静电纺丝法制备La0.67Ba0.33MnO3微纳米纤维及其红外发射率研究

doi:10.7503/cjcu20160845

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (6): 929.doi: 10.7503/cjcu20160845

• 中国第四届静电纺丝大会专题研究论文 • 上一篇下一篇

静电纺丝法制备La_0.67Ba_0.33MnO₃微纳米纤维及其红外发射率研究

刘嘉玮, 王建江(), 赵芳, 许宝才

军械工程学院先进材料研究所, 石家庄 050003

收稿日期:2016-11-24 出版日期:2017-06-10 发布日期:2017-02-22
作者简介:联系人简介: 王建江, 男, 博士, 博士生导师, 主要从事红外雷达兼容隐身材料的研究. E-mail: JJWang63@heinfo.net
基金资助:
河北省自然科学基金(批准号: E2015506011)资助.

Electrospinning Preparation and Infrared-emissivity Properties of La_0.67Ba_0.33MnO₃ Micro/nanofibers

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

Advanced Material Institute, Ordnance Engineering College, Shijiazhuang 050003, China

Received:2016-11-24 Online:2017-06-10 Published:2017-02-22
Contact: WANG Jianjiang E-mail:JJWang63@heinfo.net
Supported by:
This paper is supported by the Natural Science Foundation of Hebei Province, China(No.E2015506011).

摘要/Abstract

摘要：

采用静电纺丝法结合溶胶-凝胶技术制备了钙钛矿型La_0.67Ba_0.33MnO₃微纳米纤维, 并利用差示扫描量热-热失重分析(DSC-TGA)、 X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)等技术对产物进行了表征, 利用IR-2红外发射率测试仪测试了La_0.67Ba_0.33MnO₃在280~370 K范围内的红外发射率. 结果表明, La_0.67Ba_0.33MnO₃在600 ℃时已形成钙钛矿结构. 随着煅烧温度的升高, La_0.67Ba_0.33MnO₃的形貌由纤维状向三维网络状转变, 并最终失去纤维形态. 在280~370 K范围内, La_0.67Ba_0.33MnO₃微纳米纤维的红外发射率随温度升高而升高, 由0.564增加至0.689. 利用钙钛矿材料双交换理论解释了这一现象, 并进一步探讨了其在红外发射率可变材料中的应用前景.

关键词: La_0.67Ba_0.33MnO₃, 微纳米纤维, 形貌, 红外发射率

Abstract:

Perovskite-type La_0.67Ba_0.33MnO₃ micro/nanofibers were fabricated through electrospinning technology. The fibers were characterized by means of differential scanning calorimetry-thermogravimetric analysis(DSC-TGA), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR) and scanning electron microscopy(SEM). The infrared emissivity of the fibers in the temperature range of 280—370 K was tested by IR-2 infrared-emissivity analyzer. The results show that perovskite structure is formed at 600 ℃. As the temperature increases, the morphology of samples changes from fiber to three-dimensional network structure, and eventually loses the fiber morphology. The infrared emissivity of La_0.67Ba_0.33MnO₃ fibers calcined at 600 ℃ rises from 0.564 to 0.689 with the increase of temperature, which can be explained by the theory of double-exchange. The prospect of La_0.67Ba_0.33MnO₃ fibers in variable infrared-emissivity materials is promising in the future.

Key words: La_0.67Ba_0.33MnO₃, Micro/nanofibers, Morphology, Infrared-emissivity

中图分类号:

O614

TrendMD:

刘嘉玮, 王建江, 赵芳, 许宝才. 静电纺丝法制备La_0.67Ba_0.33MnO₃微纳米纤维及其红外发射率研究. 高等学校化学学报, 2017, 38(6): 929.

LIU Jiawei, WANG Jianjiang, ZHAO Fang, XU Baocai. Electrospinning Preparation and Infrared-emissivity Properties of La_0.67Ba_0.33MnO₃ Micro/nanofibers. Chem. J. Chinese Universities, 2017, 38(6): 929.

图/表 7

Fig.1 DSC-TGA curves of precursor micro/nanofibers

Fig.2 XRD patterns of micro/nanofibers calcined at 400 ℃(a), 600 ℃(b) and 800 ℃(c)

Fig.3 FTIR spectra of precursor micro/nanofibers at room temperature(a) and after being calcined at 600 ℃(b) and 800 ℃(c)

Fig.4 SEM image of precursor micro/nano fibers

Fig.5 SEM images of La0.67Ba0.33MnO3 micro/nanofibers calcined at 600 ℃(A) and 800 ℃(B)

Fig.6 Infrared-emissivity curve of La0.67Ba0.33MnO3 fiber calcined at 600 ℃

Fig.7 Double exchange model of LaMnO3

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静电纺丝法制备La_0.67Ba_0.33MnO₃微纳米纤维及其红外发射率研究

Electrospinning Preparation and Infrared-emissivity Properties of La_0.67Ba_0.33MnO₃ Micro/nanofibers

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