A kind of graphene/chitosan composite material and preparation method thereof

A composite material and graphene technology, applied in the field of composite materials, can solve the problems of rough appearance of electrodeposited layer, uneven and smooth surface, low graphene content, etc., to achieve enhanced thermal stability and mechanical properties, simple equipment, and good biological properties. Compatibility effect

Inactive Publication Date: 2019-06-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But on the one hand, graphene oxide is directly used as raw material for deposition, and it needs to be reduced in the later stage, so the graphene content in the deposited composite material is not high; on the other hand, the electrodeposited layer with graphene is prepared by cathodic electrodeposition. During the deposition process, the cathode electrochemical reaction produces a large number of bubbles, resulting in a rough appearance of the graphene electrodeposited layer and an uneven and smooth surface, which is not conducive to its subsequent application

Method used

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  • A kind of graphene/chitosan composite material and preparation method thereof
  • A kind of graphene/chitosan composite material and preparation method thereof
  • A kind of graphene/chitosan composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] The graphene / chitosan composite material is prepared by anodic electrodeposition technology, and the steps are as follows:

[0029] 1) Preparation of graphene dispersion: Weigh 0.1g of graphite oxide, add it to a beaker filled with 40mL of 0.05M aqueous sodium hydroxide solution, and obtain a graphene oxide dispersion (mass concentration of 2.5mg / mL) through ultrasonic dispersion for 10 minutes ); Take 0.3g chitosan quaternary ammonium salt and join in the beaker that fills 100mL distilled water, through magnetic stirring 1 hour, obtain chitosan quaternary ammonium salt aqueous solution (mass concentration is 3mg / mL); Then the above-mentioned obtained The graphene oxide dispersion was added to the chitosan quaternary ammonium salt solution for mixing, stirred magnetically at room temperature for 1 hour to obtain a mixed solution, then adjusted the pH value of the mixed solution to 11 with 0.07M aqueous sodium hydroxide solution, and then mixed 0.4g Hydrazine hydrate was...

Embodiment 2

[0036] The graphene / chitosan composite material is prepared by anodic electrodeposition technology, and the steps are as follows:

[0037] 1) Preparation of graphene dispersion: Weigh 0.2g of graphite oxide, add it to a beaker filled with 80mL of 0.05M sodium hydroxide aqueous solution, and obtain a graphene oxide dispersion with a mass concentration of 2.5mg / mL after ultrasonic dispersion for 50 minutes Take by weighing 1.0g chitosan quaternary ammonium salt and join in the beaker that fills 200mL distilled water, through magnetic stirring 5 hours, obtain the chitosan quaternary ammonium salt aqueous solution that mass concentration is 5mg / mL; Then the above-mentioned graphite oxide obtained Add the ethylene dispersion to the chitosan quaternary ammonium salt solution for mixing, stir magnetically at room temperature for 5 hours to obtain a mixed solution, then adjust the pH value of the mixed solution to 10 with 0.05M aqueous sodium hydroxide solution, and then add 1.1g of hy...

Embodiment 3

[0044] The graphene / chitosan composite material is prepared by anodic electrodeposition technology, and the steps are as follows:

[0045] 1) Preparation of graphene dispersion: Weigh 0.2g of graphite oxide, add it to a beaker filled with 40mL of 0.05M aqueous sodium hydroxide solution, and obtain a graphene oxide dispersion with a mass concentration of 5mg / mL through ultrasonic dispersion for 30 minutes; Take by weighing 1.0g chitosan quaternary ammonium salt and join in the beaker that fills 200mL distilled water, through magnetic stirring 3 hours, obtain the chitosan quaternary ammonium salt aqueous solution that mass concentration is 5mg / mL; Then the graphene oxide obtained above Add the dispersion to the chitosan quaternary ammonium salt solution for mixing, stir magnetically at room temperature for 2 hours to obtain a mixed solution, then adjust the pH value of the mixed solution to 9 with 0.03M aqueous sodium hydroxide solution, and then drop 0.8g hydrazine hydrate Add ...

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Abstract

The invention relates to a graphene / chitosan composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, adding an oxidized graphene dispersion liquid into a chitosan quaternary ammonium salt aqueous solution, adjusting the pH value to be 9 to 11, adopting hydrazine hydrate to perform reduction, and then dispreading graphene into water, so as to obtain modified graphene dispersion liquid; secondly, adding chitosan into acetic acid aqueous solution, so as to obtain chitosan solution; thirdly, adding the chitosan solution into the graphene dispersion liquid and uniformly stirring, so as to obtain graphene / chitosan electrolytic deposition liquid; fourthly, performing ultrasonic dispersion on the graphene / chitosan electrolytic deposition liquid, so as to remove bubbles, and adopting an electrolytic deposition method, so as to obtain the graphene / chitosan composite material. The graphene / chitosan composite material is flat and smooth in appearance, does not have bubbles, is easily taken down from the surface of an electrode, and is beneficial to subsequent application of materials directly.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a graphene / chitosan composite material and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial composed of carbon atoms with only one atomic thickness. It has good stability. It is a new type of nanomaterial with thinner thickness, greater mechanical strength, and good electrical and thermal conductivity. , has attracted much attention in electronic components, solar cells, and sensors. Adding graphene as a nanofiller component to polymers can effectively improve the electrical, mechanical and thermal properties of polymers. However, since the surface of graphene is inert, and graphene will gather together due to the van der Waals force between its sheets, it is difficult to disperse in water and organic solvents, so it cannot be well compounded with the polymer matrix, greatly This limits the further resea...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08K9/04C08K3/04C25D9/02
CPCC08K3/04C08K9/08C25D9/02C08L5/08
Inventor 陈艳军刘明阳王艺峰章政郭传航薛武子
Owner WUHAN UNIV OF TECH
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