高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (6): 922-928.doi: 10.7503/cjcu20160846

• 中国第四届静电纺丝大会专题研究论文 • 上一篇    下一篇

锂锌铁氧体微纳米纤维的电纺制备及吸波性能

赵芳(), 王建江, 许宝才, 刘嘉玮, 高海涛   

  1. 军械工程学院先进材料研究所, 石家庄 050003
  • 收稿日期:2016-11-28 出版日期:2017-06-10 发布日期:2017-05-23
  • 作者简介:联系人简介: 赵 芳, 女, 讲师, 主要从事微纳米功能陶瓷方面的研究. E-mail: zhaofang19821106@163.com
  • 基金资助:
    河北省自然科学基金(批准号: E2015506011)资助.

Electrospinning Fabrication and Microwave Absorption Properties of Lithium Zinc Ferrite Micro/Nanofibers

ZHAO Fang*(), WANG Jianjiang, XU Baocai, LIU Jiawei, GAO Haitao   

  1. Advanced Material Institute, Mechanical Engineering College, Shijiazhuang 050003, China
  • Received:2016-11-28 Online:2017-06-10 Published:2017-05-23
  • Contact: ZHAO Fang E-mail:zhaofang19821106@163.com
  • Supported by:
    This paper is supported by the Natural Science Foundation of Hebei Province, China(No.E2015506011).

摘要:

采用静电纺丝技术结合后续热处理制备了尖晶石型Li0.35Zn0.3Fe2.35O4微纳米纤维. 利用差示扫描量热(DSC)-热重分析(TGA)、 傅里叶变换红外光谱(FTIR)、 X射线衍射(XRD)和场发射扫描电子显微镜(FESEM)等手段研究了煅烧温度(700, 800, 900, 1000 ℃)对产物物相和形貌的影响; 利用矢量网络分析仪分析了纤维状产物的吸波性能. 研究结果表明, Li0.35Zn0.3Fe2.35O4在700 ℃及以上温度煅烧后可生成单一尖晶石结构. 随着煅烧温度的升高, 产物依次呈现出微纳米纤维状、 三维网络状、 竹节状和颗粒状的微观形貌. 随着匹配厚度增加, 微纳米纤维状Li0.35Zn0.3Fe2.35O4的最低反射率向低频移动, 在8 GHz以下的最佳匹配厚度为6 mm, 在此厚度下吸波性能优良, 最低反射率为-26 dB, 对应的吸收频率为5.0 GHz, 低于-10 dB的吸收频带为4.0~8.0 GHz, 带宽为4 GHz.

关键词: Li0.35Zn0.3Fe2.35O4, 煅烧温度, 形貌, 微/纳米纤维, 吸波性能

Abstract:

Spinel-type Li0.35Zn0.3Fe2.35O4 micro/nanofibers were prepared through electrospinning and calcination technique. The crystalline phase and micromorphology of the samples calcined at various temperatures(700, 800, 900 and 1000 ℃) for 2 h in air were examined by differential scanning calorimetry(DSC)-thermalgravimetric analysis(TGA), Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM). Microwave absorption properties of Li0.35Zn0.3Fe2.35O4 micro/nanofibers were determined with a vector network analyzer. The results showed that pure spinel structure formed at 700 ℃ and above. As the temperature increased, Li0.35Zn0.3Fe2.35O4 exhibited micro/nanofibrous, 3D network, bamboo-like or granular morphology. The minimum reflectivity of Li0.35Zn0.3Fe2.35O4 micro/nanofibers at 700 ℃ moved to a low frequency as the matching thickness increased. The matching thickness of Li0.35Zn0.3Fe2.35O4 micro/nanofibers was 6 mm below 8 GHz, at which the microwave absorption properties were fine. The minimum reflectivity could reach -26 dB at 5.0 GHz, and the frequency band with reflectivity less than -10 dB was 4.0—8.0 GHz.

Key words: Li0.35Zn0.3Fe2.35O4, Calcination temperature, Morphology, Micro/nanofibers, Microwave absorption property

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