Simulation calculation method of monolayer graphene material peeled off by dispersed carbon nanotubes

A technology of single-layer graphene and carbon nanotubes, applied in calculation, design optimization/simulation, special data processing applications, etc., can solve problems such as labor-intensive, fibrous one-dimensional material entanglement, process parameter changes, etc., to achieve The effect of reducing the cost of manpower and material resources, simplifying the determination process, and stabilizing the production effect

Inactive Publication Date: 2018-12-11
山东希诚新材料科技有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

As a one-dimensional carbon nanomaterial, carbon nanotubes have strong agglomeration effects at the micro-nano scale and intertwining and entanglement of fibrous one-dimensional materials.
For this reason, the main methods of exfoliating graphene and dispersing carbon nanotubes are usually grinding, ball milling or sand milling, etc., which require a lot of manpower and material resources to explore the process and find out the various parameters of the grinding equipment and the properties of the balls and dispersed materials. Exfoliation of graphene and dispersion of carbon nanotubes can be achieved through the complex relationship of many factors; however, the effects of exfoliation and dispersion are not stable
The effect of peeling and dispersion is very different due to the change of process parameters

Method used

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  • Simulation calculation method of monolayer graphene material peeled off by dispersed carbon nanotubes
  • Simulation calculation method of monolayer graphene material peeled off by dispersed carbon nanotubes
  • Simulation calculation method of monolayer graphene material peeled off by dispersed carbon nanotubes

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Embodiment 1

[0042] Such as Figure 1 ~ Figure 2 Shown, the simulation calculation method of the dispersed carbon nanotube of the present invention described in the present invention exfoliates single-layer graphene material, comprises the following steps:

[0043] Step 1: Establish a mathematical model based on the high-speed centrifugal movement of the grinding balls in the grinding chamber, and the trajectory of the balls colliding with each other, friction and shearing;

[0044] Step 2: According to the model calculation, the centrifugal friction shear strength

[0045] where m 总 is the total mass of the ball, v is the linear velocity of the ball when it moves centrifugally, R is the radius of the grinding chamber, and r is the radius of the ball.

[0046] It also includes step 3: deduce the blind zone between the balls according to the model, that is, the dispersion limit length of the dispersion limit zone

[0047]Calculation in step 3 shows that the dispersion limit length of...

Embodiment 2

[0070] Such as image 3 As shown, take 10.6kg of carbon nanotube powder, 2.67kg of dispersant and 200kg of solvent. The solvent is nitrogen methyl pyrrolidone NMP. In the grinding equipment, the inner cavity of the 30L grinding equipment is 244mm in diameter. Usually, those skilled in the art know that the grinding equipment adopts the continuous grinding method for grinding. Ground material. 50kg, 1.4μm balls were used to grind and disperse at a high speed for 6 hours at a linear speed of 11m / s to form a viscous carbon nanotube dispersion. Afterwards, the carbon nanotube dispersion was coated on an aluminum foil and dried for scanning electron microscope (SEM) analysis.

[0071] Depend on image 3 It can be seen that the carbon nanotube powder is composed of agglomerates of micro-nano balls of several microns to more than 10 microns. After dispersion by 1.4μm beads, if Figure 4 As shown in the SEM image of carbon nanotubes dispersed by 1.4 μm beads, the carbon nanotubes...

Embodiment 3

[0074] The diameter of the grinding ball is 1.0 μm, and the rest are the same as in Example 2. Viscous carbon nanotube dispersion is formed after grinding, such as Figure 5 shown.

[0075] Such as Figure 5 As shown, the micro-nano aggregates of carbon nanotube powder are completely opened, and the carbon tubes are uniformly dispersed. according to Calculation, the frictional shear strength between the balls ∑P=258.9GPa, which is less than the limit threshold of frictional shear 650.14GPa, the carbon nanotubes will not be sheared and torn off, and the experimental Figure 5 The results of SEM images of carbon nanotubes dispersed with 1.0 μm beads are consistent.

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Abstract

The invention relates to a simulation calculation method of monolayer graphene material peeled off by dispersed carbon nanotubes, belonging to the technical field of micro-nano material dispersing stripping technology and production process design simulation calculation. The method comprises the following steps: (1) establishing a mathematical model based on the motion trajectory of high-speed centrifugal motion of the grinding ball in the grinding chamber and mutual impact, friction and shear between the ball balls; 2, calculating according to the model, calculating centrifugal friction shearstrength (represented by an equation shown in the description), wherein m is always the total mass of the ball, v is the linear velocity of the ball in centrifugal motion, R is the radius of the grinding chamber, and r is the radius of the ball. The method greatly reduces the cost of manpower and material resources required for R & D and production, and can optimally peel off high-quality monolayer graphene and uniformly dispersed carbon nanotube dispersion.

Description

technical field [0001] The invention relates to a simulation calculation method for exfoliating a single-layer graphene material by dispersing carbon nanotubes, and belongs to the technical field of micro-nano material dispersion and exfoliation technology and production process design simulation calculation. Background technique [0002] Graphene is a single-atom-thick two-dimensional carbon material composed of carbon atoms arranged in a hexagonal honeycomb lattice with sp2 hybrid orbitals. Carbon nanotubes are mainly coaxial tubular one-dimensional carbon materials with several to tens of layers of carbon atoms arranged in a hexagonal shape. Graphene is considered to be the basic structural unit of carbon nanotubes, graphite. Graphene carbon nanotubes have ultra-high specific surface area, ultra-high electrical and thermal conductivity, and have broad application prospects in conductive films, conductive inks, anti-corrosion coatings, lithium batteries, solar cells, supe...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 陈欣
Owner 山东希诚新材料科技有限公司
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