Chen Si-Ming, Wang Guang-Zhen, Hou YuanZhen, Yang Xiao-Nian, Zhang Si-Chao, Zhu ZiBo, Li JiaHao, Gao Huai-Ling, Zhu Yin-Bo, Wu HengAn, Yu Shu-Hong
Department of Chemistry, New Cornerstone Science Laboratory, Institute of Biomimetic Materials & Chemistry, Anhui Engineering Laboratory of Biomimetic Materials, Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, 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 230027, China.
Sci Adv. 2024 Apr 5;10(14):eadl1884. doi: 10.1126/sciadv.adl1884.
Introducing natural Bouligand structure into synthetics is expected to develop high-performance structural materials. Interfibrous interface is critical to load transfer, and mechanical functionality of bioinspired Bouligand structure yet receives little attention. Here, we propose one kind of hierarchical and reconfigurable interfibrous interface based on moderate orderliness to mechanically reinforce bioinspired Bouligand structure. The interface imparted by moderate alignment of adaptable networked nanofibers hierarchically includes nanofiber interlocking and hydrogen-bonding (HB) network bridging, being expected to facilitate load transfer and structural stability through dynamic adjustment in terms of nanofiber sliding and HB breaking-reforming. As one demonstration, the hierarchical and reconfigurable interfibrous interface is constructed based on moderate alignment of networked bacterial cellulose nanofibers. We show that the resultant bioinspired Bouligand structural material exhibits unusual strengthening and toughening mechanisms dominated by interface-microstructure multiscale coupling. The proposed interfibrous interface enabled by moderate orderliness would provide mechanical insight into the assembly of widely existing networked nanofiber building blocks toward high-performance macroscopic bioinspired structural assemblies.
将天然布利冈结构引入合成材料有望开发出高性能结构材料。纤维间界面对于载荷传递至关重要，而仿生布利冈结构的力学功能尚未得到足够关注。在此，我们基于适度有序性提出了一种分层且可重构的纤维间界面，以机械增强仿生布利冈结构。由适应性网络化纳米纤维适度排列赋予的界面分层包括纳米纤维互锁和氢键（HB）网络桥接，有望通过纳米纤维滑动和HB断裂-重构的动态调整促进载荷传递和结构稳定性。作为一个示例，基于网络化细菌纤维素纳米纤维的适度排列构建了分层且可重构的纤维间界面。我们表明，所得的仿生布利冈结构材料展现出由界面-微观结构多尺度耦合主导的异常强化和增韧机制。由适度有序性实现的所提出的纤维间界面将为广泛存在的网络化纳米纤维构建块组装成高性能宏观仿生结构组件提供力学见解。
