Preparation method for hollow carbon hemisphere
A technology of hollow carbon and hemisphere, applied in the field of materials, to achieve the effect of simple equipment and operation, regular shape and low cost
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Embodiment 1
[0025] Add 1 gram of polystyrene spheres with a particle size of 1.3 microns, 2 grams of glucose, and 40 ml of deionized water into a 50 mL autoclave lined with a polytetrafluoroethylene liner, and stir evenly. Seal the autoclave, place it in an oven, raise the temperature to 160°C, and keep it warm for 15 hours. After cooling, the solid powder was filtered and washed with water and ethanol, dried, and placed in a microwave oven at 2.45 GHz with a system power of 2,000 W. The microwave was heated alternately for 80 seconds, stopped for 60 seconds, and then microwaved for 80 seconds. The obtained product was placed in a tube furnace, under the protection of nitrogen, the temperature was raised to 900°C at 10°C / min, and the temperature was maintained for 3 hours to obtain a hollow carbon hemisphere with a diameter of 1.6 microns, slightly higher than the particle size of the template (1.3 microns). The thickness of the carbon shell is about 200 nm, as figure 1 shown.
Embodiment 2
[0027] Add 1 gram of polystyrene spheres with a particle size of 535 nm, 1 gram of glucose, and 20 ml of deionized water into a 50 mL autoclave lined with a polytetrafluoroethylene liner, and stir evenly. Seal the autoclave, place it in an oven, raise the temperature to 230°C, and keep it warm for 6 hours. After cooling, the solid powder was filtered and washed with water and ethanol, dried, and placed in a microwave oven at 2.45 GHz with a system power of 2000 W for continuous microwave heating for 120 seconds. The obtained product was placed in a tube furnace, under the protection of nitrogen, the temperature was raised to 600°C at 10°C / min, and the temperature was maintained for 6 hours to obtain a hollow carbon hemisphere with a diameter of 580 nm and a carbon shell thickness of about 110 nm.
Embodiment 3
[0029] Add 1 gram of polystyrene spheres with a particle size of 1.3 microns, 1.5 grams of sucrose, and 15 ml of deionized water into a 50 mL autoclave lined with a polytetrafluoroethylene liner, and stir evenly. Seal the autoclave, place it in an electric oven, raise the temperature to 120°C, and keep it warm for 48 hours. After cooling, the solid powder was washed with water and ethanol by suction filtration, dried, placed in a muffle furnace, raised to 400°C for 10 minutes under an air atmosphere at 10°C / min, and then cooled. The obtained product was placed in a tube furnace, under the protection of argon, the temperature was raised to 600°C at 5°C / min, and the temperature was maintained for 10 hours. The particle size of the obtained hollow carbon hemisphere is about 1.55 microns, which is slightly higher than the template particle size (1.3 microns). The thickness of the carbon shell is about 160 nanometers.
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Abstract
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