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Method for efficiently preparing graphene nanosheet material dispersed in natural polysaccharides

A graphene nanosheet, natural polysaccharide technology, applied in the field of nanomaterials, can solve the problems of structural defects, complex preparation process, incomplete reduction method, etc., and achieve the effect of improving peeling efficiency and low cost

Active Publication Date: 2017-09-15
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, the industrial production of graphene still faces the problem of how to prepare graphene with the desired structure at low cost and on a large scale.
The chemical reduction method of graphene oxide (GO) is currently the most widely used method for preparing graphene nanosheets, but its preparation process has problems of complexity, small scale, and heavy metal pollution. In addition, the graphene nanosheets obtained by reducing graphene There will be certain defects in the structure due to the incomplete reduction method

Method used

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  • Method for efficiently preparing graphene nanosheet material dispersed in natural polysaccharides
  • Method for efficiently preparing graphene nanosheet material dispersed in natural polysaccharides
  • Method for efficiently preparing graphene nanosheet material dispersed in natural polysaccharides

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Embodiment 1

[0032] A preparation method for high-efficiency preparation of graphene nanosheet materials dispersed in natural polysaccharides, the method comprising the following steps:

[0033] Microcrystalline cellulose derived from natural herbal cellulose and solid graphite are mixed at a weight ratio of 100:1, 50:1, and 20:1 respectively, and the mixture is added to a grinder for mechanical grinding in a pure oxygen atmosphere at a grinding speed of 300r .p.m, time 12h, obtained the thickness of 0.33nm-9nm single-layer or multi-layer graphene nanosheet material dispersed in natural herbal cellulose.

[0034] Wherein, the stripping efficiency of graphene nanosheets in the method of 100:1 weight ratio of microcrystalline cellulose derived from natural herbal cellulose and solid graphite is 80%.

Embodiment 2

[0040] With Example 1, the difference is that the ratio of pure oxygen atmosphere to oxygen and nitrogen is 6:1, 7:1, and 8:1 respectively, and the microcrystalline cellulose and solid graphite from natural herbal cellulose are by 20: 1 weight mixing, grinding rotation speed 300r.p.m, time 20h, obtained a single-layer or multilayer graphene nanosheet material with a thickness of 0.33nm-9nm dispersed in natural herbal cellulose.

[0041] Among them, in the methods of 6:1, 7:1, and 8:1 ratios of oxygen and nitrogen, the stripping efficiencies of graphene nanosheets were 40%, 50%, and 65%, respectively.

Embodiment 3

[0047] With embodiment 1, difference is that natural herbaceous cellulose is replaced by natural woody cellulose; Described natural woody cellulose and solid graphite are mixed by 20:1 weight; Grinding revolution number 500r.p.m in oxygen atmosphere, The time is 4h; a single-layer or multi-layer graphene nanosheet material with a thickness of 0.33nm-9nm dispersed in natural woody cellulose is obtained.

[0048] Among them, the exfoliation efficiency of graphene nanosheets is 70%.

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Abstract

The invention discloses a method for efficiently preparing a graphene nanosheet material dispersed in natural polysaccharides and a preparation method of a graphene nanosheet dispersion liquid. The graphene nanosheet material is dispersed into the natural polysaccharides and can be stably dispersed into water for a long time when the polysaccharides are removed. According to the method for efficiently preparing the graphene nanosheet material dispersed in the natural polysaccharides, the natural polysaccharides and solid graphene are mixed and directly mechanically ground in an oxygen atmosphere to obtain the monolayer or multilayer graphene nanosheet composite material dispersed in the natural polysaccharides with a thickness of 0.33 nm-0.9 nm. According to the prepared graphene nanosheet material, the natural polysaccharides serve as the dispersing agent and are dispersed around graphene nanosheets; in the oxygen atmosphere, the graphene nanosheets and the natural polysaccharides interact with each other on the interface by Van der Waals' force and CH-pi interaction and meanwhile react chemically with each other, so that the graphene stripping efficiency can be effectively improved from 10% to 80%.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a method for efficiently preparing graphene nanosheet materials dispersed in natural polysaccharides and a method for preparing graphene nanosheet dispersion liquids. Background technique [0002] Graphene is a new type of material in which a single layer of carbon atoms is tightly packed into a two-dimensional honeycomb lattice structure. It has received extensive attention and research since its discovery. Due to its excellent mechanical, thermal, electrical, and optical properties, graphene is expected to be used in conductive films, supercapacitors, sensors, and composite materials. However, in order to realize large-scale applications in the future, the large-scale preparation of graphene is the first problem that needs to be solved. [0003] At present, the main preparation methods of graphene are: chemical vapor deposition (CVD), epitaxial growth method on silicon c...

Claims

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Application Information

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IPC IPC(8): C08L1/04C08L1/02C08L3/02C08L5/08C08L1/08C08K3/04C09D11/52
CPCC08K3/04C08K2201/011C09D11/52C08L1/04C08L1/02C08L3/02C08L5/08C08L1/08
Inventor 黄勇高玉荣吴敏
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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