离子掺杂对海藻酸钠/SiO2气凝胶吸波性能的影响
Effect of ion doping on microwave absorbing properties of sodium alginate/SiO2 aerogels
李俊 1于名讯 2刘峣 3林龙 1勾雯启 1周帅1
作者信息
- 1. 河南工程学院 材料工程学院,郑州 450007
- 2. 中国兵器工业集团第五三研究所,济南 250031
- 3. 山东大学 材料科学与工程学院,济南 250013
- 折叠
摘要
随着电磁污染的加剧,吸波材料引起了研究者的关注,气凝胶具有轻质、多孔的特性赋予其成为理想吸波材料的潜质.以聚乙烯醇(PVA)和正硅酸乙酯(TEOS)为原料,静电纺丝制得PVA/SiO2 纳米纤维,高温碳化得到柔性SiO2 纳米纤维;将柔性SiO2 纳米纤维均化在海藻酸钠(SA)溶液中,冷冻干燥得到SA/SiO2气凝胶;分别引入铝硼硅(AlBSi)、FeCl3 作为掺杂剂得到SA/SiO2/AlBSi、SA/SiO2/FeCl3 气凝胶,对比分析 3种气凝胶吸波性能.结果表明:SA/SiO2 经FeCl3 掺杂后,SiO2 纳米纤维表面有小晶粒存在,这种块状颗粒结构能够产生多重反射和散射、界面极化,提高了气凝胶的介电损耗性能.并且加入FeCl3 后,气凝胶的磁损耗虚部增大,提高了气凝胶的磁损耗性能,使其整体吸波性能提高,当厚度为3 mm时,其最大的吸收峰值-23.85 dB在 14.42 GHz处达到,具有 1.3 GHz(13.82～15.12 GHz)的有效吸收带宽,是一种质轻、吸波性能良好的材料.
Abstract
With the intensification of electromagnetic pollution,absorbing materials have attracted the attention of researchers,and airgel has the potential to become an ideal absorbing material due to its light weight and porous characteristics.PVA/SiO2 nanofibers were prepared by electrospinning from polyvinyl alcohol(PVA)and ethyl orthosilicate(TEOS),the flexible SiO2 nanofibers were homogenized in sodium alginate(SA)solution and freezedried to obtain SA/SiO2 aerogels.SA/SiO2/AlBSi and SA/SiO2/FeCl3 aerogels were prepared by introducing AlBSi and FeCl3 as dopants,respectively.Microwave absorbing properties of three kinds of aerogels were analyzed.The results show that there are small particles on the surface of SiO2 nanofibers,which are the SA/SiO2 aerogel doped by FeCl3.This granular structure produces multiple reflection and scattering,interface polarization,which improves the dielectric loss performance of aerogels.After adding FeCl3,the imaginary part of the magnetic loss of the aerogel increases,which improves the magnetic loss performance of the aerogel.Thus,the overall wave absorption performance of aerogel is improved.When the thickness is 3 mm,its maximum absorption peak is-23.85 dB,reaching 14.42 GHz.It has an effective absorption bandwidth of 1.3 GHz(13.82-15.12 GHz).It is a light material with good wave absorption performance.
关键词
SiO2气凝胶/掺杂/介电损耗/多重驰豫/吸波性能Key words
SiO2 aerogel/doping/dielectric loss/multiple relaxation/wave absorbing performance引用本文复制引用
基金项目
河南省大学生创新创业项目(202211517021)
河南省大学生创新创业项目(202211517009)
出版年
2024
NETL
NSTL
万方数据