Method for efficiently preparing graphene nanosheet material dispersed in natural polysaccharides
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF3 Cites 8 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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 preparin
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
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%.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
Thickness
aaaaa
aaaaa
Thickness
aaaaa
aaaaa
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more