Preparation method of carbon nanotube composite wave-absorbing material

A carbon nanotube composite and wave-absorbing material technology, which is applied in the field of carbon nanotubes, can solve the problem that microwave absorbers cannot achieve good wave-absorbing effects, and achieve the effect of avoiding bonding into blocks

Inactive Publication Date: 2020-08-14
JIANGXI YUEAN SUPERFINE METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The single use of carbon nanotubes as a microwave absorber cannot achieve a good microwave absorption effect. Only by exploring the microwave absorption mechanism of carbon nanotubes and compounding them with other materials with different properties can the required comprehensive performance be obtained, and efficient and practical microwave absorbing material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Ferrite Dy 0.4 Ni 0.4 Fe 2 o 4 Preparation: FeCl 3 ·6H 2 O, Ni(NO 3 ) 2 and Dy 2 o 3 According to molecular formula Dy 0.4 Ni 0.4 Fe 2 o 4 The stoichiometric ratio was added to deionized water and stirred, then 1mol / L NaOH solution was added to adjust the pH to 11, the temperature was raised to 90°C for 5h, and the temperature was lowered to room temperature, then washed with deionized water until neutral by suction filtration, and dried at 80°C for 4h. Grind to get Dy 0.4 Ni 0.4 Fe 2 o 4 Ferrite nanoparticles;

[0024] (2) Pretreatment of carbon nanotubes: heat the multi-walled carbon nanotubes to 525°C for 2 hours, then add mixed acid (concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 1:3) for ultrasonic vibration for 35 minutes, and then heat to 85 After stirring for 3 hours at ℃, cool to room temperature, then wash with deionized water until neutral, dry at 80 ℃ for 4 hours, and grind to obtain pretreated carbon nano...

Embodiment 2

[0028] (1) Ferrite Dy 0.4 Ni 0.4 Fe 2 o 4 Preparation: FeCl 3 ·6H 2 O, Ni(NO 3 ) 2 and Dy 2 o 3 According to molecular formula Dy 0.4 Ni 0.4 Fe 2 o 4 The stoichiometric ratio was added to deionized water and stirred, then 1.5mol / L NaOH solution was added to adjust the pH to 12, the temperature was raised to 100°C for 4 hours, and the temperature was lowered to room temperature, then washed with deionized water until neutral by suction filtration, and dried at 90°C for 3 hours , grinding to get Dy 0.4 Ni 0.4 Fe 2 o 4 Ferrite nanoparticles;

[0029] (2) Pretreatment of carbon nanotubes: heat the multi-walled carbon nanotubes to 500°C for 3 hours, then add mixed acid (concentrated nitric acid and concentrated sulfuric acid at a volume ratio of 1:3) for ultrasonic vibration for 30 minutes, and then heat to 80 After stirring for 4 hours at ℃, cool to room temperature, then wash with deionized water until neutral, dry at 90 ℃ for 3 hours, and grind to obtain pretrea...

Embodiment 3

[0033] (1) Ferrite Dy 0.4 Ni 0.4 Fe 2 o 4 Preparation: FeCl 3 ·6H 2 O, Ni(NO 3 ) 2 and Dy 2 o 3 According to molecular formula Dy 0.4 Ni 0.4 Fe 2 o 4 The stoichiometric ratio was added to deionized water and stirred, then 2.5mol / L KOH solution was added to adjust the pH to 11, the temperature was raised to 110°C for 6 hours, and the temperature was lowered to room temperature, washed with deionized water until neutral by suction filtration, and dried at 70°C for 5 hours , grinding to get Dy 0.4 Ni 0.4 Fe 2 o 4 Ferrite nanoparticles;

[0034] (2) Pretreatment of carbon nanotubes: heat multi-walled carbon nanotubes to 550°C for 1 hour, then add mixed acid (concentrated nitric acid and concentrated sulfuric acid at a volume ratio of 1:3) for ultrasonic vibration for 40 minutes, and then heat to 90 After stirring for 3 hours at ℃, cool to room temperature, then wash with deionized water until neutral, dry at 70 ℃ for 5 hours, and grind to obtain pretreated carbon ...

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Abstract

The invention discloses a preparation method of a carbon nanotube composite wave-absorbing material. The method comprises the following steps of: (1) preparing ferrite Dy0.4Ni0.4Fe2O4; (2) pretreatingcarbon nanotubes; (3) respectively adding the ferrite Dy0.4Ni0.4Fe2O4 particles and the pretreated carbon nanotubes into an ethylene glycol solution, then adding a surfactant, fully stirring, addingan ammonium persulfate solution, carrying out a hydrothermal reaction for 3-5 hours, then centrifuging, washing with deionized water to be neutral, and drying to obtain the Dy0.4Ni0.4Fe2O4 / CNTs composite wave-absorbing material. Impure carbon is removed through ultrasonic oscillation of the carbon nanotubes in mixed acid; and the ferrite nanoparticles and the pretreated carbon nanotubes are addedinto the ethylene glycol solution to realize particle dispersion, and the surfactant CTAB / CTAC is added to better disperse the ferrite nanoparticles and the pretreated carbon nanotubes in an ethyleneglycol system, so that bonding agglomeration among the particles is avoided. According to the invention, the ferrite Dy0.4Ni0.4Fe2O4 is used for coating the carbon nanotubes, so that the novel Dy0.4Ni0.4Fe2O4 / CNTs composite wave-absorbing material is prepared.

Description

technical field [0001] The invention belongs to the technical field of carbon nanotubes, and in particular relates to a preparation method of a carbon nanotube composite wave-absorbing material. Background technique [0002] At present, with the rapid development of electronic technology, electronic, electrical equipment or other information systems have been more and more widely used in various fields of people's daily production and life. The wide application and development of electronic equipment, while bringing great convenience to people's lives, its electromagnetic radiation has also had a great impact on human health and the environment on which we live. With the development of electronic products in the direction of high frequency, high integration and miniaturization, the electromagnetic compatibility and electromagnetic interference problems of electronic products are becoming more and more prominent, so higher requirements are put forward for the electromagnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 王兵李博于缘宝李上奎朱小琪朱敏峰邹海平李显信
Owner JIANGXI YUEAN SUPERFINE METAL
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