A kind of graphene nanosheet material dispersed in natural polysaccharide and preparation method thereof

A technology of graphene nanosheets and natural polysaccharides, applied in the field of nanomaterials, can solve the problems of complex preparation process, incomplete structure of reduction method, low cost, etc., and achieve the effect of low cost and easy mass production

Active Publication Date: 2017-08-25
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, the level of preparation of graphene so far is only on the laboratory scale, and industrial production 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 graphite oxide GO is currently the most widely used method for preparing graphene nanosheets, but the preparation process still has problems of complexity and small scale. Incompleteness leads to certain defects in the structure

Method used

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  • A kind of graphene nanosheet material dispersed in natural polysaccharide and preparation method thereof
  • A kind of graphene nanosheet material dispersed in natural polysaccharide and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] A preparation method for preparing the graphene nanosheet material dispersed in natural polysaccharides, the method may further comprise the steps:

[0027] Microcrystalline cellulose derived from natural herbal cellulose is mixed with solid graphite at a weight ratio of 99:1, the mixture is added to a grinder, and mechanical grinding is carried out without adding any grinding agent. The grinding speed is 300r.p.m, and the time is 16h. The thickness of the natural herbal cellulose is 0.35-7nm single-layer graphene nano sheet material.

Embodiment 2

[0029] Same as Example 1, the difference is that the natural herbal cellulose is replaced by natural woody cellulose; the natural woody cellulose is mixed with solid graphite at 20:1 by weight; the grinding speed is 500r.p.m, and the time is 2h; A single-layer graphene nanosheet material with a thickness of 0.35-7nm dispersed in natural woody cellulose was obtained.

Embodiment 3

[0031] A preparation method for preparing the graphene nanosheet material dispersed in natural polysaccharides, the method comprises the following steps: mixing natural herb cellulose and solid graphite by 1:1 weight, adding the mixture to a grinder, and then adding The solvent DMF with 50 times the quality of natural polysaccharides is mechanically ground, the grinding speed is 300r.p.m, and the time is 24h; the single-layer or multi-layer graphene nanosheets with a thickness in the range of 0.35nm to 7nm dispersed in natural herbal cellulose are obtained. materials (such as figure 1 ).

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Abstract

The invention relates to a graphene nanosheet material dispersed in natural polysaccharides and a preparation method thereof. The graphene nanosheet material is dispersed in natural polysaccharides. The present invention mixes natural polysaccharides with solid graphite, adds a certain proportion of solvent or directly grinds the mixture mechanically without any addition, and obtains single-layer or multi-layer graphite dispersed in natural polysaccharide nanomaterials with a thickness of 0.35nm to 7nm ene nanosheet composites. The graphene nanosheet material prepared by the present invention uses natural polysaccharides as a dispersant to disperse around the graphene nanosheets, and the hydrophobic parts of the graphene nanosheets and natural polysaccharide interfaces reach nanoscale fusion, resulting in strong interaction (van der Waals force) , increasing the mutual affinity, thereby inhibiting the re-aggregation of graphene nanosheets, and also inhibiting some common crystal transformations of natural polysaccharides, and obtaining graphene nanosheet materials with stable properties.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a graphene nanosheet material dispersed in cellulose and a preparation method thereof. Background technique [0002] Graphene is a new carbonaceous material in which a single layer of carbon atoms is tightly packed into a two-dimensional honeycomb lattice structure. After exfoliation, graphite materials with layered structure will obtain single-layer or multi-layer graphene nanosheets. The connections between the carbon atoms in graphene are very flexible. When an external mechanical force is applied, the surface of the carbon atoms bends and deforms, so that the carbon atoms do not need to be rearranged to adapt to the external force, and the structure remains stable. The stable lattice structure of graphene makes it have exceptional electrical conductivity, perfect quantum tunneling effect, half-integer quantum Hall effect, and good mechanical, optical and thermal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08L5/08C08L3/02C08K3/04C01B32/19
Inventor 吴敏黄勇空闲重则孙佩佩
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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