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Method for preparing multi-walled carbon nano-tubes/cerium dioxide nano-composite wave absorbing material

A technology of multi-walled carbon nanotubes and nanocomposites, which is applied in the fields of carbon nanotubes, carbon compounds, chemical instruments and methods, etc., can solve the problems of poor electromagnetic impedance matching characteristics, and the wave absorbing performance cannot meet commercial applications, and achieves absorption. Excellent wave performance, easy operation, and the effect of enhancing absorption capacity

Inactive Publication Date: 2019-01-04
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a single MWCNTs is used as a microwave absorbing material, the absorbing performance cannot meet the needs of commercial applications due to poor electromagnetic impedance matching characteristics.

Method used

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  • Method for preparing multi-walled carbon nano-tubes/cerium dioxide nano-composite wave absorbing material
  • Method for preparing multi-walled carbon nano-tubes/cerium dioxide nano-composite wave absorbing material
  • Method for preparing multi-walled carbon nano-tubes/cerium dioxide nano-composite wave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Take a 100mL beaker and add 60mL of deionized water to it;

[0032] 2. Add 6mmol (2.61g) cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 0), violent magnetic stirring (30min) is mixed evenly to solution;

[0033] 3. Keep stirring vigorously, add ammonia water drop by drop to adjust the pH of the mixed dispersion to 11;

[0034] 4. Pour the mixed dispersion liquid into a 100mL reactor, and conduct a hydrothermal reaction at 160°C for 12 hours;

[0035] 5. After the reaction, cool to room temperature, collect and separate by centrifugation, wash with deionized water until neutral, and then wash with absolute ethanol three times;

[0036] 6. Put it into a vacuum drying oven, dry at 60°C for 24 hours, and grind to obtain the final product.

[0037] The XRD spectrogram of embodiment 1 product sees figure 1 , see the Raman spectrum figure 2 . The powder product and paraffin in Example 1 are pressed into a coaxial sample with an outer diameter of 7.00mm, an inner dia...

Embodiment 2

[0039] 1. Take a 100mL beaker, add 30mg of MWCNTs treated with nitric acid reflux, then add 60mL of deionized water to it, and ultrasonically 0.5h, so that the MWCNTs are evenly dispersed in the water phase;

[0040] 2. Add 6mmol (2.61g) cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 0), violent magnetic stirring (30min) is mixed evenly to solution;

[0041] 3. Keep stirring vigorously, add ammonia water drop by drop to adjust the pH of the mixed dispersion to 11;

[0042] 4. Pour the mixed dispersion liquid into a 100mL reactor, and conduct a hydrothermal reaction at 160°C for 12 hours;

[0043] 5. After the reaction, cool to room temperature, collect and separate by centrifugation, wash with deionized water until neutral, and then wash with absolute ethanol three times;

[0044] 6. Put it into a vacuum drying oven, dry at 60°C for 24 hours, and grind to obtain the final product.

[0045] The XRD spectrum pattern of embodiment 2 product sees figure 1 , see the Raman spec...

Embodiment 3

[0047] 1. Take a 100mL beaker, add 45mg of MWCNTs treated with nitric acid reflux, then add 60mL of deionized water to it, and ultrasonically 1.0h, so that the MWCNTs are evenly dispersed in the water phase;

[0048] 2. Add 6mmol (2.61g) cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H2 0), violent magnetic stirring (30min) is mixed evenly to solution;

[0049] 3. Keep stirring vigorously, add ammonia water drop by drop to adjust the pH of the mixed dispersion to 11;

[0050] 4. Pour the mixed dispersion liquid into a 100mL reactor, and conduct a hydrothermal reaction at 160°C for 12 hours;

[0051] 5. After the reaction, cool to room temperature, collect and separate by centrifugation, wash with deionized water until neutral, and then wash with absolute ethanol three times;

[0052] 6. Put it into a vacuum drying oven, dry at 60°C for 24 hours, and grind to obtain the final product.

[0053] The XRD spectrum pattern of embodiment 3 product sees figure 1 , see the Raman spectr...

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Abstract

The invention discloses a multi-walled carbon nano-tubes / cerium dioxide (MWCNTs / CeO2) nano-composite wave absorbing material and a method for preparing the same. MWCNTs which are subjected to nitric acid reflux treatment are used as templates for the multi-walled carbon nano-tubes / cerium dioxide nano-composite wave absorbing material, and cerium nitrate hexahydrate is used as a precursor for the multi-walled carbon nano-tubes / cerium dioxide nano-composite wave absorbing material. The MWCNTs / CeO2 nano-composite wave absorbing material is prepared by the aid of one-step hydrothermal reaction. The multi-walled carbon nano-tubes / cerium dioxide nano-composite wave absorbing material and the method have the advantages that the method is green and environmentally friendly, and is free of optionalhazardous byproducts and low in cost, optional surfactants can be omitted, and processes for preparing the multi-walled carbon nano-tubes / cerium dioxide nano-composite wave absorbing material are simple; the multi-walled carbon nano-tubes / cerium dioxide nano-composite wave absorbing material which is a binary nano-composite material prepared by the aid of the method is high in electromagnetic wave absorbing capacity, wide in absorption frequency band and low in density and is thin; the content of the MWCNTs in the multi-walled carbon nano-tubes / cerium dioxide nano-composite wave absorbing material and the thicknesses of coatings can be adjusted, accordingly, electromagnetic waves with different wave bands can be effectively absorbed, and the multi-walled carbon nano-tubes / cerium dioxide nano-composite wave absorbing material and the method have important application values in the field of electromagnetic absorption and electromagnetic shielding.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic composite materials, and in particular relates to a preparation method of a multi-wall carbon nanotube-based rare earth compound nanocomposite wave-absorbing material. Background technique [0002] Electromagnetic wave absorbing materials (referred to as absorbing materials) are the main means to suppress electromagnetic pollution in space, manufacture stealth aircraft and construct microwave anechoic chambers. Traditional absorbing materials generally have a narrow absorption frequency band and high density, resulting in a narrow application range. Therefore, research on new absorbing materials, especially nanomaterials, such as one-dimensional carbon nanotube materials, has attracted much attention. [0003] Multi-walled carbon nanotubes (MWCNTs) are hollow tubular carbon nanomaterials with large aspect ratio, low density, excellent electrical conductivity and mechanical properties, whic...

Claims

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Application Information

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IPC IPC(8): C01B32/174C01B32/158C01F17/00C09K3/00
CPCC01P2002/72C01P2002/82C01P2004/03C09K3/00C01B32/158C01B32/174C01F17/206
Inventor 疏瑞文吴越张佳宾陈雅南孙瑞瑞袁佳
Owner ANHUI UNIV OF SCI & TECH
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