Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (02): 191-198.doi: 10.13475/j.fzxb.20220806608

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of Fe/C porous carbon material and microwave absorption properties of coated cotton fabrics

DING Juan1(), LIU Yang1, ZHANG Xiaofei2, HAO Keqian1, ZONG Meng3, KONG Que4   

  1. 1. College of Textiles, Zhongyuan University of Technology, Zhengzhou, Henan 451191, China
    2. College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310012, China
    3. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
    4. College of Textile and Garment, Jiangsu College of Engineering and Technology, Nantong, Jiangsu 226007, China
  • Received:2022-08-16 Revised:2022-11-17 Online:2023-02-15 Published:2023-03-07

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Abstract:

Objective With the rapid development of modern society and the increase of electronic equipment, the problem of electromagnetic pollution are causing increasing attention. In order to reduce the influence of electromagnetic radiation on people's health, textiles can be functionalized to shield the electromagnetic absorption waves. In view of the above ideas, electromagnetic wave absorption materials can be mixed in the polymer solution in the fiber production, and can be coated onto the textiles as functional finishing.
Method To improve the electromagnetic wave absorption performance of coated cotton fabrics, an iron based magnetic metal-organic framework (Fe-MOF) material was prepared following the solution mixing method. Fe/C porous carbon material was prepared by a high temperature pyrolysis. Polyacrylate was used as a binder to the Fe/C porous carbon material on cotton fabrics to prepare a flexible textile composite.The phase structure, microstructure and surface elements, magnetic properties and thermodynamic properties of Fe-MOF material and Fe/C porous carbon material were characterized and evaluated by X-ray diffractometer, field emission scanning electron microscope, vibrating sample magnetometer and thermogravimetric analyzer, respectively. The Fe-MOF material and Fe/C porous carbon material have been successfully separately prepared. The electromagnetic microwave absorption properties of the Fe/C porous carbon material and coated cotton fabrics are analyzed with a vector network analyzer, respectively.
Results At frequency 4.6 GHz, the Fe/C porous carbon material has a minimum reflection loss of -60.4 dB, an effective bandwidth less than -10 dB of 1.4 GHz with thickness of 4.3 mm (Fig. 6). Synergistic effect of dielectric loss and magnetic loss enhances the electromagnetic microwave absorption properties of the Fe/C porous carbon material (Fig. 7). The Debye relaxation process and magnetic loss exist in the Fe/C porous carbon material according to the Debye theory and eddy current loss (Fig. 8), respectively. The reflection loss and impedance matching coefficient reflect the impedance matching performance of the Fe/C porous carbon material with different thickness. When the thickness is 4.3 mm, the matching coefficient is close to 1 (Fig. 9), indicating excellent impedance matching property of the Fe/C porous carbon material. Most incident waves enter the Fe/C porous carbon material, and the synergistic effect of dielectric loss and magnetic loss inside the material is optimum. The minimum reflection loss of the coated cotton fabric is -53.94 dB, the effective bandwidth less than -10 dB is the X-band, and the optimal coating thickness is 4.5 mm (Fig. 10). The thickness of the Fe/C porous carbon material-coated cotton fabric reaches more than 3.5 mm, and the coated cotton fabric has excellent electromagnetic microwave absorption properties (Fig. 10).
Conclusion The research reported in this paper not only provides a basis for the research of the microwave absorption properties of the MOF derivatives, but also provides a basis for the study of the microwave absorption properties of flexible textiles. However, there are still many aspects to be studied in the future, such as the synthesis of biomass-based carbon materials, other preparation methods of the MOF derivatives and different fabrics coated finishing. The research on the application of microwave absorption materials to textiles needs further exploration. For example, the effective absorption bandwidth less than -10 dB is 1.4 GHz, which needs further improvement. To enhance the optimal thickness corresponding to the optimal absorption intensity, the effective absorption bandwidth may be reduced by doping, changing ligands and other methods. Meanwhile, the intersection of material science and textile chemistry will be the key factor for the breakthrough of electromagnetic microwave absorption materials in the textile field.

Key words: iron based magnetic metal-organic framework, Fe/C porous carbon material, flexible textile composite, coated cotton fabric, microwave absorption property

CLC Number: 

  • TS195.5

Fig.1

Schematic of Fe/C porous carbon material and coated cotton fabric"

Fig.2

XRD spectrum of Fe-MOF and Fe/C porous carbon materials"

Fig.3

FESEM image of Fe-MOF material"

Tab.1

Proportion of C, O and Fe elements in Fe-MOF material%"

元素 质量分数 原子分数
C 50.29±0.22 63.19±0.28
O 34.74±0.40 32.77±0.38
Fe 14.97±0.38 4.04±0.10
合计 100.00 100.00

Fig.4

FESEM images of Fe/C porous carbon material"

Tab.2

Proportion of different elements in Fe/C porous carbon material%"

元素 质量分数 原子分数
C 47.40±0.26 71.45±0.39
O 15.45±0.28 17.48±0.32
Fe 32.90±0.57 10.67±0.19
Pt 4.26±0.25 0.40±0.02
合计 100.00 100.00

Fig.5

Hysteresis loop curves of Fe/C porous carbon material"

Tab.3

Magnetic property parameters of Fe/C porous carbon material"

材料
名称		 Ms/
(A· (m·g)-1)		 M c /
(A·m-1)		 M r s /
(A· (m·g)-1)		 参考
文献
Fe/C 3 916 19 120 884 本文
Fe3O4 4 211 40 007 2 396 [18]

Fig.6

Reflection loss curves of Fe/C porous carbon material. (a) Reflection loss curves with different thickness; (b) Three-dimensional reflection loss curves; (c) Contour reflection loss curves"

Fig.7

Complex permittivity, complex permeability, dielectric loss factor and magnetic loss factor of Fe/C porous carbon material.(a) ε' and ε″;(b) μ' and μ″;(c) tan δε and tanδμ"

Fig.8

Curves of ε'-ε″ (a) and C0 (b) for Fe/C porous carbon material"

Fig.9

RL and Mz value of Fe/C porous carbon material with different thicknesses"

Fig.10

Reflection loss curves of coated cotton fabric. (a) Reflection loss curves with different thickness;(b) Three-dimensional reflection loss curves; (c) Contour reflection loss curves"

Fig.11

Thermogravimetry curve of Fe-MOF material"

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