Nature continues to serve as inspiration for the design and fabrication of high-performance materials [1,2].The structural and compositional features responsible for e.g. the high hardness and fracture toughness of na...Nature continues to serve as inspiration for the design and fabrication of high-performance materials [1,2].The structural and compositional features responsible for e.g. the high hardness and fracture toughness of nacre,tooth enamel and other biominerals have served as a bench- mark for the structural design of hard and strong materials [3].Wood has been utilized by humankind for millennia for protection,construction,energy and for cultural and religious objects.The hierarchical and cellular structure of wood and the structure-property rela- tions of the constituents and their assemblies:e.g. cellulose,hemicellulose and lignin,has been the focus of intense research efforts and resulted in advances in the fabrication of wood-based functional and structural high- performance materials [4,5].展开更多
Battery safety has attracted considerable attention worldwide due to the rapid development of wearable electronics and the steady increase in the production and use of electric vehicles.As battery failures are often a...Battery safety has attracted considerable attention worldwide due to the rapid development of wearable electronics and the steady increase in the production and use of electric vehicles.As battery failures are often associated with mechanical-thermal coupled behaviors,protective shielding materials with excellent mechanical robustness and flame-retardant properties are highly desired to mitigate thermal runaway.However,most of the thermal insulating materials are not strong enough to protect batteries from mechanical abuse,which is one of the most critical scenarios with catastrophic consequences.Here,inspired by wood,we have developed an effective approach to engineer a hierarchical nanocomposite via self-assembly of calcium silicate hydrate and polyvinyl alcohol polymer chains(referred as CSH wood).The versatile protective material CSH wood demonstrates an unprecedented combination of light weight(0.018 g cm-3),high stiffness(204 MPa in the axial direction),negative Poisson's ratio(-0.15),remarkable toughness(6.67×105 J m-3),superior thermal insulation(0.0204 W m-1 K-1 in the radial direction),and excellent fire retardancy(UL94-V0).When applied as a protective cover or a protective layer within battery packages,the tough CSH wood can resist high-impact load and block heat diffusion to block or delay the spread of fire,therefore significantly reducing the risk of property damage or bodily injuries caused by battery explosions.This work provides new pathways for fabricating advanced thermal insulating materials with large scalability and demonstrates great potential for the protection of electronic devices.展开更多
文摘Nature continues to serve as inspiration for the design and fabrication of high-performance materials [1,2].The structural and compositional features responsible for e.g. the high hardness and fracture toughness of nacre,tooth enamel and other biominerals have served as a bench- mark for the structural design of hard and strong materials [3].Wood has been utilized by humankind for millennia for protection,construction,energy and for cultural and religious objects.The hierarchical and cellular structure of wood and the structure-property rela- tions of the constituents and their assemblies:e.g. cellulose,hemicellulose and lignin,has been the focus of intense research efforts and resulted in advances in the fabrication of wood-based functional and structural high- performance materials [4,5].
基金the financial support from the National Key Research and Development Program of China(No.2021YFF0500802)the National Natural Science Foundation of China(No.51890904,No.52022022,and No.52278247)the Scientific Research and Innovation Plan of Jiangsu Province(KYCX21_0090)。
文摘Battery safety has attracted considerable attention worldwide due to the rapid development of wearable electronics and the steady increase in the production and use of electric vehicles.As battery failures are often associated with mechanical-thermal coupled behaviors,protective shielding materials with excellent mechanical robustness and flame-retardant properties are highly desired to mitigate thermal runaway.However,most of the thermal insulating materials are not strong enough to protect batteries from mechanical abuse,which is one of the most critical scenarios with catastrophic consequences.Here,inspired by wood,we have developed an effective approach to engineer a hierarchical nanocomposite via self-assembly of calcium silicate hydrate and polyvinyl alcohol polymer chains(referred as CSH wood).The versatile protective material CSH wood demonstrates an unprecedented combination of light weight(0.018 g cm-3),high stiffness(204 MPa in the axial direction),negative Poisson's ratio(-0.15),remarkable toughness(6.67×105 J m-3),superior thermal insulation(0.0204 W m-1 K-1 in the radial direction),and excellent fire retardancy(UL94-V0).When applied as a protective cover or a protective layer within battery packages,the tough CSH wood can resist high-impact load and block heat diffusion to block or delay the spread of fire,therefore significantly reducing the risk of property damage or bodily injuries caused by battery explosions.This work provides new pathways for fabricating advanced thermal insulating materials with large scalability and demonstrates great potential for the protection of electronic devices.
