Pan Xiao-Feng, Gao Huai-Ling, Wu Kai-Jin, Chen Si-Ming, He Tao, Lu Yang, Ni Yong, Yu Shu-Hong
Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Institute of Energy, Hefei Comprehensive National Science Center, CAS Center for Excellence in Nanoscience, Department of Chemistry, Institute of Biomimetic Materials & Chemistry, University of Science and Technology of China, Hefei 230026, China.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China.
iScience. 2020 Dec 26;24(1):101971. doi: 10.1016/j.isci.2020.101971. eCollection 2021 Jan 22.
Low density, high strength and toughness, together with good environmental stability are always desirable but hardly to achieve simultaneously for man-made structural materials. Replicating the design motifs of natural nacre clearly provides one promising route to obtain such kind of materials, but fundamental challenges remain. Herein, by choosing aramid nanofibers and mica microplatelets as building blocks, we produce a nacreous aramid-mica bulk material with a favorable combination of low density (∼1.7 g cm), high strength (∼387 MPa) and toughness (∼14.3 MPa m), and impressive mechanical stability in some harsh environments, including acid/alkali solutions, strong ultraviolet radiation, boiling water, and liquid nitrogen, standing out from previously reported biomimetic bulk composites. Moreover, the obtained material outperforms other bulk nacre-mimetics and most engineering structural materials in terms of its specific strength (227 MPa/[Mg m]) and specific toughness (8.4 MPa m/[Mg m]), making it a new promising engineering structural material for different technical fields.
低密度、高强度和高韧性，以及良好的环境稳定性，一直是人造结构材料所期望具备的特性，但却很难同时实现。复制天然珍珠层的设计图案显然为获得此类材料提供了一条有前景的途径，但仍存在一些根本性挑战。在此，通过选择芳纶纳米纤维和云母微片作为构建单元，我们制备了一种珍珠层状芳纶 - 云母块状材料，其具有低密度（约1.7 g/cm³）、高强度（约387 MPa）和韧性（约14.3 MPa·m¹/²）的良好组合，并且在一些恶劣环境中，包括酸/碱溶液、强紫外线辐射、沸水和液氮中，展现出令人印象深刻的机械稳定性，这使其从先前报道的仿生块状复合材料中脱颖而出。此外，所获得的材料在比强度（227 MPa/[Mg/m³]）和比韧性（8.4 MPa·m¹/²/[Mg/m³]）方面优于其他块状仿珍珠层材料和大多数工程结构材料，使其成为适用于不同技术领域的一种新型且有前景的工程结构材料。
