气凝胶
材料科学
纳米纤维
碳纳米管
纤维素
多孔性
碳纳米纤维
复合材料
各向异性
热导率
纵横比(航空)
保温
模数
化学工程
工程类
图层(电子)
物理
量子力学
作者
Mengxia Wang,Xiaran Miao,Chen Hou,Ke Xu,Zhao Ke,Fengna Dai,Mingyuan Liu,Hui Li,Chunhai Chen
标识
DOI:10.1016/j.carbpol.2023.121437
摘要
The anisotropic cellulose nanofiber (CNF)/carbon nanotube (CNT) aerogels hold a great promise in directional applications due to their distinct xylem-like aligned penetrating pore structures. The aspect ratio of CNF plays a crucial role in the pore structures of aerogels, directly dominating the final macroscopic properties of materials. Herein, three types of CNF with different aspect ratios were extracted through the 2,2,6,6-tetrmethylpiperidine-1-oxyl radical (TEMPO) oxidation process by changing the doses of oxidant. The corresponding anisotropic CNF/CNT aerogels were prepared by the unidirectional freeze-drying method and then their pore morphologies and properties were investigated in detail. The resulting aerogel with the shortest aspect ratio of CNF exhibited the densest porous structure, thereby obtaining the highest compressive strength of 110 kPa and elastic modulus of 383 kPa, while that containing the longest CNF possessed the highest thermal conductivity coefficient of 0.17 W m−1 K−1 and the worst thermal insulation. This research explored the relationship between the properties of the CNF/CNT aerogels and devisable pore structures caused by various aspect ratios of CNF, thus providing a new insight into the development of CNF/CNT aerogels with tunable performances.
科研通智能强力驱动
Strongly Powered by AbleSci AI