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Beta-LiFe5O8 nano crystal-graphene composite material, as well as preparation method and application thereof

A graphene composite and composite material technology, applied in the field of wave absorbing materials, can solve the problems of the influence of wave absorbing performance, difficult to control size and dispersion, etc., and achieve the effect of cost saving and good wave absorbing performance

Inactive Publication Date: 2015-09-09
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, β-LiFe 5 o 8 Nanocrystals are relatively easy to agglomerate, and it is difficult to control their size and dispersion, so the absorbing performance is affected

Method used

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  • Beta-LiFe5O8 nano crystal-graphene composite material, as well as preparation method and application thereof
  • Beta-LiFe5O8 nano crystal-graphene composite material, as well as preparation method and application thereof
  • Beta-LiFe5O8 nano crystal-graphene composite material, as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0030] The above β-LiFe 5 o 8 The preparation method of nanocrystal-graphene composite material, comprises the following steps:

[0031] a) adding graphite oxide (GO) into N-methylpyrrolidone for dispersion to obtain a first dispersion. The amount of graphite oxide and N-methylpyrrolidone is selected based on the following iron acetylacetonate, so it is described after step b). The above-mentioned dispersion method may be ultrasonic dispersion, vibration dispersion or a combination thereof, preferably ultrasonic dispersion. The time of dispersion is not specifically limited in the present invention, and it is subject to obtaining a uniformly dispersed dispersion liquid. Generally speaking, it can be dispersed for 1 to 3 hours.

[0032] b) Iron acetylacetonate, lithium hydroxide monohydrate and octadecylamine are added to the above-mentioned first dispersion liquid to form a first mixed liquid, and the first mixed liquid is heated to a first preset temperature under stirring...

Embodiment 1

[0058] a) adding 40 mg of self-made graphite oxide (GO) to 40 mL of N-methylpyrrolidone, and ultrasonically dispersed for 2 hours to obtain the first dispersion;

[0059] b) 2mmol (0.7063g) iron acetylacetonate Fe(acac)3 , 8mmol (0.3357g) lithium hydroxide monohydrate (LiOH·H 2 (2) and 2g of octadecylamine were added to the above first dispersion, heated to 120°C while maintaining magnetic stirring, and kept for 30 minutes, and then continued to be heated to 202°C while maintaining magnetic stirring, and kept for 120 minutes to obtain the first reaction solution, adding 20 mL of ethanol to quench the first reaction solution.

[0060] c) Centrifuge the first reaction solution after the sudden stop treatment at a speed of 10,000 rpm for 5 minutes to obtain β-LiFe 5 o 8 The primary product of nanocrystalline-graphene composites, and then treated with n-hexane and acetone on β-LiFe 5 o 8 The initial product of the nanocrystalline-graphene composite material was alternately was...

Embodiment 2

[0062] a) Add 20 mg of self-made graphite oxide (GO) to 20 mL of N-methylpyrrolidone, and carry out ultrasonic dispersion for 2 hours to obtain the first dispersion;

[0063] b) 2mmol (0.7063g) iron acetylacetonate Fe(acac) 3 , 4mmol (0.1678g) lithium hydroxide monohydrate (LiOH·H 2 (2), 0.5 g of octadecylamine was added to the above-mentioned first dispersion, heated to 160° C. while maintaining magnetic stirring, and kept for 5 minutes, and then continued to be heated to 202° C. while maintaining magnetic stirring, and kept for 60 minutes to obtain the first For the reaction solution, 20 mL of ethanol was added to quench the first reaction solution.

[0064] c) Centrifuge the first reaction solution after the sudden stop treatment at a speed of 10,000 rpm for 5 minutes to obtain β-LiFe 5 o 8 The primary product of nanocrystalline-graphene composites, and then treated with n-hexane and acetone on β-LiFe 5 o 8 The initial product of the nanocrystalline-graphene composite ...

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Abstract

The embodiment of the invention discloses a beta-LiFe5O8 nano crystal-graphene composite material which is prepared by compounding beta-LiFe5O8 nano crystals and graphene, the graphene is in a flaky shape and is used as a substrate of the composite material, and the beta-LiFe5O8 nano crystals are dispersed on the graphene. The embodiment of the invention also discloses a preparation method of the beta-LiFe5O8 nano crystal-graphene composite material and an application of the beta-LiFe5O8 nano crystal-graphene composite material in the field of absorbing electromagnetic waves. In the prepared beta-LiFe5O8 nano crystal-graphene composite material, and beta-LiFe5O8 nano crystals are orderly embedded on a two-dimensional graphene nano sheet, so that the clustering phenomenon is avoided; compared with the beta-LiFe5O8 nano crystals, the wave absorption performance is better; in addition, the beta-LiFe5O8 nano crystal-graphene composite material is synthesized in one step by adopting a thermal-decomposition one-step method, so that simplicity and rapidness can be realized, and the cost is saved.

Description

technical field [0001] The invention relates to the field of absorbing materials, in particular to a β-LiFe 5 o 8 Nanocrystalline-graphene composite material, its preparation method and application. Background technique [0002] In recent years, the rapid development of radio communication technology is widely used in military, civil and industrial fields. In the military, the rapid development of radar detection technology poses a serious threat to the survival of military targets. Therefore, the development of stealth technology to shield the radar signals of warships, aircraft and other targets has become an important development direction of military technology. In addition, in civil and industrial applications, radio communication technology brings convenience to people's life, but also produces a large amount of electromagnetic radiation. The electromagnetic interference (EMI) produced by the deteriorating electromagnetic environment not only causes harm to people's...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 杨晓晶吴红孙根班
Owner BEIJING NORMAL UNIVERSITY
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