Unlock instant, AI-driven research and patent intelligence for your innovation.

In situ preparation of graphene coatings by frictional reduction of graphene oxide in an inert environment

An inert environment, in-situ preparation technology, used in graphene, chemical instruments and methods, coatings, etc.

Active Publication Date: 2021-07-23
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is realized on the nanometer scale, and there is still a big gap from engineering large-scale applications.

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
  • In situ preparation of graphene coatings by frictional reduction of graphene oxide in an inert environment
  • In situ preparation of graphene coatings by frictional reduction of graphene oxide in an inert environment
  • In situ preparation of graphene coatings by frictional reduction of graphene oxide in an inert environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 1 g of graphene oxide powder, disperse it in 200 g of absolute ethanol, disperse it ultrasonically for 3 hours, and spray it on the surface of GCr15 steel to form a graphene oxide coating with a coating thickness of 4 μm;

[0027] (2) In an inert argon environment, use GCR15 steel balls as the friction partner, dry friction with the graphene oxide coating, apply a positive pressure of 0.5N, and a sliding speed of 5 cm / s, in situ on the friction slip track forming a graphene coating;

[0028] (3) Friction properties of graphene coating: The average friction coefficient of graphene coating in the stable stage is 0.05, showing excellent lubricating properties.

Embodiment 2

[0030] (1) Weigh 1 g of graphene oxide powder, disperse it in 100 g of acetone, disperse it ultrasonically for 6 hours, and spray it on the surface of the silicon wafer to form a graphene oxide coating; the thickness of the coating is 6 μm;

[0031] (2) In vacuum (-2 Pa) environment, using a steel sheet coated with a diamond-like carbon film as a friction partner, make the diamond-like carbon film dry friction with the graphene oxide coating, apply a positive pressure of 1N, and the sliding speed is 3cm / s. In-situ formation of graphene coating on the slip track;

[0032] (3) Friction properties of graphene coating: The average friction coefficient of graphene coating in the stable stage is 0.03, showing excellent lubricating properties.

Embodiment 3

[0034] (1) Weigh 1 g of graphene oxide powder, disperse it in 500 g of toluene, disperse it ultrasonically for 2 hours, and spray it on the glass surface to form a graphene oxide coating; the coating thickness is 2 μm;

[0035] (2) In an inert nitrogen environment, use TC4 titanium sheet as a friction partner, dry friction with the graphene oxide coating, apply a positive pressure of 0.2N, and a sliding speed of 5 cm / s, and form in situ on the friction slip track Graphene coating;

[0036] (3) Friction properties of graphene coating: The average friction coefficient of graphene coating in the stable stage is 0.06, showing excellent lubricating properties.

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a graphene coating in situ by reducing graphene oxide by friction in an inert environment. Firstly, the graphene oxide is ultrasonically dispersed in a volatile solvent, and sprayed on the surface of a substrate to form a graphene oxide coating. layer; then in an inert environment, using a friction pair with chemically active bonds and applying a positive pressure, dry friction is performed on the surface of the graphene oxide coating, and a graphene coating with a perfect structure is formed in situ on the friction slip track . Under the action of frictional shear force, the hydroxyl functional group of graphene oxide interacts with the active bond on the friction partner, and the C‑OH bond on graphene oxide is broken. After the fracture, the carbon atom transforms from the sp3 state to the sp2 state with more stable energy, realizes the repair of the six-membered ring structure, and forms a graphene structure on the frictional slip track. The graphene oxide coating on the friction-slip track undergoes an in-situ large-scale transformation to a perfect graphene structure due to frictional shear force and exhibits excellent lubricating properties.

Description

technical field [0001] The invention relates to a preparation method of a graphene coating, in particular to a method for preparing a graphene coating in situ by reducing graphene oxide by friction in an inert environment, and belongs to the field of nanomaterials and solid lubrication. Background technique [0002] Thanks to graphene's unique hexagonal two-dimensional carbon nanostructure in a honeycomb lattice, researchers have discovered that graphene has many excellent properties, including electricity, optics, mechanics and tribology. But these properties strongly depend on the perfect two-dimensional structure of graphene, and once the ideal two-dimensional structure is destroyed, many properties will be lost. Taking the tribological properties as an example, the study found that when the microscopic nano-tips move relative to the ideal graphene sheet, a super-lubricating state with a friction coefficient close to zero will appear, but when there are defects or functio...

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
Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/24B05D3/12B05D7/14B05D7/00C01B32/184C03C17/22
CPCB05D3/12B05D7/00B05D7/14B05D7/24B05D2202/10B05D2202/25B05D2202/35B05D2203/30B05D2203/35C01B2204/20C03C17/22C03C2217/28C03C2217/70C03C2218/112C01B32/184
Inventor 李红轩吉利高雪刘晓红周惠娣陈建敏
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI