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A kind of preparation method of porous graphene microbead

A technology of porous graphene and microbeads, which is applied in the field of preparing porous graphene microbeads, which can solve the problems that three-dimensional porous graphene microbeads have not yet been prepared, and achieve the effects of uniform diameter, broad application prospects, and improved curing rate

Inactive Publication Date: 2016-07-27
HEILONGJIANG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to continue to improve the performance of graphene, a three-dimensional stacked structure of graphene has been widely studied. Some people have prepared graphene fibers, hollow graphene balls and foam network graphene layers, etc., but three-dimensional graphene with uniform size Porous graphene microbeads have not yet been prepared

Method used

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  • A kind of preparation method of porous graphene microbead
  • A kind of preparation method of porous graphene microbead
  • A kind of preparation method of porous graphene microbead

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specific Embodiment approach 1

[0021] Specific embodiment one: a kind of method of utilizing the uniform dropwise addition method of present embodiment to prepare porous graphene microbead, carry out according to the following steps:

[0022] 1. Mix graphene oxide dry powder, polyvinylpyrrolidone powder and silica microsphere dry powder to obtain a mixture, then add deionized water to form a composite solution; wherein graphene oxide dry powder, polyvinylpyrrolidone powder and The mass ratio of silicon microsphere dry powder is 0.2:1:0.1~0.2, and the mass ratio of deionized water to mixture is 25:1;

[0023] 2. Pour the composite solution in step 1 into the syringe on the syringe pump and push it into the rotating round basin at a speed of 0.5-0.8mL / h, and directly heat and solidify to obtain composite microbeads; wherein, the The round basin contains simethicone oil;

[0024] 3. Dry the composite microbeads in step 2 at 100°C, and then pre-oxidize by step-by-step heating method; the step-by-step heating m...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratio of graphene oxide dry powder, polyvinylpyrrolidone powder and silica microsphere dry powder in step 1 is 0.2:1:0.15. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment differs from Embodiment 1 in that the receiver used in step 2 is a round basin made of high-density polyethylene. Others are the same as in the first embodiment.

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Abstract

The invention relates to a preparation method of porous graphene microbeads, particularly a manufacturing technology of porous nano carbon material microbeads. The method comprises the following steps: 1. mixing graphene oxide dry powder, polyvinylpyrrolidone powder and silicon dioxide microsphere dry powder; 2. curing to obtain composite microbeads; 3. carrying out preoxidation by multi-step heating; and 4. immersing in a hydrofluoric acid solution, and drying. The porous graphene microbeads, which are prepared by a uniform-speed dropwise addition process, have uniform diameter; and the graphene shapes inside and outside the microbeads have obvious wrinkles. The preparation method is simple and easy to implement, and can convert the two-dimensional graphene into the three-dimensional stacked-structure graphene microbeads. The graphene has high specific area and high conductivity, and has wide application prospects in the field of supercapacitor electrode materials.

Description

technical field [0001] The invention relates to a technique for preparing porous graphene microbeads by adopting a uniform-velocity dropping method. Background technique [0002] At present, the methods for preparing polymer materials in the range of several microns to tens of microns mainly include film dispersion, mechanical stirring, static mixing, colloid mill and ultrasonic dispersion. These methods can effectively carry out large-scale production, but the size uniformity of spherical particles obtained is poor, and the controllability of the process is difficult to be guaranteed. Therefore, the solution was microdispersed in the reversed-phase solution by using the uniform speed dropping technique, and then the polymer material with uniform particle size was prepared. In recent years, graphene has great potential in the field of energy storage due to its unique two-dimensional structure, large specific surface area and excellent electrical conductivity. In order to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 孙立国藏琳琳董泽良汪成张艳红
Owner HEILONGJIANG UNIV
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