Preparation method of graphene composite aerogel absorbing material and application thereof

A technology of graphene composite and wave-absorbing materials, which is applied in the direction of graphene, electrical components, ferrous oxides, etc., can solve the problems of difficult expansion of effective bandwidth, mismatch of interface impedance, high dielectric loss, etc., and achieve Excellent absorbing performance, reduced density, and high absorbing efficiency

Active Publication Date: 2017-11-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Graphene has excellent electrical loss characteristics and ultra-low density, but the dispersion of pure two-dimensional graphene materials in the matrix is ​​poor, and the high conductivity of graphene makes its dielectric loss too high, resulti

Method used

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  • Preparation method of graphene composite aerogel absorbing material and application thereof
  • Preparation method of graphene composite aerogel absorbing material and application thereof
  • Preparation method of graphene composite aerogel absorbing material and application thereof

Examples

Experimental program
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Example Embodiment

[0041] Example 1

[0042] In this embodiment, control Fe 3 O 4 The mass ratio to pyrrole monomer is 1:0.5802, core-shell structure Fe 3 O 4 / Ppy (polypyrrole) and graphene oxide mass ratio is 3:1, the mass ratio of ethylenediamine to graphene oxide is 0.3-1:1 ;

[0043] The specific preparation steps of graphene composite aerogel are as follows:

[0044] 1. First weigh 2.7g FeCl 3 ·6H 2 Dissolve O in 80 mL of ethylene glycol, add 7.2 g of sodium acetate and 2.0 g of polyethylene glycol 400 while stirring, continue stirring until a uniform yellow viscous substance is formed, and put the yellow viscous substance into the hydrothermal reactor. Put it into an oven preheated at 200°C and maintain this temperature for 8 hours. After the reaction is over, cool naturally, separate with water magnetically, and wash three times with distilled water and ethanol successively, and vacuum dry at 60°C to obtain Fe 3 O 4 particle.

[0045] 2. Then weigh 0.5g Fe 3 O 4 The particles are dispersed in...

Example Embodiment

[0056] Example 2

[0057] The preparation steps of the graphene composite aerogel in this embodiment are as follows:

[0058] 1. Dissolve 4.31g 4,4'-diaminodiphenyl ether (ODA) in 51g DMAc (dimethylacetamide), add 4.69g pyromellitic anhydride (PMDA) after it is completely dissolved, keep it at 0℃ React for 5h, then add the above solution to distilled water for precipitation at 0°C, wash and dry. Then disperse the precipitate in water, add triethylamine dropwise until a uniform aqueous solution is formed, and configure it into a uniform water-soluble polyamic acid triethylamine salt solution with a solid content of 15% (in actual applications, the concentration of polymer A solution is in the range Within 5%-20wt%, the purpose of the invention can be achieved).

[0059] 2. Prepare 20 mL of graphene oxide aqueous dispersion with a concentration of 2 mg / mL (in specific applications, the concentration of GO aqueous dispersion can be selected in the range of 1.0-10 mg / mL), and add 6 g o...

Example Embodiment

[0063] Example 3

[0064] The preparation steps of the graphene composite aerogel in this embodiment are as follows:

[0065] 1. Fe 3 O 4 The preparation of nanoparticles is the same as that of step 1 in Example 1.

[0066] 2. Weigh 0.5g Fe 3 O 4 Disperse the particles in distilled water, then weigh 9g FeCl 3 Continue to dissolve and react for 3h. 20 mL of a 5.8% aqueous solution of sodium dodecyl sulfonate, a surfactant, was added, and 0.4 mL of aniline monomer (with a mass of about 0.4080 g) was added dropwise, and reacted for 12 hours. Hydromagnetic separation, washing and drying to obtain Fe 3 O 4 -PANI core-shell particles (the thickness of the shell is 80-100nm).

[0067] 3. Prepare 20 mL of 3 mg / mL GO aqueous solution, add 20 mg of ascorbic acid and 120 mg of the above core-shell particles, react at 90°C for 6 hours to obtain graphene composite hydrogel, and finally freeze-dry to obtain graphene composite aerogel. The freeze-drying parameters are -50℃, 20Pa, 48h.

[0068] The ...

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Abstract

The invention discloses a preparation method of a graphene composite aerogel absorbing material and application thereof. The material is obtained by one-step reduction self-assembled reaction on reduced graphene oxide, a polymer A and magnetic nano particles which wrap a polymer B. The absorbing material is low in density and high in absorbing strength, effectively absorbs bandwidth, and has excellent absorbing property on an X wave band. In the absorbing material, the content of graphene is low, the cost is low, and therefore, the graphene composite aerogel absorbing material has wide application potential and market prospect in the field of invisibility of aircrafts, electromagnetic shielding of radar and communication equipment, and electromagnetic safety protection.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene composite airgel wave-absorbing material, belonging to the field of electromagnetic wave-absorbing material preparation. technical background [0002] With the rapid development of the information age in the 21st century, various electronic and electrical equipment emerge in an endless stream, providing great assistance for people's daily life and social infrastructure. However, limited by the current level of science and technology, the electromagnetic radiation and interference problems that are inevitably generated with the complicated equipment work also affect people's living environment. Excessive disordered electromagnetic radiation will cause damage to equipment and human body, forming electromagnetic wave pollution. This imperceptible environmental pollution has brought a series of social problems, which not only affects communication, but even directly threatens huma...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01G49/08C08G73/06H05K9/00
CPCC01G49/08C01P2002/72C01P2002/82C01P2004/03C01P2004/04C08G73/0611H05K9/0081
Inventor 李金焕刘彬许艳芳任嘉慧
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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