高吸波性能细菌纤维素Co3Fe7/CNF气凝胶的制备-中国材料进展

文章信息/Info

Title:: Preparation of Co3Fe7/ Carbon Nanofibers Aerogel with High Absorption Properties Derived from Bacterial Cellulose

Author(s):: ZHANG Ziqiang; LIU Bowen; FANG Yan; LIU Qinglei; (State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China)

Keywords:: bacterial cellulose; three-dimensional mesh interconnection structure; Co3Fe7 carbon nanofibers aerogel; microwave absorption performance

摘要:: 随着电磁污染的日益严重，“薄、宽、轻、强”的新型复合微波吸收材料受到了人们的广泛关注。然而，新型复合微波吸收材料的制备工艺相对复杂、机械加工性能较差、电磁性能难以调控，阻碍了其发展和应用。以来源丰富、具有三维互联网状结构的可再生资源——细菌纤维素为碳源，利用其表面具有的大量羟基吸附钴铁离子，再通过一步碳化还原法制备了钴铁碳纳米纤维 (Co3Fe7/CNF)气凝胶。研究表明，Co3Fe7/CNF气凝胶呈三维互联网状结构，具有高孔隙、超低密度和高微波吸收性能。当碳化温度为900 ℃时，Co3Fe7/CNF气凝胶与石蜡混合物在低负载（质量分数约为3%）、薄厚度（3.5 mm）下的反射损耗为-47.5 dB，表明细菌纤维素生物质材料在满足“薄、宽、轻、强”为导向的微波吸收材料方面显示出巨大的潜力。

Abstract:: With the increasingly serious electromagnetic pollution, “thin, wide, light and strong” new composite microwave absorbing materials have attracted extensive attention. However, the development and application of new composite microwave absorbing materials are hindered by comparatively complex fabrication process, weak machinability and difficulty in regulation of electromagnetic properties. Here, as a rich renewable resource with a three-dimensional mesh interconnection structure, bacterial cellulose (BC), whose surface is rich in hydroxyl groups for absorbing cobalt and iron ions, is used as a carbon source to prepare Co3Fe7 carbon nanofibers (Co3Fe7/CNF) aerogel by one-step carbon reduction method. The research shows that Co3Fe7/CNF aerogel has three-dimensional mesh interconnection structure, high porosity, ultra-low density and high microwave absorption performance. When the carbonization temperature is 900 ℃, the reflection loss (RL) of Co3Fe7/CNF aerogel and paraffin mixture with low load (~3wt%) and thin thickness (3.5 mm) is -47.5 dB, indicating that BC biomass materials show great potential in “thin, wide, light and strong” microwave absorbing materials.