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(Co_(3)Fe(7)/CNF)气凝胶。研究表明,Co_(3)Fe(7)/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,Co_(3)Fe(7)/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。
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 Co_(3)Fe(7) carbon nanofibers(Co_(3)Fe(7)/CNF)aerogel by one-step carbon reduction method.The research shows that Co_(3)Fe(7)/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 Co_(3)Fe(7)/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.
作者
张子强
刘博文
方艳
刘庆雷
ZHANG Ziqiang;LIU Bowen;FANG Yan;LIU Qinglei(State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《中国材料进展》
CAS
CSCD
北大核心
2022年第7期563-572,共10页
Materials China
基金
国家自然科学基金资助项目(51672175,51772187,51271116)
上海市科委基础研究项目(18JC1410500,17ZR1441400,17520710600)
国家国际科技合作专项(2017YFE0113000)。
关键词
细菌纤维素
三维互联网状结构
钴铁碳纳米纤维气凝胶
吸波性能
bacterial cellulose
three-dimensional mesh interconnection structure
Co_(3)Fe(7)carbon nanofibers aerogel
microwave absorption performance
