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Preparation method of graphene foam

A graphene foam, graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of uneven heating in microwave heating area, damage of graphene derivative materials, uneven electric field, etc. Fast and efficient heating, improved heating unevenness, and precise control of heating time

Inactive Publication Date: 2017-05-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem in the microwave heating treatment of graphene derivative materials is the problem of uneven heating in the microwave heating zone, which is related to the uniformity of the heating electric field in the microwave oven. Although the heating uniformity of the microwave oven can be improved by designing such as a curved antenna structure, The unevenness of the electric field is difficult to avoid, and the effect of uneven heating will cause the effect of the conversion of graphene derivative materials into graphene to be different in different regions and affect the overall performance, and if the heating time is increased, some graphene derivative materials may occur because Damaged by overheating, while another part may not be well restored

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, graphene oxide powder and reduced graphene oxide powder are prepared. 30 grams of graphite mixed with 15 grams of sodium nitrate and 750 milliliters of concentrated sulfuric acid. The mixture was cooled to 0°C in an ice bath, and after stirring for 2 h, 90 g of potassium permanganate was slowly added, keeping the temperature of the mixture below 5°C during the mixing process. The mixture was stirred for another hour and allowed to warm to room temperature by removing the ice bath. Add 1 liter of distilled water to the mixture and increase the temperature in the oil bath to 90°C. Another 300 ml of water were added and stirred for another hour and a half. The color of the mixture turned brown. The mixture was then treated and diluted with 30% hydrogen peroxide in 300 ml and 30 liters of hot water. The mixture was further washed with excess water until the pH of the filtrate was almost neutral to obtain graphene oxide. Then graphene oxide was dispersed in water...

Embodiment 2

[0021] Put 50 ml of 5 mg / ml graphene oxide aqueous solution into a volume-matched nickel foam, then sonicate to remove air bubbles, then add 0.3 g of ascorbic acid, sonicate for 5 minutes, and then react at 95 degrees Celsius for 6 hours to obtain the reduction The graphene oxide hydrogel-wrapped nickel foam composite was soaked in deionized water to remove excess reagents and then freeze-dried to obtain a composite foam of reduced graphene oxide foam and nickel foam. The composite foam is heated in a 10 cm diameter heating area of ​​a microwave oven with a power of 800 W at room temperature at a speed of 0.05 m / s in a vacuum environment of 2 KPa for about 2 seconds, and then enters the room temperature area for cooling. Repeat the microwave heating-cooling process for 6 times, and the reduced graphene oxide in the composite foam is converted into graphene, and its carbon content is greater than 90%, which is to obtain the composite foam material of graphene foam wrapped nickel...

Embodiment 3

[0023] Put 50 ml of 5 mg / ml graphene oxide aqueous solution into a volume-matching polyurethane foam, and then sonicate for 10 minutes to remove air bubbles, then add 0.3 g of ascorbic acid and 0.3 ml of hydroiodic acid, and sonicate for 5 minutes, then at 95 After reacting for 6 hours at 100°C, a composite of polyurethane foam wrapped with reduced graphene oxide hydrogel was obtained. Then the composite was soaked in deionized water to remove excess reaction reagents and then freeze-dried to obtain a composite foam of reduced graphene oxide foam and polyurethane foam. Under the protection of nitrogen at minus 10 degrees Celsius, the composite foam is heated by a conveyor belt at a speed of 0.1 m / s through a 10 cm diameter heating area of ​​a microwave oven with a power of 800W for about 1 second, and then enters a minus 10 degrees Celsius area for cooling. Repeat the microwave heating-cooling process 10 times, and the reduced graphene oxide in the composite foam is converted ...

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Abstract

The invention discloses a preparation method of graphene foam. The preparation method comprises the following steps: firstly, graphene derivative foam is prepared from a graphene derivative solution; then the graphene derivative foam passes through a microwave heating region at a set speed in a set atmosphere, and the graphene derivative foam is heated to convert graphene derivatives into graphene which is cooled to obtain the graphene foam. The method provided by the invention solves problems of high energy consumption, low yield and graphene derivative foam performance requiring to be improved due to the existing graphene foam needs high temperature vapor deposition, realizes convenient, fast and mass production of the graphene foam material, and is expected to contribute to further development and application of graphene and foam materials.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a graphene foam, especially utilizing graphene derivatives which are easy to disperse and have microwave absorption characteristics. First, the graphene derivatives are formulated into a solution, and then the graphene derivative solution is prepared into a graphene derivative foam , and then the graphene derivative foam is subjected to microwave heating treatment through a microwave heating zone at a set speed and under a set atmosphere to convert the graphene derivatives therein into graphene, and then cooled to obtain the graphene foam. Background technique [0002] As a two-dimensional material, graphene has excellent mechanical properties (Young's modulus up to 1.0TPa), electrical properties (electron mobility up to 10 6 cm 2 .v -1 the s -1 ), thermal properties (thermal conductivity up to 5000w.m -1 .k -1 ), optical properties (the visible light absorption of single-layer graphe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194C08L75/04C08K7/24
CPCC08K7/24C01B2204/22C08L75/04
Inventor 张继中
Owner SOUTHEAST UNIV
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