Graphene-loaded nickel magnetic composite material preparation method

A magnetic composite material and graphene technology, applied in the direction of graphene, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of strong acid affecting the content of metal nickel, long preparation cycle, and low saturation magnetization value of materials, etc., to achieve high Economic value, reduced electromagnetic radiation intensity, high saturation magnetization effect

Inactive Publication Date: 2019-01-01
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

At present, the research work on the modification of inorganic functionalized graphene at home and abroad uses a large number of in-situ co-reduction methods, and it is still a difficult problem to apply the electroless plating method to graphene modification and control the surface particle size.
Therefore, there is an urgent need for a preparation method of graphene-supported nickel magnetic composite materials, which can improve the problems of long preparation period, strong acid affecting the content of metallic nickel and the low saturation magnetization value of the obtained material in the existing methods.

Method used

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  • Graphene-loaded nickel magnetic composite material preparation method
  • Graphene-loaded nickel magnetic composite material preparation method
  • Graphene-loaded nickel magnetic composite material preparation method

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specific Embodiment approach

[0025] A preparation method of graphene loaded nickel magnetic composite material, comprising the following steps:

[0026] (1) Select a single-layer or few-layer graphene oxide aqueous solution; the number of layers of graphene has a significant impact on its performance, select a single-layer or few-layer graphene oxide (less than 5 layers) as the carrier of the composite absorbent, and form after the reaction Few-layer graphene, taking advantage of its ultra-high electron mobility and high specific surface area, makes the graphene-loaded nano-nickel magnetic composite material have better conductivity and electromagnetic shielding effect;

[0027] (2) Pre-freeze the graphene oxide aqueous solution first, the pre-freezing temperature is -50~-10°C, and the pre-freezing time>1h, until the graphene oxide solution is completely frozen; Under vacuum conditions, the water in it is directly sublimated from ice to achieve the purpose of drying;

[0028] (3) Then put the frozen grap...

Embodiment 1

[0039] A preparation method of graphene loaded nickel magnetic composite material, comprising the following steps:

[0040] (1) choose monolayer graphene oxide aqueous solution;

[0041] (2) Pre-freezing the graphene oxide aqueous solution first, the pre-freezing temperature is -50~-10°C, and the pre-freezing time>1h, until the graphene oxide solution is completely frozen;

[0042] (3) Then put the graphene oxide solution after freezing into a vacuum drying box, vacuumize and carry out vacuum freeze-drying, the freeze-drying temperature is -45~-25 ℃, and the drying time is 5~20h, so that the graphene oxide solution Water directly sublimates from ice to gas;

[0043] (4) Evenly disperse the graphene oxide after vacuum freeze-drying in ethylene glycol, then add nickel acetate and hydrazine hydrate in sequence, and at the same time add sodium hydroxide solution to adjust the pH to 13, and ultrasonicate for 5-60 minutes; the amount of graphene oxide The dosage is 2mg / mL, the dosag...

Embodiment 2

[0047] A preparation method of graphene loaded nickel magnetic composite material, comprising the following steps:

[0048] (1) select the few-layer graphene oxide aqueous solution;

[0049] (2) Pre-freezing the graphene oxide aqueous solution first, the pre-freezing temperature is -50~-10°C, and the pre-freezing time>1h, until the graphene oxide solution is completely frozen;

[0050] (3) Then put the graphene oxide solution after freezing into a vacuum drying box, vacuumize and carry out vacuum freeze-drying, the freeze-drying temperature is -45~-25 ℃, and the drying time is 5~20h, so that the graphene oxide solution Water directly sublimates from ice to gas;

[0051] (4) Evenly disperse the graphene oxide after vacuum freeze-drying in ethylene glycol, then add nickel acetate and hydrazine hydrate in sequence, and at the same time add sodium hydroxide solution to adjust the pH to 13, and ultrasonicate for 5-60 minutes; the amount of graphene oxide The dosage is 2mg / mL, the...

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Abstract

The invention discloses a graphene-loaded nickel magnetic composite material preparation method which comprises the following steps: selecting a single-layer or few-layer oxidized graphene water solution to pre-freeze the oxidized graphene water solution until the oxidized graphene is completely frozen; performing vacuum freeze drying on the frozen oxidized graphene water solution to make moisturein the solution sublimate into air from ice; evenly dispersing the vacuum-freeze-dried oxidized graphene into ethylene glycol, sequentially adding nickel acetate and hydrazine hydrate, simultaneouslyadding a sodium hydroxide solution to adjust a PH to 13, then pouring an ultrasonically-treated mixed solution into a microwave high pressure reaction kettle, utilizing the hydrazine hydrate as a reducing agent and performing thermal insulation under the microwave condition; utilizing a suction filtration method for wash the reacted solution to obtain precipitate and washing and drying to preparea graphene-loaded nickel magnetic composite material. The graphene-loaded nickel magnetic composite material prepared by the method disclosed by the invention has the characteristics of small density, large coercive force, high saturation magnetization and large magnetic area.

Description

technical field [0001] The invention relates to the field of special functional materials, in particular to a method for preparing a graphene-supported nickel magnetic composite material. Background technique [0002] Electromagnetic shielding materials can reflect, absorb, and attenuate incident electromagnetic waves, and have the function of converting electromagnetic wave energy into heat energy and dissipating it or making electromagnetic waves disappear due to interference. It can block the transmission of electromagnetic waves and protect sensitive equipment from external electromagnetic interference, or Shielding the electromagnetic wave emission source reduces the diffusion of its electromagnetic wave. At present, electromagnetic shielding materials have disadvantages such as narrow absorption frequency band and high density. Therefore, the development of electromagnetic shielding materials with wide shielding frequency band and low density has become a research hots...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C01B32/184
CPCB01J20/20B01J20/28009C01B32/184
Inventor 苏孟兴刘奇王晶晶
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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