气凝胶
材料科学
复合材料
复合数
保温
纳米纤维
纳米孔
纤维素
细菌纤维素
纺纱
极限抗拉强度
热稳定性
纤维
化学工程
织物
纳米技术
工程类
图层(电子)
作者
Huazheng Sai,Meijuan Wang,Changqing Miao,Qiqi Song,Yutong Wang,Rui Fu,Yaxiong Wang,Litong Ma,Hao Yan
出处
期刊:Gels
[Multidisciplinary Digital Publishing Institute]
日期:2021-09-17
卷期号:7 (3): 145-145
被引量:33
摘要
Aerogels are nanoporous materials with excellent properties, especially super thermal insulation. However, owing to their serious high brittleness, the macroscopic forms of aerogels are not sufficiently rich for the application in some fields, such as thermal insulation clothing fabric. Recently, freeze spinning and wet spinning have been attempted for the synthesis of aerogel fibers. In this study, robust fibrous silica-bacterial cellulose (BC) composite aerogels with high performance were synthesized in a novel way. Silica sol was diffused into a fiber-like matrix, which was obtained by cutting the BC hydrogel and followed by secondary shaping to form a composite wet gel fiber with a nanoscale interpenetrating network structure. The tensile strength of the resulting aerogel fibers reached up to 5.4 MPa because the quantity of BC nanofibers in the unit volume of the matrix was improved significantly by the secondary shaping process. In addition, the composite aerogel fibers had a high specific area (up to 606.9 m2/g), low density (less than 0.164 g/cm3), and outstanding hydrophobicity. Most notably, they exhibited excellent thermal insulation performance in high-temperature (210 °C) or low-temperature (−72 °C) environments. Moreover, the thermal stability of CAFs (decomposition temperature was about 330 °C) was higher than that of natural polymer fiber. A novel method was proposed herein to prepare aerogel fibers with excellent performance to meet the requirements of wearable applications.
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