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Carbon nanotube composite barium titanate wave absorbing nano-material and preparation method therefor

A nano wave-absorbing material and composite barium titanate technology, which is applied to electrical components, antennas, etc., can solve the problems of narrow absorption frequency band and weak absorption intensity, and achieve the effects of wide absorption frequency band, low production cost and simple process

Inactive Publication Date: 2015-10-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, barium titanate itself has disadvantages such as weak absorption intensity and narrow absorption frequency band.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation method of the carbon nanotube composite barium titanate nano wave-absorbing material of the present invention comprises the following steps:

[0019] 1) Pretreatment of the carbon nanotube powder: disperse the carbon nanotube powder into a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, sonicate, wash, centrifuge, and dry;

[0020] 2) Dissolving tetrabutyl titanate in absolute ethanol and stirring thoroughly to obtain a solution A with a concentration of 0.5--1mol / L;

[0021] 3) dissolving barium acetate in deionized water, adding polyvinylpyrrolidone as a dispersant, and fully stirring to obtain a B solution with a concentration of 1--1.5mol / L;

[0022] 4) Add glacial acetic acid and B solution sequentially to solution A, wherein the molar ratio of tetrabutyl titanate, barium acetate, and glacial acetic acid is 1:1:0.05--1:1:0.1, and stir vigorously to form a transparent sol;

[0023] 5) The pretreated car...

Embodiment 1

[0028] 1) Pretreatment of the carbon nanotube powder: disperse the carbon nanotube powder into a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, sonicate, wash, centrifuge, and dry;

[0029] 2) Dissolve 5.108g of tetrabutyl titanate in 20mL of absolute ethanol to obtain A solution;

[0030] 3) Dissolve 6.807g of barium acetate in 20mL of deionized water, add polyvinylpyrrolidone as a dispersant, and fully stir to obtain B solution;

[0031] 4) Add glacial acetic acid and B solution successively to A solution, stir vigorously to form a transparent sol;

[0032] 5) Take the pretreated carbon nanotube powder with a mass ratio of 0.0031 g to barium titanate and disperse it into the sol obtained in step 4) after ultrasonication;

[0033] 6) Put the sol in step 5) in a water bath at 50-70°C for 24 hours to keep it warm to form xerogel, and grind it into powder;

[0034] 7) Putting the powder obtained in step 6) into a tube furnace wit...

Embodiment 2

[0036] 1) Pretreatment of the carbon nanotube powder: disperse the carbon nanotube powder into a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, sonicate, wash, centrifuge, and dry;

[0037] 2) Dissolve 5.108g of tetrabutyl titanate in 20mL of absolute ethanol to obtain A solution;

[0038] 3) Dissolve 6.807g of barium acetate in 20mL of deionized water, add polyvinylpyrrolidone as a dispersant, and fully stir to obtain B solution;

[0039] 4) Add glacial acetic acid and B solution successively to A solution, stir vigorously to form a transparent sol;

[0040] 5) Take the pretreated carbon nanotube powder with a mass ratio of 0.0061 g to barium titanate and disperse it into the sol obtained in step 4) after ultrasonication;

[0041] 6) Put the sol in step 5) in a water bath at 50-70°C for 24 hours to keep it warm to form xerogel, and grind it into powder;

[0042] 7) Putting the powder obtained in step 6) into a tube furnace wit...

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Abstract

Provided are a carbon nanotube composite barium titanate wave absorbing nano-material and a preparation method therefor. The wave absorbing nano-material is composed of carbon nanotube powder and barium titanate according to a weight ratio of 0.026-0.111 through combination. Carbon nanotube powder is dispersed in a mixed solution of concentrated sulfuric acid and nitric acid with a volume ratio of 3:1 and pretreatment is carried out; tetrabutyl titanate is dissolved in absolute ethyl alcohol, and a solution A with a concentration of 0.5-1mol / L; barium acetate is dissolved in deionized water, polyvinylpyrrolidone is added as a dispersant, and a solution B with a concentration of 1-1.5mol / L; glacial acetic acid and the solution B are added in the solution A in order and transparent sol is prepared; carbon nanotube powder after pretreatment is weighed and dispersed in the transparent sol, and the mass ratio of the carbon nanotube powder to barium titanate is 0.026-0.111; the mixture is placed in a water bath kettle, heat insulation is carried out for 24h, and the mixture is ground into powder; the above powder is placed in a tubular furnace with nitrogen as a protection atmosphere, calcination is carried out for 2h, and the finished product is obtained. The prepared carbon nanotube composite barium titanate wave absorbing nano-material is advantaged by light weight, wide wave absorbing frequency band and strong wave performances.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing material. In particular, it relates to a carbon nanotube composite barium titanate nano wave-absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of electronics and information technology, and the increasing popularity of wireless networks and electronic devices, various electromagnetic waves are flooding our living space. In the military field, stealth technology is an important technical means to achieve information acquisition and anti-acquisition, and to strive for the initiative in war in future information warfare. Therefore, the study of absorbing materials is of great significance to both civilian and military fields. [0003] Barium titanate, as a traditional wave-absorbing material, has excellent ferroelectricity, dielectricity and piezoelectricity, and is a dielectric wave-absorbing material with excellent performance. At th...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
Inventor 郑冀宋阳阳孙明赵爽
Owner TIANJIN UNIV
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