Preparation method of grapheme and ferriferrous oxide composite nanometer material

A composite nanomaterial, ferric oxide technology, applied in the direction of graphene, iron oxide/iron hydroxide, nanotechnology for materials and surface science, etc., can solve the problem of poor repeatability of magnetic materials, limited application, and limited use and other problems, to achieve the effects of good stability, high specific surface area and low process cost

Inactive Publication Date: 2013-09-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, although traditional RAM, such as ferrite, has good microwave absorption performance, its use is limited due to its large specificity.
At the same time, the magnetic saturation strength of the ferroferric oxide composite material obtained by the traditional sol-gel method is not stable enough. Although the preparation method is relatively simple and easy to obtain, the performance of the final magnetic material is poor in repeatability, which further limits the use of such materials. application
As can be seen from the existing published patent literature, there are few reports on ferromagnetic ferroferric oxide composite materials with nanoscale dispersion. Therefore, the present invention hopes to provide a stable process for preparing ferromagnetic graphene and ferroferric oxide composites. Nanomaterial method (invention patents: CN103007886A, CN102604009A, CN102674476A, CN102489284A, CN102826545A)

Method used

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  • Preparation method of grapheme and ferriferrous oxide composite nanometer material
  • Preparation method of grapheme and ferriferrous oxide composite nanometer material
  • Preparation method of grapheme and ferriferrous oxide composite nanometer material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Prepare graphene oxide. The preparation process of described graphene oxide comprises the following steps:

[0029] Step 1-1: Raw material preparation. With flake graphite powder, concentrated sulfuric acid, concentrated phosphoric acid and potassium permanganate as the main reaction raw materials for preparing graphene oxide, the ratio of each raw material component is controlled to be: flake graphite powder: concentrated sulfuric acid: concentrated phosphoric acid: potassium permanganate=1g :120mL:15mL:6g.

[0030] Step 1-2: Oxidative exfoliation of flake graphite powder. At room temperature, add the concentrated sulfuric acid and concentrated phosphoric acid prepared in step 1 into a three-necked flask with a condenser and mix them until the temperature of the mixed acid returns to room temperature; then slowly add the flake graphite powder prepared in step 1, and stir for 2 hours at room temperature; Slowly add the potassium permanganate prepared in step ...

Embodiment 2

[0035] Step 1: Prepare graphene oxide. The preparation of graphene oxide is the same as in Example 1.

[0036] Step 2: using a solvothermal method to synthesize graphene and ferroferric oxide composite nanomaterials in one step. The specific process is: Dissolve 5g 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 the graphene oxide prepared in step 1 and stir ultrasonically. Until the graphene is completely dispersed, the whole system is a uniform black solution; according to FeCl 3 ·6H 2 The ratio of O to graphene oxide is 1g:6.7mg, add ferric chloride hexahydrate, continue to stir for half an hour, add 9g of sodium acetate, continue ultrasonic stirring for 2 hours, and then transfer the mother liquor to the stainless steel high-pressure crystal glass lined with polytetrafluoroethylene. Crystallization at 200°C for 24 ho...

Embodiment 3

[0038] Step 1: Prepare graphene oxide. The preparation of graphene oxide is the same as in Example 1.

[0039] Step 2: using a solvothermal method to synthesize graphene and ferroferric oxide composite nanomaterials in one step. The specific process is: Dissolve 5g 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 the graphene oxide prepared in step 1 and stir ultrasonically. Until the graphene is completely dispersed, the whole system is a uniform black solution; according to FeCl 3 ·6H 2 The ratio of O to graphene oxide is 1g:10.2mg, add ferric chloride hexahydrate, continue to stir for half an hour, add 9g of sodium acetate, continue ultrasonic stirring for 2 hours, and then transfer the mother liquor to a stainless steel high-pressure crystal glass lined with polytetrafluoroethylene. Crystallization at 200°C for 24 hou...

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Abstract

A preparation method of a grapheme and ferriferrous oxide composite nanometer material belongs to the technical field of functional materials. The preparation method comprises the following steps: at first, oxidized grapheme is prepared by an improved chemical method; and then oxidized grapheme and ferric ions are adopted as raw materials, and are compounded through adopting a solvothermal technology to carry out one-step in-situ reduction to obtain the grapheme and ferriferrous oxide composite nanometer material. The preparation method solves the problems in the prior art that the interface binding force of grapheme and a magnetic material is insufficient, the appearances, the sizes and the magnetism of magnetic material particles are uncontrollable, and the magnetic material particles cannot be dispersed in water; the prepared composite nanometer material shows a microspheric appearance, has a loose surface and is high in specific surface area; through the change of the ratio of grapheme to the ferric ions, final magnetic property and electrical property of the composite material can be adjusted; and the controllable growth of the grapheme and ferriferrous oxide composite material is realized. The prepared grapheme and ferriferrous oxide nanometer microsheric material with magnetic and electric properties can be used in fields such as biological medicine, energy, invisibility and electronic materials.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a preparation method of graphene and ferroferric oxide composite nanomaterials. Background technique [0002] Ferrite is both a magnetic medium and a dielectric. It has dual functions of magnetic absorption and electric absorption. It is widely used as functional materials such as soft magnetism, hard magnetism, moment magnetism, magnetism and piezoelectric magnetism, especially in wave-absorbing materials. It has broad application prospects. Compared with other absorbing materials, it has the characteristics of small size, good absorbing effect and low cost. It can not only be widely used in military equipment and facilities such as aircraft, tanks, missiles and radars, but also in civilian fields. Many applications, such as microwave anechoic chamber materials, microwave attenuator components, etc. In today's highly developed information communication and network te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01G49/08B82Y30/00C01B32/182
Inventor 薛卫东赵睿杜霞杨光
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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