TiO2/Co-supported carbonaceous fiber electromagnetic wave absorbing material and preparation method and application thereof

A technology of absorbing materials and carbon fibers, which is applied in the fields of fiber chemical characteristics, rayon manufacturing, textiles and papermaking, etc., can solve the problems of inability to provide dielectric polarization loss and magnetic loss, difficulty in obtaining electromagnetic wave absorption performance, unfavorable practical applications and Industrial production and other problems, to achieve the effect of excellent electromagnetic wave absorption performance, excellent impedance matching performance, and unique microscopic shape

Active Publication Date: 2019-08-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the absorbing properties of carbon materials have been studied in depth, the inventor believes that as a conductance loss type absorbing material, carbon materials cannot provide appropriate dielectric polarization loss and magnetic loss, so the loss performance is not enough high
According to the impedance matching condition in the electromagnetic wave absorption theory, it is difficult to meet the impedance matching condition only by a single carbon material, and it is also difficult to obtain excellent electromagnetic wave absorption performance, which also limits its further development and application.
[0005] In addition, some current electromagnetic wave absorbing materials are mostly prepared by hydrothermal or solvothermal methods. This method is easy to operate for experimental research, but it cannot be used for large-scale preparation of materials, so it is not conducive to practical application and industrial production.
In addition, methods such as liquid phase exchange are expensive and cumbersome to operate, and are only suitable for laboratory research

Method used

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  • TiO2/Co-supported carbonaceous fiber electromagnetic wave absorbing material and preparation method and application thereof
  • TiO2/Co-supported carbonaceous fiber electromagnetic wave absorbing material and preparation method and application thereof
  • TiO2/Co-supported carbonaceous fiber electromagnetic wave absorbing material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A kind of TiO 2 The preparation method of the carbonaceous fiber electromagnetic wave absorbing material of Co load, comprises the steps:

[0055] (1) Dissolve 2.5mmol cobalt acetylacetonate in 10ml DMF, add 0.25ml anhydrous acetic acid after fully dissolving, then add 2.5mmol isopropyl titanate drop by drop, stir again after fully dissolving, then add 1.5g PVP, stir vigorously Obtain a homogeneous viscous solution;

[0056] (2) Under 12kV high-voltage electrostatic conditions, the viscous solution in step (1) is spun by a high-voltage electrospinning process to obtain organic fibers, which are dried at 50° C. for 12 hours, and then dried at 200° C. Insulated for 2h to carry out pre-oxidation treatment;

[0057] (3) Put the product after the pre-oxidation treatment in step (2) in a closed tube furnace, and in a nitrogen atmosphere, keep it at 700 ° C for 2 hours for high-temperature calcination treatment to obtain TiO 2 / Co loaded carbon fiber electromagnetic wave a...

Embodiment 2

[0059] A kind of TiO 2 The preparation method of the carbonaceous fiber electromagnetic wave absorbing material of Co load, comprises the steps:

[0060] (1) Dissolve 3mmol of cobalt nitrate in 10ml of DMF, add 0.3ml of anhydrous acetic acid after fully dissolving, then add 2mmol of isopropyl titanate drop by drop, fully dissolve again and then add 2g of PVP, stir vigorously to obtain a uniform viscous solution ;

[0061] (2) Under 10kV high-voltage electrostatic conditions, the viscous solution in step (1) is spun by a high-voltage electrospinning process to obtain organic fibers, which are dried at 45° C. for 24 hours, and then dried at 180° C. Insulated for 2h to carry out pre-oxidation treatment;

[0062] (3) Put the product after the pre-oxidation treatment in step (2) in a closed tube furnace, and in a nitrogen atmosphere, keep it at 650 ° C for 3 hours for high-temperature calcination treatment to obtain TiO 2 / Co loaded carbon fiber electromagnetic wave absorbing m...

Embodiment 3

[0064] A kind of TiO 2 The preparation method of the carbonaceous fiber electromagnetic wave absorbing material of Co load, comprises the steps:

[0065] (1) Dissolve 2mmol of cobalt nitrate in 10ml of DMF, add 0.2ml of anhydrous acetic acid after fully dissolving, then add 3mmol of tetrabutyl titanate drop by drop, fully dissolve again and then add 2.5g of PVP, stir vigorously to obtain uniform viscosity solution;

[0066] (2) Under 14kV high-voltage electrostatic conditions, the viscous solution in step (1) is spun by a high-voltage electrospinning process to obtain organic fibers, which are dried at 60° C. for 15 hours, and then dried at 150° C. Insulated for 3h to carry out pre-oxidation treatment;

[0067] (3) Put the product after the pre-oxidation treatment in step (2) in a closed tube furnace, and in a nitrogen atmosphere, heat it at 600°C for 5h for high-temperature calcination treatment to obtain TiO 2 / Co loaded carbon fiber electromagnetic wave absorbing materi...

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Abstract

The invention belongs to the field of electromagnetic wave absorbing materials, and particularly relates to a TiO2/Co-supported carbonaceous fiber electromagnetic wave absorbing material and a preparation method and application thereof. The electromagnetic wave absorbing material is of a three-dimensional network structure formed by interweaving one-dimensional fibers, the fibers are composed of acarbonaceous substrate and TiO2 and Co nanoparticles, wherein the TiO2 and Co nanoparticles are distributed in the carbonaceous substrate and the surface of the carbonaceous substrate. The method comprises the steps that (1) a cobalt source, an oxygen-containing organic titanium source and anhydrous acetic acid are prepared into an electrospinning viscous solution, wherein the electrospinning viscous solution comprises a carbon source, then spinning is performed on the viscous solution by adopting a high-pressure electrostatic spinning method to obtain nanofibers, and then the nanofibers aredried and pre-oxidized; (2) the pre-oxidized calcined nanofibers are placed in a protective atmosphere to convert cobalt ions in the cobalt source into elemental cobalt and convert the oxygen-containing organic titanium source into TiO2, and the TiO2/Co-supported carbonaceous fiber electromagnetic wave absorbing material is obtained. The TiO2/Co-supported carbonaceous fiber electromagnetic wave absorbing material and the preparation method and application thereof have the advantages that nanoscale composition is effectively performed on the TiO2, Co and carbon fibers, and the prepared materialhas excellent properties.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorbing materials, in particular to a TiO 2 / Co loaded carbon fiber electromagnetic wave absorbing material and its preparation method and application. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] In recent years, the rapid development of remote sensing detection technology, computer technology, and electronic communication technology has inevitably brought problems such as electromagnetic interference and electromagnetic radiation. At the same time, the increasing electromagnetic energy density causes electromagnetic pollution and damages human health. . In addition, el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/21D01F1/10
CPCD01F1/106D01F9/21
Inventor 刘久荣刘伟乔靖王凤龙汪宙吴莉莉
Owner SHANDONG UNIV
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