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
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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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