Magnetic graphene-based airgel material with magnetic field and pressure sensing effect and preparation method thereof

A magnetic graphene and aerogel technology, applied in the direction of the size/direction of the magnetic field, graphene, and the measurement of the change force of the magnetic property of the material caused by the applied stress, can solve the problem of inability to achieve fast response and high sensitivity , The magnetic field detection range is small, the resistance value change is small, etc., to achieve good magnetic field sensing performance, good electromagnetic performance and mechanical performance, and high sensitivity.

Active Publication Date: 2021-05-07
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional magnetic field sensor has the problem of small change in resistance value, resulting in a small magnetic field detection range, and at the same time, it cannot achieve fast response and high sensitivity in weak magnetic field detection.

Method used

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  • Magnetic graphene-based airgel material with magnetic field and pressure sensing effect and preparation method thereof
  • Magnetic graphene-based airgel material with magnetic field and pressure sensing effect and preparation method thereof
  • Magnetic graphene-based airgel material with magnetic field and pressure sensing effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a method for preparing a magnetic graphene-based airgel material, and the specific preparation process is as follows:

[0055] 1) Preparation of reduced graphene oxide solution: use natural graphite powder, concentrated sulfuric acid, potassium persulfate, phosphorus pentoxide, and potassium permanganate as raw materials to prepare graphene oxide through the improved Hummers method, and uniformly disperse it in deionized water A graphene oxide aqueous solution is obtained. Put the graphene oxide aqueous solution in a 500mL beaker, add ethylenediamine solution, heat it in a water bath to 60-90°C, reduce it under stirring for 1-6 hours, take it out and dialyze it with deionized water for 12-24 hours to obtain reduced graphene oxide solution.

[0056] 2) Preparation of nanofiber suspension: thermoplastic PVA-co-PE masterbatch and cellulose acetate butyrate (CAB) powder are mixed according to a certain quality and then melted and extruded to obtain...

Embodiment 2

[0061] This embodiment provides a method for preparing a magnetic graphene-based airgel material, and the specific preparation process is as follows:

[0062] 1) Preparation of reduced graphene oxide solution: use natural graphite powder, concentrated sulfuric acid, potassium persulfate, phosphorus pentoxide, and potassium permanganate as raw materials to prepare graphene oxide through the improved Hummers method, and uniformly disperse it in deionized water A graphene oxide aqueous solution is obtained. Put the graphene oxide aqueous solution in a 500mL beaker, add ethylenediamine solution, heat it in a water bath to 60-90°C, reduce it under stirring for 1-6 hours, take it out and dialyze it with deionized water for 12-24 hours to obtain reduced graphene oxide solution.

[0063] 2) Preparation of nanofiber suspension: thermoplastic PVA-co-PE masterbatch and cellulose acetate butyrate (CAB) powder are mixed according to a certain quality and then melted and extruded to obtain...

Embodiment 3

[0068] This embodiment provides a method for preparing a magnetic graphene-based airgel material, and the specific preparation process is as follows:

[0069] 1) Preparation of reduced graphene oxide solution: use natural graphite powder, concentrated sulfuric acid, potassium persulfate, phosphorus pentoxide, and potassium permanganate as raw materials to prepare graphene oxide through the improved Hummers method, and uniformly disperse it in deionized water A graphene oxide aqueous solution is obtained. Put the graphene oxide aqueous solution in a 500mL beaker, add ethylenediamine solution, heat it in a water bath to 60-90°C, reduce it under stirring for 1-6 hours, take it out and dialyze it with deionized water for 12-24 hours to obtain reduced graphene oxide solution.

[0070] 2) Preparation of nanofiber suspension: thermoplastic PVA-co-PE masterbatch and cellulose acetate butyrate (CAB) powder are mixed according to a certain quality and then melted and extruded to obtain...

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Abstract

The invention discloses a magnetic graphene-based airgel material with the same sensing effect of magnetic field and pressure and a preparation method thereof. The preparation method comprises growing magnetic nickel metal particles on the surface of the prepared polymer nanofiber, and then reducing The graphene oxide solution is mixed and continues to obtain a uniformly dispersed mixed solution through ultrasonic dispersion technology, and then undergoes directional freezing treatment and freeze-drying treatment to obtain magnetic graphene-based airgel. The introduction of metal nickel not only improves the conductivity of the magnetic graphene-based aerogel, but also endows it with a good magnetic field response effect, realizing rapid response and monitoring of changes in the magnetic field. It also has a good pressure sensing effect. Therefore, the graphene-based airgel has the function of simultaneously sensing magnetic field and pressure, and has broad application prospects in the fields of smart wearable devices, electromagnetic shielding, and wave absorption and noise reduction.

Description

technical field [0001] The invention relates to a graphene-based airgel material, which belongs to the technical field of new materials, in particular to a magnetic graphene-based airgel material with magnetic field and pressure sensing effects and a preparation method thereof. Background technique [0002] Graphene is a new favorite in the material world, and its various forms are considered to have potential application value in various fields. The pure graphene-based airgel prepared by the ice template method has extremely low density, large porosity and high specific surface area. However, due to its extremely loose structure and the destruction of a large number of hydrogen bonds caused by the sublimation process of freeze-dried ice crystals, there is a lack of sufficient cross-linking and binding force between graphene sheets. Therefore, when compressed or deformed, the graphene sheets will be seriously stacked under the dual effects of strong π-π stacking and van der...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C04B111/50
CPCC04B30/02C04B2111/00422C04B2111/00844C04B2111/503G01L1/12G01R33/02C04B14/028C04B16/06C04B14/34
Inventor 刘琼珍王栋贺晓伟陈佳慧孙灯明刘轲王雯雯李沐芳王跃丹鲁振坦蒋海青
Owner WUHAN TEXTILE UNIV
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