A kind of high saturation magnetization nano ferroferric oxide/graphene composite material with electromagnetic shielding function and preparation method thereof

A technology of ferroferric oxide and composite materials, which is applied in the field of high saturation magnetization nanometer ferroferric oxide/graphene composite materials and its preparation, can solve the problem of unfavorable broadband electromagnetic shielding materials, narrow electromagnetic shielding peak frequency range, material Problems such as particle size dispersion, to achieve good electromagnetic shielding performance, narrow particle size distribution, and stable particle size

Active Publication Date: 2018-07-17
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent No. 201510355776.X provides a ferric chloride, sodium acetate, graphene oxide as raw materials, ethylene glycol as the medium, and the application of solvothermal method to prepare ferric oxide graphene nanocomposites. Its particle size is 200nm, and the dispersion degree of distribution is large, the saturation magnetization is less than 50emu / g, and the frequency range covered by the electromagnetic shielding peak is very narrow, which is not conducive to use as a broadband electromagnetic shielding material
[0005] To sum up, at present, most of them adopt the solvothermal method, using graphene oxide and trivalent soluble iron salt as the main raw materials to prepare graphene ferric oxide nanocomposites. The particle size of the prepared material is dispersed, and the controllability Not good, and lower saturation magnetization
It can be seen that there is no effective method for preparing nano-ferric oxide / graphene composites with uniform particle size, high saturation magnetization, and good electromagnetic shielding function in a wide frequency range.

Method used

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  • A kind of high saturation magnetization nano ferroferric oxide/graphene composite material with electromagnetic shielding function and preparation method thereof
  • A kind of high saturation magnetization nano ferroferric oxide/graphene composite material with electromagnetic shielding function and preparation method thereof
  • A kind of high saturation magnetization nano ferroferric oxide/graphene composite material with electromagnetic shielding function and preparation method thereof

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preparation example Construction

[0037] A kind of preparation method of nano ferroferric oxide / graphene composite material: comprise the following steps:

[0038] 1) Dissolve ferric salt, ferrous salt and urea in water to obtain mixed solution 1;

[0039] 2) Add reduced graphene oxide into water, ultrasonically disperse and stir to obtain a uniformly dispersed graphene suspension 2;

[0040] 3) Mix the above mixed solution 1 and suspension 2 evenly to obtain mixed solution 3, react mixed solution 3 at 120~180°C for 3~5h,

[0041] 4) Cool the product after the reaction in the previous step, wash it with ethanol solution, and dry it to a constant weight to obtain a nano-ferric oxide / reduced graphene oxide composite material.

[0042] Preferably, the molar ratio of ferric iron to ferrous iron in step 1) is 1-3:1.

[0043] Preferably, the mass ratio of urea to total iron salts in step 1) is 0.1-0.4:1.

[0044]Preferably, the concentration of iron ions in the mixed solution 1 in step 1) is 1-2.5 mmol / mL.

[00...

Embodiment 1

[0063] A method for preparing a nano-ferric oxide / graphene composite material with high saturation magnetization, comprising the steps of:

[0064] 1) Weigh 3g of ferrous chloride, 4.9g of ferric chloride and 2g of urea into a conical flask, add 30ml of deionized water, stir well, and obtain mixed solution 1.

[0065] 2) Weigh 0.1027g of reduced graphene oxide into a beaker, add 20ml of deionized water, ultrasonically disperse and vigorously stir for 0.5h at a stirring speed of 1500-1600rpm to obtain a uniformly dispersed graphene suspension 2.

[0066] 3) Mix solution 1 and suspension 2 evenly to obtain mixed solution 3.

[0067] 4) The mixed solution 3 was transferred to a hydrothermal reaction kettle, heated in an oven at 140° C. for 3 hours, the reaction kettle was taken out, and cooled to room temperature naturally. The product in the reaction kettle was taken out and washed by centrifugation with 50% ethanol solution for 2 to 3 times, and then dried in a vacuum oven at ...

Embodiment 2

[0069] A method for preparing a nano-ferric oxide / graphene composite material with high saturated chemical strength, comprising the steps of:

[0070] 1) Weigh 3g of ferrous chloride, 5.7g of ferric chloride and 2g of urea into a conical flask, add 30ml of deionized water, stir well, and obtain mixed solution 1.

[0071] 2) Weigh 0.1027g of reduced graphene oxide into a beaker, add 20ml of deionized water, ultrasonically disperse and vigorously stir for 0.5h at a stirring speed of 1200rpm, to obtain a uniformly dispersed graphene suspension 2.

[0072] 3) Mix solution 1 and suspension 2 evenly to obtain mixed solution 3.

[0073] 4) The mixed solution 3 was transferred to a hydrothermal reaction kettle, heated in an oven at 140° C. for 3 hours, the reaction kettle was taken out, and cooled to room temperature naturally. The product in the reaction kettle was taken out and washed by centrifugation with 50% ethanol solution for 2 to 3 times, and then dried in a vacuum oven at 6...

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Abstract

The invention discloses a nano Fe3O4 / graphene composite material with high saturation magnetization and an electromagnetic shielding function as well as a preparation method of the composite material. According to the method, Fe3<+> and Fe2<+> salts are used as iron sources, in combination with urea, reduced graphene oxide and water, the composite material is prepared with a hydrothermal method. The prepared nano Fe3O4 / graphene composite material is evenly distributed nanoparticles of 40-50 nm, the crystal form is complete, the specific saturation magnetization is 75 emu / g or above, and the electromagnetic shielding effectiveness of the composite material can reach 26 dB or above within 2-18 GHz when the filling amount is 50%. The preparation technology is simple, raw materials are wide in source, water is taken as a medium, and the production requirement of green chemistry is met. The composite material is a multifunctional nanomaterial and has broad application prospect in fields of biomedical materials, electromagnetic shielding materials, electrode materials, catalytic materials, sewage treatment and the like.

Description

technical field [0001] The invention relates to a high saturation magnetization nano ferric oxide / graphene composite material with electromagnetic shielding function and a preparation method thereof, belonging to the technical field of nano magnetic functional materials. The high saturation magnetization nano-ferric oxide / graphene composite material with electromagnetic shielding function provided by the present invention can be widely used in the fields of biomedical materials, electromagnetic shielding materials, electrode materials, catalytic materials, sewage treatment and the like. Background technique [0002] Nano ferroferric oxide magnetic particles belong to the cubic crystal system, with large specific surface area, unique physical and chemical properties, and excellent magnetic characteristics such as superparamagnetic properties and high magnetic susceptibility. They are widely used in biomedicine, special coatings, catalysts, etc. field has been widely used. Du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00C01G49/08B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G49/08C09K3/00
Inventor 石光奚克里
Owner SOUTH CHINA NORMAL UNIVERSITY
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