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Preparation method and application of graphene/cobalt-nickel-manganese ferrite nano-composite material

A nano-composite material, cobalt-nickel-manganese technology, applied in the field of microwave-absorbing materials, can solve problems such as harmful reaction solvents, long reaction time, and complicated process flow

Active Publication Date: 2018-12-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the existing technology, graphene / magnetic metal oxide composite materials cannot have the characteristics of impedance matching and loss characteristics at the same time, and the traditional preparation methods have problems such as complicated process flow, long reaction time, and harmful reaction solvents.

Method used

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  • Preparation method and application of graphene/cobalt-nickel-manganese ferrite nano-composite material
  • Preparation method and application of graphene/cobalt-nickel-manganese ferrite nano-composite material
  • Preparation method and application of graphene/cobalt-nickel-manganese ferrite nano-composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Step 1: Prepare graphene oxide by Hummers method. Specifically include the following stages: (1) low temperature reaction stage: 10g natural graphite powder and 5g sodium nitrate are added in 230mL concentrated sulfuric acid (ice-water bath), after stirring for a certain period of time, slowly add 30g potassium permanganate, during the addition process, Keep the reaction temperature not exceeding 20°C, and bathe in ice water for a certain period of time. (2) Medium-temperature reaction stage: remove the ice bath, raise the temperature of the water bath to 35° C., and stir for a certain period of time. During this process, as the reaction proceeded, the foam slowly disappeared, and only a small amount of gas was produced in the mixture, which was grayish brown. (3) High-temperature reaction stage: Slowly add 460mL of distilled water into the mixture, strong bubbles will be generated, the temperature will rise to 95°C, and the solution will turn brown. Water bath at thi...

Embodiment 2

[0079] Step 1: Same as Example 1.

[0080] Step 2: Add 0.1 g of graphene oxide into 80 mL of ethylene glycol solution, and then ultrasonically disperse for 1 h.

[0081] Step 3: Add 89.6mg ferric chloride, 11.8mg cobalt chloride, 21.7mg nickel chloride hexahydrate, 18.0mg manganese chloride tetrahydrate into 20mL ethylene glycol solution, in which iron salt, cobalt salt, nickel salt, manganese The ratio of the sum of the salt mass to the graphene oxide mass is 1.4:1, and ultrasonically dispersed for 1 h.

[0082] Step 4: Add the homogeneous solution obtained in step 3 dropwise to the solution obtained in step 2, and then ultrasonically disperse for 1 h. Then the mixed solution was magnetically stirred for 4 h.

[0083] Step 5: Add ammonia water to adjust the pH of the mixed solution to 11. After stirring for 1.5 h, add 1.5 mL of hydrazine hydrate solution.

[0084] Step 6: Pour the above mixed solution into a polytetrafluoroethylene reaction tank, and carry out microwave sy...

Embodiment 3

[0088] Step 1: Same as Example 1.

[0089] Step 2: Add 0.1 g of graphene oxide into 80 mL of ethylene glycol solution, and then ultrasonically disperse for 1 h.

[0090] Step 3: Add 116.1mg ferric chloride, 15.2mg cobalt chloride, 28.1mg nickel chloride hexahydrate, 23.3mg manganese chloride tetrahydrate into 20mL ethylene glycol solution, in which iron salt, cobalt salt, nickel salt, manganese The ratio of the sum of the salt mass to the graphene oxide mass is 1.8:1, and the ultrasonic dispersion is 0.5h.

[0091] Step 4: Add the homogeneous solution obtained in step 3 dropwise to the solution obtained in step 2, and then ultrasonically disperse for 0.5 h. Then the mixed solution was magnetically stirred for 4 h.

[0092] Step 5: Add ammonia water to adjust the pH of the mixed solution to 10. After stirring for 1 h, add 1 mL of hydrazine hydrate solution.

[0093] Step 6: Pour the above mixed solution into a polytetrafluoroethylene reaction tank, and carry out microwave sy...

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Abstract

The invention discloses a preparation method and application of a graphene / cobalt-nickel-manganese ferrite nano-composite material. The preparation method comprises: adding a solution containing an iron source, a cobalt source, a nickel source and a manganese source into a dispersion containing graphene oxide drop by drop to obtain a mixed solution, adjusting pH of the mixed solution to greater than or equal to 8, adding a reducing agent into the mixed solution to obtain a precursor solution, transferring the precursor solution into a reactor, and carrying out microwave synthesis to obtain thegraphene / cobalt-nickel-manganese ferrite nano-composite material. The graphene / cobalt-nickel-manganese ferrite nano-composite material is composed of layered graphene and spherical cobalt-nickel-manganese ferrite nanoparticles. The spherical cobalt-nickel-manganese ferrite nanoparticles are uniformly dispersed on the layered graphene surface and between the layers. The graphene / cobalt-nickel-manganese ferrite nano-composite material has the characteristics of strong absorption intensity, effective absorption frequency bandwidth, thin thickness and light weight.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a preparation method and application of a graphene / cobalt-nickel-manganese ferrite nanocomposite material. Background technique [0002] In recent years, with the rapid development of the electronics and communication industries, electromagnetic pollution and electromagnetic interference frequently flood the daily living space, which has seriously affected our health and daily life; on the other hand, from the perspective of air strike and strategic defense, stealth Aircraft has received unprecedented attention from all military powers. Therefore, there is an increasing demand for electromagnetic wave absorbing materials in the GHz range, both in military and civilian applications. From the perspective of application, especially in the military field, the demand for absorbing stealth materials is becoming increasingly stringent, and absorbing materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 彭志伟李光辉朱忠平彭健辉姜涛张元波饶明军李志忠叶青唐慧敏叶雷王连成郭宇峰杨永斌李骞徐斌
Owner CENT SOUTH UNIV
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