Guo Pengfei, Su Lei, Peng Kang, Lu De, Xu Liang, Li Mingzhu, Wang Hongjie
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
ACS Nano. 2022 Apr 26;16(4):6625-6633. doi: 10.1021/acsnano.2c01039. Epub 2022 Apr 11.
Resilient ceramic aerogels are emerging as a fascinating material that features light weight, low thermal conductivity, and recoverable compressibility, promising widespread prospects in the fields of heat insulation, catalysis, filtration, and aerospace exploration. However, the construction of the resilient ceramic aerogels with rational designed multiscale architectures aiming for tunable physical and mechanical performances remains a major challenge. Here, 3D constructed resilient SiC nanowire aerogels possessing programmed geometries and engineered mechanical properties are created additive manufacturing. The Young's modulus of the fabricated SiC nanowire aerogel lattices are tuned systematically from 0.012 MPa to 5.800 MPa spanning over 2 orders of magnitude. More importantly, the customized lightweight and resilient SiC nanowire aerogels show a low thermal conductivity (0.046 W m K). The present work provides another approach to the design and rapid fabrication of resilient ceramic aerogels toward flexible thermal management devices, lightweight engineered structures, and other potential applications.
弹性陶瓷气凝胶正成为一种引人入胜的材料，具有重量轻、热导率低和可恢复压缩性等特点，在隔热、催化、过滤和航空航天探索等领域有着广阔的前景。然而，构建具有合理设计的多尺度结构以实现可调物理和机械性能的弹性陶瓷气凝胶仍然是一项重大挑战。在此，通过增材制造创建了具有可编程几何形状和工程化机械性能的三维构建弹性碳化硅纳米线气凝胶。所制备的碳化硅纳米线气凝胶晶格的杨氏模量在0.012兆帕至5.800兆帕之间系统地调整，跨越了2个数量级。更重要的是，定制的轻质弹性碳化硅纳米线气凝胶显示出低导热率（0.046瓦每米开尔文）。目前的工作为设计和快速制造用于柔性热管理装置、轻质工程结构及其他潜在应用的弹性陶瓷气凝胶提供了另一种方法。
