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Preparation method of reduction-oxidation graphene/ferroferric oxide composite wave-absorbing hydrogel having three-dimensional structure

A technology of ferroferric oxide and three-dimensional structure, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effect of reducing dielectric constant, light weight, and improving magnetic permeability

Inactive Publication Date: 2013-12-18
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite hydrogel of three-dimensional reduced graphene oxide and ferroferric oxide prepared at room temperature has not been reported yet.

Method used

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  • Preparation method of reduction-oxidation graphene/ferroferric oxide composite wave-absorbing hydrogel having three-dimensional structure
  • Preparation method of reduction-oxidation graphene/ferroferric oxide composite wave-absorbing hydrogel having three-dimensional structure
  • Preparation method of reduction-oxidation graphene/ferroferric oxide composite wave-absorbing hydrogel having three-dimensional structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation of graphene oxide

[0028] Graphene oxide was prepared by a modified Hummers method as the precursor of the composite absorbing hydrogel.

[0029] The specific preparation method is: take by weighing 3g of graphite, mix with 1.5g of sodium nitrate, measure 150mL of sulfuric acid and slowly add in the above solid, ice bath and slowly add 9.0g of potassium permanganate under magnetic stirring, this process Continue for about 2 hours; remove the ice bath, bathe in water at 35°C for about 5 days, slowly add 140mL of water, then add 350mL of water after 30 minutes, slowly add 20mL of 30% hydrogen peroxide, the solution gradually turns dark yellow; the above solution Centrifuge and wash with water for several times, take the lower layer and sonicate for 2 hours, then centrifuge at 8000 rpm to get the upper layer, dialyze for 15 days, and freeze-dry.

[0030] 2. Co-precipitation method to prepare ferric oxide nanoparticles

[0031] 2.6g Fe...

Embodiment 2

[0039] 1, the preparation of graphene oxide is the same as embodiment 1.

[0040] 2. The preparation of iron ferric oxide nanoparticles is the same as in Example 1.

[0041] 3. Preparation of graphene / ferric oxide composite absorbing material with three-dimensional structure

[0042] (1) Weigh 100 mg of graphene oxide, ultrasonically disperse it in 50 mL of water, and prepare a 2 mg / mL aqueous solution;

[0043] (2) Weigh 1.2 g of ascorbic acid, add to the above solution and fully dissolve;

[0044] (3) Weigh 150 mg of Fe3O4 nanoparticles and evenly disperse them in the above mixed solution;

[0045] (4) After the dispersion is uniform, the mixed solution is allowed to stand at room temperature for 7 days;

[0046] (5) The obtained hydrogel is frozen and then dried.

Embodiment 3

[0048] 1, the preparation of graphene oxide is the same as embodiment 1.

[0049] 2. The preparation of iron ferric oxide nanoparticles is the same as in Example 1.

[0050] 3. Preparation of graphene / ferric oxide composite absorbing material with three-dimensional structure

[0051] (1) Weigh 100 mg of graphene oxide, ultrasonically disperse it in 50 mL of water, and prepare a 2 mg / mL aqueous solution;

[0052] (2) Weigh 3.0 g of ascorbic acid, add to the above solution and fully dissolve;

[0053] (3) Weigh 300 mg of Fe3O4 nanoparticles and evenly disperse them in the above mixed solution;

[0054] (4) After the dispersion is uniform, the mixed solution is allowed to stand at room temperature for 5 days;

[0055] (5) The obtained hydrogel is frozen and then dried.

[0056]

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Abstract

The invention discloses a preparation method of a reduction-oxidation graphene / ferroferric oxide composite wave-absorbing hydrogel having a three-dimensional structure. The composite wave-absorbing hydrogel has a micron-sized porous structure, and ferroferric oxide nano particles are uniformly distributed on a graphene nano sheet in a three-dimensional network. The electromagnetic microwave absorption property of the composite hydrogel changes with the content of the ferroferric oxide; and the composite hydrogel is light in weight and satisfies the characteristics of a microwave absorption material such as light weight and high strength. The invention also discloses a preparation method of the composite hydrogel, which comprises the following step: by using ascorbic acid as reducer, standing at normal temperature. The preparation method is convenient, quick and low in cost, and can realize large-scale production.

Description

technical field [0001] The invention relates to the field of electromagnetic microwave absorbing materials, in particular to a method for preparing a reduced graphene oxide / ferric oxide composite wave-absorbing hydrogel with a three-dimensional structure. Background technique [0002] Stealth materials are also called wave-absorbing materials, whose function is to convert external electromagnetic wave materials into heat energy, reduce the intensity of reflected waves, and achieve the effect of stealth. Electromagnetic absorbing materials have attracted widespread attention due to their wide application in the fields of radar, aerospace, microwave communication, electronic countermeasures, and electronically compatible absorption and shielding. [0003] Ferroferric oxide is a typical magnetic material, which has potential application value in supercapacitors, lithium-ion batteries, catalysts, magnetic resonance and electromagnetic absorbing materials. [0004] Carbon-ba...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 张惠沈玉华谢安建王翠平
Owner ANHUI UNIVERSITY
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