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Mesoporous hollow carbon spheres and production and application in electromagnetic absorption thereof

A hollow carbon sphere, mesoporous technology, applied in nano carbon, electrical components, magnetic field/electric field shielding and other directions, can solve the problems of low yield, cumbersome steps, etc., and achieve the effect of low production cost, simple process and reduced density

Pending Publication Date: 2019-11-12
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the synthesis preparation, the steps are often cumbersome and the yield is low. Some even need some shape control agents to guide the crystal growth and qualitative crystallization during the reaction process, and finally present a special structure.
In terms of yield, tend to be lower

Method used

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  • Mesoporous hollow carbon spheres and production and application in electromagnetic absorption thereof
  • Mesoporous hollow carbon spheres and production and application in electromagnetic absorption thereof
  • Mesoporous hollow carbon spheres and production and application in electromagnetic absorption thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Take 50ml of ethanol, 7ml of distilled water, 3ml of ammonia water, and 2ml of tetraethyl orthosilicate in a beaker and stir for 30 minutes. At this time, the solution appears milky white. Add 0.2g of resorcinol and 0.5ml of formaldehyde with a volume fraction of 37%. Stir for 10 hours to obtain an orange solution. After centrifugation and washing, dry at 60°C to obtain an orange powder. Carbonize the powder in an environment at 850°C for 6 hours and a heating rate of 2°C / min to obtain carbon-coated SiO 2 Composite material, then add 3g NaOH to remove SiO 2 , to obtain hollow carbon spheres.

[0030] Step 2: Dissolve 30 mg of the hollow carbon spheres obtained in Step 1 in 10 mL of HF solution (30% by volume), and then sonicate for 10 min to make them uniformly dispersed.

[0031] Step 3: The mixed dispersion obtained in step 2 was stirred at a constant temperature of 50°C for 3h, and the remaining carbon material in the mixed dispersion was collected by suctio...

Embodiment 2

[0033] Step 1: Take 30ml of ethanol, 4mL of distilled water, 2ml of ammonia water, and 1ml of tetraethyl orthosilicate, put them in a beaker and stir for 20 minutes. At this time, the solution is milky white. Add 0.5g of resorcinol and 2mL of formaldehyde with a volume fraction of 37%. , stirred for 8 hours to obtain an orange solution, dried at 70°C after centrifugal washing to obtain an orange powder, and carbonized the powder in an environment of 850°C for 3 hours and a heating rate of 10°C / min to obtain carbon-coated SiO 2 Composite material, then add 2g NaOH to remove SiO 2 , to obtain hollow carbon spheres.

[0034] Step 2: Dissolve 20 mg of the hollow carbon spheres obtained in Step 1 in 50 mL of HF solution (30% by volume), and then sonicate for 20 min to make them uniformly dispersed.

[0035] Step 3: The mixed dispersion obtained in step 2 was stirred at a constant temperature of 60°C for 4 hours, the remaining carbon material in the mixed dispersion was collected b...

Embodiment 3

[0037] Step 1: Take 10ml of ethanol, 2mL of distilled water, 1ml of ammonia water, and 2ml of tetraethyl orthosilicate, put them into a clean beaker, stir for 20min, the solution is milky white at this time, add 0.1g of resorcinol, the volume fraction of 1mL is 37% formaldehyde, stirred for 8 hours to obtain an orange solution, dried at 60°C after centrifugal washing to obtain an orange powder, and carbonized the powder in an environment of 850°C for 5 hours at a heating rate of 5°C / min to obtain a carbon coated Coated SiO 2 Composite material, then add 1g NaOH to remove SiO 2 , to obtain hollow carbon spheres.

[0038] Step 2: Dissolve 20 mg of the hollow carbon spheres obtained in Step 1 in 70 mL of HF solution (30% by volume), and then sonicate for 20 min to make them uniformly dispersed.

[0039] Step 3: The mixed dispersion obtained in step 2 was stirred at a constant temperature of 60°C for 2 hours, and the remaining carbon material in the mixed dispersion was collecte...

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Abstract

The invention belongs to the technical field of electromagnetic absorption materials, and particularly relates to mesoporous hollow carbon spheres and production and application in electromagnetic absorption thereof. A silicon dioxide hard template method is used for producing amorphous carbon spheres with hollow structures, and then by carrying out a reaction of hydrofluoric acid and polar groupson surfaces of the carbon spheres, mesoporous structures which are uniform in size are produced on the surfaces of the carbon spheres, so that the mesoporous hollow carbon spheres are obtained. According to the mesoporous hollow carbon spheres and production and application in electromagnetic absorption thereof, by carrying out the reaction of the hydrofluoric acid and the polar groups on the surfaces of the carbon spheres, the mesoporous structures which are uniform in size are produced on the surfaces of the carbon spheres. The absorption performance is enhanced. The mesoporous hollow carbon spheres and production and application in electromagnetic absorption thereof have the advantages that a technology process is simple, a production cycle is short, and the like, and compared with equivalent hollow carbon spheres, the mesoporous hollow carbon spheres produced by adopting a method have an enhanced graphitization degree and enhanced electromagnetic absorption performance.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic absorption materials, and in particular relates to a mesoporous hollow carbon sphere and its preparation and application in electromagnetic absorption. Background technique [0002] With the progress of the times and the development of science and technology, the application of electronic and electrical equipment in civilian and military fields has become more and more extensive, which has brought convenience to social production and life. However, at the same time, the electromagnetic radiation generated during the working process of electronic and electrical equipment Caused serious electromagnetic pollution, resulting in adverse effects (ACS Appl. Mater. Interfaces, 6, 7471-7478 (2014)). Research and development of high-efficiency new wave-absorbing materials is an effective means to alleviate the problem of electromagnetic wave pollution. In recent years, in the research of microwave ...

Claims

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Application Information

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IPC IPC(8): C01B32/15H05K9/00
CPCC01B32/15H05K9/0081
Inventor 吴广磊王建伟贾梓睿冯爱玲张传辉
Owner QINGDAO UNIV
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