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Method for preparing graphene microsphere through normal-pressure drying

A technology of atmospheric drying and graphene, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, to achieve the effect of low cost and simple preparation process

Active Publication Date: 2015-03-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by this invention is to provide a method for preparing graphene microspheres by reverse suspension polymerization. Irreversible agglomeration and structural collapse of graphene sheets during press drying

Method used

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  • Method for preparing graphene microsphere through normal-pressure drying
  • Method for preparing graphene microsphere through normal-pressure drying
  • Method for preparing graphene microsphere through normal-pressure drying

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: with m-cresol (P), benzaldehyde (F), potassium hydroxide (C) according to the ratio of molar ratio P:F=1:3, P:C=20, be made into solid content and be 4wt% 2.5 g of sulfonated graphene was then added and uniformly dispersed in water after ultrasonic treatment, wherein the ultrasonic power was 150 W and the ultrasonic time was 40 min to obtain an aqueous phase solution with a volume of 20 mL. Pour the above aqueous phase solution into n-heptane preheated to 70°C, the water / oil volume ratio is 1:40, the addition amount of surfactant glyceryl monostearate is 2mL, and the The mixture was stirred and reacted for 120 minutes, then aged at a constant temperature of 70°C for 4 days, the graphene oxide composite microspheres were separated by standing, washed, and dried under normal pressure at 60°C. Then put the organic microspheres into a carbonization furnace, pass through argon protection, and carbonize at a constant temperature of 1300° C. for 1 hour to obtain ...

Embodiment 2

[0032] Embodiment 2: with glucinol (P), m-cresol (M), furfural (F), ammoniacal liquor (C) according to the molar ratio P:M:F=1:1:4, the ratio of P:C=300 , made into an aqueous solution with a solid content of 20wt%, then added 0.5g graphene oxide, and dispersed in water evenly after ultrasonic treatment, wherein the ultrasonic power was 100W, and the ultrasonic time was 60min, to obtain an aqueous phase solution with a volume of 10mL. Pour the above water phase solution into cyclohexane preheated to 60°C, the water / oil volume ratio is 1:10, the addition amount of surfactant span-20 is 8mL, and the reaction is stirred at a speed of 1400rpm / min 30 minutes, then aged at 60°C for 2 days, left to separate the graphene oxide composite microspheres, washed, and dried at 80°C under normal pressure. Then put the organic microspheres into a carbonization furnace, pass through nitrogen protection, and carbonize at a constant temperature of 700° C. for 4 hours to obtain graphene composite...

Embodiment 3

[0033] Embodiment 3: with resorcinol (P), melamine (A), formaldehyde (F), sodium bicarbonate (C) according to molar ratio P:A:G=1:2:7, P:C=1000 Ratio, made into an aqueous solution with a solid content of 40wt%, then added 1.5g of nitrogen-doped graphene, and dispersed in water evenly after ultrasonic treatment, wherein the ultrasonic power was 60W, and the ultrasonic time was 120min, to obtain an aqueous phase solution with a volume of 8mL. Pour the above water phase solution into the peanut oil which has been preheated to 100°C, the volume ratio of water / oil is 1:100, the volume ratio of surfactant glyceryl monostearate and span-80 is 1:2, and the total addition amount is 15mL, stirred and reacted for 60 minutes at a rotation speed of 2000rpm / min, then aged at a constant temperature of 100°C for 7 days, stood still to separate graphene oxide composite microspheres, washed, and dried under normal pressure at 20°C. Then put the organic microspheres into a carbonization furnace, ...

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Abstract

The invention discloses a method for preparing a graphene microsphere through normal-pressure drying. A reaction system comprises graphenes, phenols, aldehydes, amines, a catalyst, a surfactant, an oil phase and water. A reaction is carried out in a reverse suspension polymerization manner. The graphene microsphere is prepared through the normal-pressure drying. In the method, the composite graphene microsphere is prepared through polymerization on a water / oil interface through a reaction solution. The employed oil phase can be used repeatedly during the preparation process. The method is simple and environmentally-protective. The graphene microsphere is low in preparation cost. In addition, an organic microsphere can be subjected to carbonization under an inert atmosphere to obtain the graphene microsphere. The graphene microsphere can be applied in the fields of micro-electronic, energy-storing materials, drug supporters, a lithium ion battery, a supercapacitor, an electro-adsorption electrode material and the like.

Description

technical field [0001] The invention relates to a method for preparing graphene microspheres by normal pressure drying Background technique [0002] Graphene is a carbon atom with sp 2 The hexagonal two-dimensional material with a honeycomb lattice composed of hybrid orbitals is a new sheet-like material with a thickness of only one carbon atom. It is currently the thinnest and hardest nanomaterial in the world, and it is almost completely transparent. It only absorbs 2.3% of light, its thermal conductivity is as high as 5300 W / m K, and its electron mobility at room temperature exceeds 15000 cm 2 / V·s, and the resistivity is only about 10 -8 Ω·cm, lower than copper or silver, is the material with the smallest resistivity in the world. Due to its unique two-dimensional structure, high thermal conductivity and electron mobility, low resistivity, and high mechanical strength, graphene has attracted more and more attention. However, graphene is different from other porous ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00B82Y40/00
Inventor 刘玲孟庆函廖柳辉
Owner BEIJING UNIV OF CHEM TECH
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