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Two-dimensional thin film material coated on microsphere surfaces and simple method for stripping two-dimensional thin film material

A technology of two-dimensional materials and thin-layer materials, which is applied in the preparation of microspheres, chemical instruments and methods, and microcapsule preparations. Synapse, complete crystal structure, good product quality effect

Active Publication Date: 2017-10-03
西安一九零八新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the tape method and the three-roller grinding and stripping method are simple in process, the thickness of the product is not easy to control; the plasma etching method and the slight friction method have high product quality, but the output is very small and the process is complicated and high in cost; the fluid stripping method has fast response and low cost , but requires a special reaction vessel, and the reaction conditions are relatively harsh; the traditional ball milling method is low in cost and simple in process, but the graphite flakes are prone to defects and the product is prone to agglomeration due to the strong extrusion of the ball; the low energy pure shear milling method avoids Impact, so that the product has a relatively complete crystal structure, but due to the limited energy provided, the thickness of the product cannot reach the level of a single layer

Method used

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  • Two-dimensional thin film material coated on microsphere surfaces and simple method for stripping two-dimensional thin film material
  • Two-dimensional thin film material coated on microsphere surfaces and simple method for stripping two-dimensional thin film material
  • Two-dimensional thin film material coated on microsphere surfaces and simple method for stripping two-dimensional thin film material

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preparation example Construction

[0053] A kind of preparation method of the core-shell structure of graphene-coated aluminum oxide particles provided by the invention comprises the following steps:

[0054] a) graphite balls are put into a beaker filled with dilute hydrochloric acid; the size of graphite balls is between 5mm and 15mm, preferably between 8mm and 10mm, and is processed by high-pressure graphite with a purity of 99.99%. No polishing, no surface treatment; the concentration of hydrochloric acid is between 1:6 and 1:1; ultrasonic cleaning at room temperature, the ultrasonic power is between 30W and 60W, and the cycle is between 10 and 20min. Replace the solution and repeat the above step 3 times to 10 times until the cleaning solution no longer becomes turbid; remove the tiny graphite debris on the surface of the graphite ball to make the surface smooth;

[0055] b) mixing graphite balls and alumina particles in proportion, the mass ratio of graphite balls to alumina is between 1:2 and 2:1, prefer...

Embodiment 1

[0063] a) Take ten graphite balls, the diameter of graphite balls is 10mm, and the total mass is 10g; put it into a beaker filled with dilute hydrochloric acid, the concentration of hydrochloric acid is 1:6; ultrasonic cleaning at room temperature, ultrasonic power is 45W, cycle After 15 minutes, replace the solution with a new solution and repeat the above steps 5 times until the cleaning solution no longer becomes turbid; remove the tiny graphite debris on the surface of the graphite ball to make the surface smooth;

[0064] b) mixing graphite balls and alumina particles in a mass ratio of 1:1, weighing 10 g of alumina particles; the size of the alumina particles is between 200 μm and 300 μm;

[0065] c) Put mixture A into a 50ml agate ball mill jar, the total volume of graphite balls and alumina is 1 / 4 of the total volume; mix with a ball mill under air atmosphere, the speed is 500rpm, and the time is 2.5h to get mixture B ;

[0066] d) The graphite spheres in the mixture ...

Embodiment 2

[0068] a) take by weighing the aluminum oxide particles uniformly coated with graphene obtained in Example 1, 5g, into a 30ml reagent bottle;

[0069] b) Add 20ml of 1,2-dichloroethane to the reagent bottle, ultrasonic; the ultrasonic power is 45W, and the time is 5 minutes; the graphene on the surface of the alumina particles is all transferred to the solution;

[0070] c) Using a 100-mesh filter screen to separate the alumina particles from the liquid to obtain a graphene dispersion.

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Abstract

The invention discloses a simple method for performing coating modification on microsphere surfaces by using a two-dimensional material thin film, a simple method for stripping the two-dimensional material, and products formed by coating and stripping. In the coating process, no solvent is used, a physical friction transfer method is adopted to transfer a lamellar compound thin film from the surface of a lamellar compound sphere to the surface of the microsphere, and screening is performed to obtain the coated product by utilizing the size difference between the product (coated microsphere) and the lamellar compound sphere. The whole process has the advantages of simple technique, low cost, high efficiency and high product purity, and is suitable for industrial production. In addition, the lamellar compound can be transferred from the microsphere surface into the solution by simple ultrasonic treatment in the solution; and thus, the invention provides a simple non-chemical method for stripping the lamellar compound, which is suitable for industrial production.

Description

technical field [0001] The invention relates to a new method for coating modification of microspheres and stripping two-dimensional materials, and belongs to the technical field of new energy materials and their preparation. Background technique [0002] Oxide microspheres such as alumina are a common material with both insulation and thermal conductivity properties. It is often used as a filler additive. For example, it can not only be used in insulating rubber to improve the mechanical strength of rubber, but also in ceramics, Insulation and heat conduction fillers, strengthened glass fillers, surface protection coatings, optical materials, catalyst carriers, and many other uses. Aluminum oxide, however, is not electrically conductive. Graphene has the characteristics of extremely high electron carrying rate, high electrical conductivity, high thermal conductivity, and high strength. Researchers naturally thought of coating thin layers of graphene on alumina particles to...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B32/19B01J13/02B01J13/22
CPCB01J13/02B01J13/22C01B2204/04C01F7/021C01P2004/03C01P2004/04C01P2004/60C01P2004/80
Inventor 张锦英黄家良牛春明李俊季欣李智辉
Owner 西安一九零八新能源科技有限公司
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