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Method for preparing graphene/ferrite composite nanometer microspheres having high magnetic-electric performances

A nano-microsphere and graphene technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problems of poor chemical stability, inability to be widely used, and non-uniform particle size, and achieve good solubility, excellent electromagnetic loss performance, The effect of simple synthesis method

Inactive Publication Date: 2015-09-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of the earliest metals and metal oxides could not be widely used due to problems such as poor chemical stability, non-uniform particle size, and serious agglomeration.

Method used

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  • Method for preparing graphene/ferrite composite nanometer microspheres having high magnetic-electric performances
  • Method for preparing graphene/ferrite composite nanometer microspheres having high magnetic-electric performances
  • Method for preparing graphene/ferrite composite nanometer microspheres having high magnetic-electric performances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Take flake graphite powder, concentrated sulfuric acid, concentrated phosphoric acid, potassium permanganate, deionized water, hydrogen peroxide, dilute hydrochloric acid; wherein the ratio of flake graphite powder to concentrated sulfuric acid is 1g: 120mL; the ratio of flake graphite powder to concentrated phosphoric acid It is 1g: 15mL; the ratio of graphite powder to potassium permanganate is 1g: 6g; the concentration of hydrogen peroxide is 30%;

[0032] (2) In a water bath at room temperature, add concentrated sulfuric acid and phosphoric acid mixed acid into a 500mL three-necked bottle with a condenser, mechanically stir until the temperature of the mixed acid returns to room temperature, control the amount of flake graphite powder added, and complete the addition in three times within half an hour. Stir mechanically for 2 hours, slowly add potassium permanganate in portions, at this time the temperature of the system rises slowly, control the amount of potass...

Embodiment 2

[0038] The preparation of graphene oxide is with embodiment 1;

[0039] Dissolve 1g of polyethylene glycol 20000 in 100ml of ethylene glycol solution with mechanical stirring at a water bath temperature not exceeding 80°C. After the system becomes a uniform and transparent solution, add graphene oxide and stir ultrasonically until the graphene is completely dissolved. Uniform black solution, ready for use; press FeCl 3 The ratio to graphene oxide is 1g: 18.5mg, add ferric chloride hexahydrate, add manganese acetate according to the molar ratio of iron ion to manganese ion 2:1; continue stirring for half an hour, add 6g of sodium acetate solid, continue ultrasonic stirring After 2 hours, the mother liquor was transferred to a stainless steel polytetrafluoro high-pressure crystallization kettle, and crystallized at 180°C for 24h. The obtained black solid was separated by a magnet, washed several times with deionized water and ethanol, and dried overnight in a vacuum oven at 80°...

Embodiment 3

[0042] The preparation of graphene oxide is with embodiment 1;

[0043] Dissolve 1g of polyethylene glycol 20000 in 100ml of ethylene glycol solution with mechanical stirring at a water bath temperature not exceeding 80°C. After the system becomes a uniform and transparent solution, add graphene oxide and stir ultrasonically until the graphene is completely dissolved. Uniform black solution, ready for use; press FeCl 3 The ratio to graphene oxide is 1g: 22.2mg, add ferric chloride hexahydrate, add manganese acetate according to the molar ratio of iron ion to manganese ion 2:1; continue stirring for half an hour, add 6g of sodium acetate solid, continue ultrasonic stirring After 2 hours, the mother liquor was transferred to a stainless steel PTFE high-pressure crystallization kettle, and crystallized at 180°C for 24 hours; the black solid obtained by separating with a magnet was washed with deionized water and ethanol several times, and dried overnight in a vacuum oven at 80°C ...

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Abstract

The invention belongs to the field of novel material preparation and provides a method for preparing graphene / ferrite composite nanometer microspheres having high magnetic-electric performances. Ferrites are manganous ferrite and nickel ferrite. According to the method, first graphene oxide is prepared, and then graphene / manganous ferrite or graphene / nickel ferrite composite nanometer microspheres are synthesized in one step through a hydrothermal method (a solvothermal method). The synthesizing method is simple. The obtained graphene / manganous ferrite or graphene / nickel ferrite composite nanometer microspheres are high in specific surface area and have high magnetism; and by controlling the ratio of graphene oxide to manganous ferrite or the ratio of graphene oxide to nickel ferrite, it is guaranteed that the composite nanometer microspheres can achieve very good wave-absorbing properties. Prepared graphene / manganous ferrite and graphene / nickel ferrite nanocomposite materials not only have excellent electromagnetic loss performances, but also can serve as a light and high-strength wave-absorbing material to be applied to the fields of sewage treatment, energy, stealth and electronics.

Description

technical field [0001] The invention belongs to the field of new material preparation, and relates to a method for preparing a graphene / ferrite composite material, in particular to a method for preparing a graphene / ferrite composite nano-microsphere with strong magnetoelectric properties, wherein the ferrite is ferric acid Manganese, nickel ferrite. Background technique [0002] Spinel-type ferrite is a double-complex dielectric material, which has double absorption functions of magnetic absorption and electric absorption. In addition, it also has a high u r Value and low preparation cost, now ferrite is a kind of microwave absorber that is widely concerned by people. Compared with other absorbing materials, ferrite materials have the advantages of high absorption efficiency, thin coating, and wide frequency band. They can not only be widely used in military equipment and facilities such as aircraft, tanks, missiles, and radars, but also in civilian fields. Many applicatio...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 赵睿邱瑶薛卫东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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