A method for preparing graphene microspheres by atmospheric pressure drying

A technology of normal pressure drying and ene microspheres, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, and achieves the effect of simple preparation process and low cost

Active Publication Date: 2016-07-06
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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  • A method for preparing graphene microspheres by atmospheric pressure drying
  • A method for preparing graphene microspheres by atmospheric pressure drying
  • A method for preparing graphene microspheres by atmospheric pressure drying

Examples

Experimental program
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Embodiment 1

[0031] Example 1: The solid content of m-cresol (P), benzaldehyde (F), and potassium hydroxide (C) is 4wt% according to the molar ratio of P:F=1:3, P:C=20 Then add 2.5g of sulfonated graphene, and disperse it evenly in water after ultrasonic treatment, where the ultrasonic power is 150W, the ultrasonic time is 40min, and an aqueous solution with a volume of 20mL is obtained. Pour the above aqueous solution into n-heptane that has been preheated to 70℃, the volume ratio of water / oil is 1:40, the addition amount of surfactant glyceryl monostearate is 2mL, and the rotation speed is 200rpm / min. Stir and react for 120 minutes, then age at 70°C for 4 days, stand still to separate the graphene oxide composite microspheres, wash, and dry at 60°C under normal pressure. Then, the organic microspheres were put into a carbonization furnace, and argon gas protection was introduced, and the carbonization was performed at a constant temperature of 1300° C. for 1 hour to obtain graphene compos...

Embodiment 2

[0032] Example 2: Benzenetriol (P), m-cresol (M), furfural (F), and ammonia (C) are in a molar ratio of P:M:F=1:1:4, P:C=300 , Prepared into an aqueous solution with a solid content of 20% by weight, then added 0.5 g of graphene oxide, and uniformly dispersed in water after ultrasonic treatment, wherein the ultrasonic power was 100 W, the ultrasonic time was 60 minutes, and the aqueous solution with a volume of 10 mL was obtained. Pour the above aqueous solution into cyclohexane which has been preheated to 60℃, the volume ratio of water / oil is 1:10, the addition amount of surfactant span-20 is 8mL, and the reaction is stirred at 1400rpm / min. 30 minutes, then 60°C constant temperature aging for 2 days, stand still to separate the graphene oxide composite microspheres, wash, and dry at 80°C under normal pressure. Then, the organic microspheres are put into a carbonization furnace, and are protected by nitrogen gas, and carbonized at a constant temperature of 700° C. for 4 hours t...

Embodiment 3

[0033] Example 3: Combining resorcinol (P), melamine (A), formaldehyde (F), and sodium bicarbonate (C) in a molar ratio of P:A:G=1:2:7, P:C=1000 The ratio is prepared into an aqueous solution with a solid content of 40 wt%, then 1.5 g of nitrogen-doped graphene is added and dispersed in water uniformly after ultrasonic treatment, where the ultrasonic power is 60 W, the ultrasonic time is 120 min, and an aqueous solution with a volume of 8 mL is obtained. Pour the above aqueous solution into peanut oil that 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 amount added is 15 mL, stirred for 60 minutes at a rotation speed of 2000 rpm / min, and then aged at 100°C for 7 days. The graphene oxide composite microspheres were separated by standing, washed, and dried under normal pressure at 20°C. Then, the organic microspheres are put into a carbonization furnace, and are protected ...

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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 drying at normal pressure Background technique [0002] Graphene is a kind of sp 2 The hexagonal two-dimensional material with a honeycomb lattice composed of hybrid orbitals is a new sheet-like material with the thickness of only one carbon atom. It is currently the thinnest and hardest nanomaterial in the world. It is almost completely transparent. Only absorb 2.3% of light, its thermal conductivity is as high as 5300W / m·K, and the electron mobility at room temperature exceeds 15000cm 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. Graphene has attracted more and more attention due to its unique two-dimensional structure, high thermal conductivity and electron mobility, low resistivity, and high mechanical strength. However, graphene is different from other porous carbon materials. Its spe...

Claims

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Application Information

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Patent Type & Authority Patents(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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