freeze-casting,and pressure-driven fusion,to successfully fabricate a macroscopic bulk material known as artificial compact bone(ACB).The ACB material closely replicates the composition,hierarchical structures,and mechanical properties of natural bone.It demonstrates a lamellated alignment of mineralized collagen(MC)microfibrils,similar to those found in natural bone.Moreover,the ACB exhibits a similar high mineral content(70.9%)and density(2.2 g/cm3)as natural cortical bone,leading to exceptional mechanical properties such as high stiffness,hardness,and flexural strength that are comparable to those of natural bone.Importantly,the ACB also demonstrates excellent mechanical properties in wet,outstanding biocompatibility,and osteogenic properties in vivo,rendering it suitable for a broad spectrum of biomedical applications,including orthopedic,stomatological,and craniofacial surgeries.展开更多
基金supported by the National Key R&D Program of China(No.2023YFC2412300 and 2020YFC1107600)the Key R&D Program in Shandong Province(No.2019JZZY011106)the Foshan-Tsinghua Industry-University-Research Cooperation Collaborative Innovation Project.
文摘Bone,renowned for its elegant hierarchical structure and unique mechanical properties,serves as a constant source of inspiration for the development of synthetic materials.However,achieving accurate replication of bone features in artificial materials with remarkable structural and mechanical similarity remains a significant challenge.In this study,we employed a cascade of continuous fabrication processes,including biomimetic mineralization of collagen,bidirectional freeze-casting,and pressure-driven fusion,to successfully fabricate a macroscopic bulk material known as artificial compact bone(ACB).The ACB material closely replicates the composition,hierarchical structures,and mechanical properties of natural bone.It demonstrates a lamellated alignment of mineralized collagen(MC)microfibrils,similar to those found in natural bone.Moreover,the ACB exhibits a similar high mineral content(70.9%)and density(2.2 g/cm3)as natural cortical bone,leading to exceptional mechanical properties such as high stiffness,hardness,and flexural strength that are comparable to those of natural bone.Importantly,the ACB also demonstrates excellent mechanical properties in wet,outstanding biocompatibility,and osteogenic properties in vivo,rendering it suitable for a broad spectrum of biomedical applications,including orthopedic,stomatological,and craniofacial surgeries.
