Synthesizing nano crystal cobalt aluminium spinelle pigment by using solution combustion method
A technology of solution combustion and nanocrystals, applied in the direction of fibrous fillers, dyeing physical treatment, etc., can solve the problems of long time required for the synthesis process and complicated process, and achieve the effects of narrow particle size distribution, simple reaction process and simple equipment
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[0024] Example 1
[0025] Using aluminum nitrate, cobalt acetate and citric acid as raw materials, press Co 2+ :Al 3+ : Citric acid molar ratio = 1:2:2 ingredients, the method is as follows: separately dissolve aluminum nitrate, cobalt acetate and citric acid in deionized water to make a solution, mix and stir continuously, adjust the pH to 7 with ammonia water, and stir thoroughly After that, it is placed in a microwave cavity for heating. The microwave frequency is 2.45GHz and the input power is 500W. As the water vapor evaporates, the solution is concentrated to form a gel. When a certain temperature is reached, the gel ignites and self-burns for about 5 minutes, and a fluffy foamy powder is obtained. The above powder is heat-treated in the air at 700℃ for 2h to obtain the final product. Its XRD pattern is as follows figure 2 , TEM photos such as Figure 5 . CoAl made 2 O 4 The average particle size of the powder (calculated by Scherrer equation) is 19nm and the specific surfa...
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[0026] Example 2
[0027] Using aluminum sulfate, cobalt nitrate and citric acid as raw materials, press Co 2+ :Al 3+: Citric acid molar ratio = 1:2:3 ingredients, the method is as follows: respectively dissolve aluminum sulfate, cobalt nitrate and citric acid in deionized water to make a solution, mix and stir continuously, adjust the pH to 7 with ammonia water, and stir thoroughly After that, it is heated on an electric stove. As the water evaporates, a gel is formed. Then put the gel in a muffle furnace. When the temperature reaches 300°C, the gel ignites and burns for about 15 minutes to obtain a fluffy foamy powder. The above powder is heat-treated in the air at 900℃ for 1h to obtain the final product. Its XRD pattern is as follows image 3 , TEM photos such as Figure 6 . CoAl obtained 2 O 4 The average particle size of the powder (calculated by Scherrer equation) is 31nm and the specific surface area is 43m 2 / g.
Example Embodiment
[0028] Example 3
[0029] Using aluminum nitrate, cobalt nitrate and urea as raw materials, press Co 2+ :Al 3+ : Urea molar ratio = 1:2:10 ingredients, the method is as follows: separately dissolve aluminum nitrate, cobalt nitrate, and urea in deionized water to make a solution, mix and stir continuously, and heat in a microwave cavity. The microwave frequency is 2.45GHz and the input power is 500W. As the water vapor evaporates, the solution is concentrated to form a gel. When a certain temperature is reached, the gel ignites and burns spontaneously for about 2 minutes to obtain a fluffy foamy powder. The above powder is heat-treated in the air at 500℃ for 3h to obtain the final product. Its XRD pattern is as follows Figure 4 , TEM photos such as Figure 7 . CoAl obtained 2 O 4 The average particle size of the powder (calculated by Scherrer equation) is 42nm and the specific surface area is 37m 2 / g.
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