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Method for preparing manganese ferrite-graphene composite materials

A technology of composite materials and graphene, applied in the direction of nanotechnology, iron compounds, chemical instruments and methods for materials and surface science, can solve the problems of poor absorbing performance and achieve good absorbing performance

Inactive Publication Date: 2016-08-24
BEIJING NORMAL UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the manganese ferrite-graphene composite material is prepared by a two-step method of co-precipitation and high-temperature calcination, but the manganese ferrite particle size in the manganese ferrite-graphene composite material prepared by this method is relatively large, with an average diameter of 50-80nm, resulting in poor absorbing performance of manganese ferrite-graphene composite material, the maximum reflected magnetic loss value (RL max ) is about -16.1dB

Method used

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  • Method for preparing manganese ferrite-graphene composite materials

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[0029] figure 1 A schematic flow diagram of a preparation method of a manganese ferrite-graphene composite material provided by an embodiment of the present invention, comprising the following steps:

[0030] S101: adding graphite oxide to 2-pyrrolidone and dispersing it;

[0031] Wherein, the graphite oxide refers to a compound composed of carbon, hydrogen, and oxygen elements with variable ratios of substances. Described graphite oxide can be obtained by preparing graphite oxide with a strong oxidant, specifically, it can be prepared by using the improved Hummers method (this method is recorded in the reference book "Graphene——structure, preparation, etc.) written by Zhu Hongwei, Xu Zhiping, Xie Dan, etc. Method and Performance Characterization" (Tsinghua University Press, first printing in November 2011), paragraph 2, page 32). The mass volume ratio of the graphite oxide to the 2-pyrrolidone is 0.8 mg / mL˜1.2 mg / mL, preferably, the mass volume ratio of the graphite oxide t...

Embodiment 1

[0042] Weigh 40mg of graphite oxide and 40mL of 2-pyrrolidone in a 50mL beaker, ultrasonically disperse for about 2h to obtain a brown mixed solution; Octamine was added to the above brown solution, the mixture was first heated to 120°C and maintained at this temperature for 30 minutes, then the temperature was raised to 245°C, maintained at this temperature for 2 hours, and magnetic stirring was maintained all the time. Then, 20 mL of ethanol was added to quench the reaction, and the temperature of the reaction system was rapidly lowered to room temperature. Finally, the reaction product was separated by centrifugation, washed alternately with n-hexane, acetone, and ethanol, and the product was vacuum-dried at 40°C.

Embodiment 2

[0044] Weigh 40mg of graphite oxide and 50mL of 2-pyrrolidone in a 50mL beaker, ultrasonically disperse for about 2h to obtain a brown mixed solution; Octadecylamine was added to the above brown solution, the mixture was first heated to 100°C and maintained at this temperature for 50 minutes, then raised to 245°C, maintained at this temperature for 5 hours, and kept magnetically stirred. Then, 20 mL of ethanol was added to quench the reaction, and the temperature of the reaction system was rapidly lowered to room temperature. Finally, the reaction product was separated by filtration, washed alternately with n-hexane, acetone, and ethanol, and the product was vacuum-dried at 40°C.

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Abstract

An embodiment of the invention discloses a method for preparing manganese ferrite-graphene composite materials. The method includes steps of 1), adding graphite oxide into 2-pyrrolidone and dispersing the graphite oxide; 2), adding iron acetylacetonate, manganeseacetylacetonate and octadecylamine into the 2-pyrrolidone to obtain solution, heating the solution until the temperature of the solution reaches 100-150 DEG C, maintaining the temperature of the solution unchanged for 20-50 min, then heating the solution until the solution is boiling and flows back, and maintaining the temperature of the solution unchanged for 1-5 h; 3), adding organic solvents into the solution to suddenly stop reaction, separating reaction products and washing and drying the reaction products. A mass ratio of the graphite oxide to the iron acetylacetonate is 0.1-0.2; a mass ratio of the graphite oxide to the manganeseacetylacetonate is 0.3-0.45; a mass ratio of the graphite oxide to the octadecylamine is 1:80-1:40. The method has the advantages that the average diameters of manganese ferrite nano-particles in the manganese ferrite-graphene composite materials prepared by the aid of the method are 10 nm, the manganese ferrite nano-particles are excellently dispersed on graphene, and accordingly the manganese ferrite-graphene composite materials prepared by the aid of the method are excellent in wave absorbing property.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorbing materials, in particular to a preparation method of manganese ferrite-graphene composite material. Background technique [0002] Manganese ferrite nanomaterials are typical ferromagnetic materials with large coercive force and saturation magnetic susceptibility, and are currently mainstream electromagnetic wave absorbing materials. However, manganese ferrite nanoparticles are easily agglomerated when exposed to air, resulting in poor electromagnetic properties. [0003] Graphene has excellent flexibility, corrosion resistance, electrical conductivity, light weight and large specific surface area, so it is often used as a substrate to carry other active materials. Graphene nanosheets have good dispersion, can effectively prevent nanoparticles from agglomerating, and can provide high-efficiency unidirectional conductivity. Therefore, manganese ferrite nanoparticles and graphene are mad...

Claims

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Application Information

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IPC IPC(8): C01G49/00H05K9/00B82Y30/00
CPCC01G49/0081B82Y30/00C01P2002/01C01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2004/80H05K9/0081
Inventor 马淑兰马腾袁萌伟孙根班
Owner BEIJING NORMAL UNIVERSITY
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