Method for preparing graphene nanoplatelets by viscously mechanical shearing and stripping

A technology of graphene microchips and mechanical shearing, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as unstable quality, unfavorable promotion, slow reaction process, etc., to achieve easy control of the preparation process, good Prospect of industrialization, effect of low preparation cost

Active Publication Date: 2016-06-01
平邑仁安中医药产业发展有限公司
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cavitation is accompanied by a severe process of local high temperature and high pressure, which causes large defects in graphene and unstable quality.
[0006] In the Chinese patent CN103723707A, a method for preparing graphene flakes and the prepared graphene flakes are disclosed, which discloses that highly graphitized graphene is dispersed into graphene flakes by fluid force, but its mode of action requires fluid to pass through A circulatory system containing a nozzle, so that the fluid acts on the surface or side of the highly graphitized graphene, that is, the method of preparing graphene through the force of the fluid requires supporting equipment to be realized, which is not conducive to large-scale promotion
[0007] In another Chinese patent application CN201510174415.5, a method for preparing graphene by rotating and shearing...

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Dissolve 10g of polyvinyl alcohol with an average molecular weight of 200,000 and an alcoholysis degree of 50% in 50g of DMF, and heat it under reflux at 60°C for 30 minutes to dissolve completely, then add 0.003g of borax, which is a chemical-grade powder Borax-like, after stirring evenly, a viscous solution is obtained

[0040] (1) Add 6g of graphite crystals into the above-mentioned viscous solution, and carry out preliminary stirring to obtain a mixed solution;

[0041](2) Use a high-speed shear mixer to perform high-shear stirring on the mixed solution at a stirring rate of 10,000r / min. It can be observed that the graphite crystals continue to become thinner, and stop stirring when all the mixed solution is filled with smiling graphite flakes;

[0042] (3) Take out part of the mixed solution and dilute it with DMF, then filter to obtain a solid, and burn the solid until the quality does not change to obtain the graphene microsheets;

[0043] After testing, it ...

Embodiment 2

[0045] (1) Mix 10g of polyvinyl alcohol with an average molecular weight of 200,000 and a degree of alcoholysis of 50% with 10g of polyvinyl alcohol titanate with an average molecular weight of 150,000 and a degree of alcoholysis of 70%, and dissolve them in 60g of DMF. After heating at reflux for 20min at ℃, the solution is completely dissolved, and then 0.01g of borax is added, which is chemical grade powdered borax, and the viscous solution is obtained after stirring evenly

[0046] (2) Add 8g of graphite crystals into the above-mentioned viscous solution, and carry out preliminary stirring to obtain a mixed solution;

[0047] (3) Use a high-speed shear mixer to carry out high-shear stirring on the mixed solution at a stirring rate of 11000r / min. It can be observed that the graphite crystals are continuously thinning, and when the mixed solution is full of smiling graphite flakes, stop stirring;

[0048] (4) Take out part of the mixed solution and dilute it with DMF, then f...

Embodiment 3

[0051] (1) Mix 10g of polyvinyl alcohol with an average molecular weight of 200,000 and a degree of alcoholysis of 40% with 10g of polyvinyl alcohol titanate with an average molecular weight of 200,000 and a degree of alcoholysis of 60%, and dissolve it in 120g of DMF, at 70°C Dissolve completely after heating under reflux for 20 minutes, then add 0.001g borax and 0.001g nano-silicon dioxide, and then add 0.01g silane coupling agent KH550, the borax is chemical grade powdery borax, and the adhesiveness can be obtained after stirring evenly solution;

[0052] (2) Add 10g of graphite crystals into the above-mentioned viscous solution, and perform preliminary stirring to obtain a mixed solution;

[0053] (3) Use a high-speed shear mixer to carry out high-shear stirring on the mixed solution at a stirring rate of 12000r / min. It can be observed that the graphite crystals are continuously thinning, and when the mixed solution is full of smiling graphite flakes, stop stirring;

[00...

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

No PUM Login to view more

Abstract

The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene nanoplatelets by viscously mechanical shearing and stripping. According to the method, graphite is dispersed in a viscous solution, the viscous solution is quickly connected with surface atoms of graphite crystal after contacting with the graphite crystal, a binding force between the viscous solution and the surface atoms of the graphite crystal is larger than an interlamination bonding force of the graphite crystal, and by taking the advantage of a viscous shearing force of the viscous solution, graphite is gradually stripped in a stirring process to obtain graphene. The method for preparing the graphene nanoplatelets by viscously mechanical shearing and stripping has the advantages of low preparation cost, easiness in control of a preparation process, environment friendliness, simple procedures and promising industrial prospect.

Description

technical field [0001] The invention relates to the technical field of graphene preparation. In particular, it relates to a method for preparing graphene microsheets by viscous mechanical shear exfoliation. Background technique [0002] Graphene is a planar atomic crystal structure in which carbon atoms are closely arranged in a honeycomb shape in regular hexagons. The unique planar structure of graphene makes it possess many characteristics that three-dimensional crystals do not have, such as a specific surface area of ​​up to 2.6×103m2 / g , the thermal conductivity is as high as 3×103W / (m.K), the mechanical properties are 1.06×103Gpa, the Young’s modulus is 1.0TPa, and its mechanical strength is as high as 130Gpa, which is more than 100 times that of steel. Graphene has a stable regular hexagonal lattice structure so that it has excellent electrical conductivity, and the electron mobility is as high as 1.5×10 4 cm 2 / (V.s), which is 2 times higher than the maximum mobili...

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
no application Login to view more
IPC IPC(8): C01B31/04
CPCC01B2204/04
Inventor 陈庆曾军堂叶任海陈韦坤
Owner 平邑仁安中医药产业发展有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap