Engineering bacteria for high-performance three-dimensional carbon nanofiber aerogel
Engineering bacteria for high-performance three-dimensional carbon nanofiber aerogel
复制标题
高性能三维碳纳米纤维气凝胶工程菌
DOI：
10.1016/j.carbon.2021.07.021
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发表时间：
2021-10
期刊：
影响因子：
10.9
通讯作者：
Yang Zhiwei
中科院分区：
文献类型：
--
作者：
Wang Jie;Wan Yizao;Xun Xiaowei;Zheng Liyun;Zhang Quanchao;Zhang Zhaohui;Xie Yu-Xin;Luo Honglin;Yang Zhiwei
与碳纳米管（CNT）和石墨烯（GE）气凝胶相比，三维（3D）碳纳米纤维（CNF）气凝胶具有高度可压缩性、循环应变弹性、抗蠕变和抗疲劳等特点，其合成仍然极具挑战性。本文提出了一种革命性的绿色可扩展生物合成方法，通过该合成方法，制备了一种新型的3D CNF气凝胶，该气凝胶来源于天然细菌纤维素（BC）及其母细菌。制备的CNF气凝胶具有优异的机械回弹性、超低的能量损失系数和出色的循环稳定性，是目前报道的CNT和GE气凝胶中性能最好的。此外，CNF气凝胶具有优异的抗蠕变和抗疲劳性能，压缩后电导率变化敏感。令人惊讶的是，制备的三维CNF气凝胶表现出超亲水性。这些优异的性能归功于炭化BC基质中存在的炭化细菌，它们作为交联剂增强气凝胶和缓冲液以储存变形能。本研究提出了一种突破性的方法，以天然生物质材料为原料构建高性价比的三维CNF气凝胶。
Compared with carbon nanotube (CNT) and graphene (GE) aerogels, the synthesis of three-dimensional (3D) carbon nanofiber (CNF) aerogels that are highly compressible, resilient under cyclic strains, and creep and fatigue resistant remains extremely challenging. Herein, a revolutionary green and scalable biosynthesis is presented, by which a novel 3D CNF aerogel derived from natural bacterial cellulose (BC) decorated with its mother bacteria is created. The as-prepared CNF aerogel possesses excellent mechanical resilience, ultra-low energy loss coefficient, and outstanding cycling stability, which are by far among the best performances for CNT and GE aerogels reported thus far. Furthermore, the CNF aerogel exhibits excellent creep and fatigue resistance and sensitive electrical conductivity change upon compression. Surprisingly, the as-prepared 3D CNF aerogel exhibits superhydrophilicity. These superb properties are attributed to the existing carbonized bacteria in the carbonized BC matrix that serve as crosslinks to strengthen the aerogel and buffers to store deformation energy. This study presents a breakthrough method for the construction of superb and cost-effective 3D CNF aerogel from natural biomass material.
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