A kind of preparation method of monodisperse ultra-small particle size ceria nanocrystal
A ceria, monodisperse technology, applied in the preparation/processing of rare earth metal compounds, ceria/ceria hydroxide, nanotechnology, etc., can solve the problems of expensive oily solvent, large particle size, poor dispersibility, etc. Simple process, good dispersion and low cost
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[0017] A method for preparing monodisperse ultra-small particle size ceria nanocrystals, the method comprising the following steps:
[0018] (1) Dissolve cerium nitrate hexahydrate in deionized water to make a cerium nitrate solution, then add N,N-dimethylformamide and triethanolamine to mix, and magnetically stir to obtain a uniform mixed solution;
[0019] (2) Transfer the mixed solution obtained in step (1) to a polytetrafluoroethylene-lined hydrothermal reaction kettle, seal it, place it in an oven, heat and keep it warm, and after the reaction is over, cool the product to room temperature and centrifuge the precipitate After separation and washing, the cerium dioxide nanocrystalline material is obtained.
[0020] The concentration of the cerium nitrate solution in the step (1) is 0.02~0.08 mol / L; the volume ratio of the triethanolamine to the cerium nitrate solution and N,N-dimethylformamide is 1:6~16:54 ~64.
[0021] The heating temperature of the oven in the step (2) ...
Embodiment 1
[0023] (1) Dissolve 0.40 g cerium nitrate hexahydrate in 20 mL deionized water and stir magnetically to obtain a cerium nitrate solution; then add 120 mL N,N-dimethylformamide and stir magnetically for 15 min; then add 2 mL triethanolamine , magnetically stirred for 30 min to obtain a uniform mixed solution;
[0024] (2) Take 35mL of the mixed solution obtained in step (1), transfer it to a polytetrafluoroethylene-lined reaction kettle, seal it, heat it in an oven at 150°C, and keep it warm for 7 hours. After the reaction is completed, cool the product to room temperature , centrifuge the precipitate, wash 3 times with deionized water and absolute ethanol to obtain ceria nanocrystalline material, such as figure 1 shown.
Embodiment 2
[0026] (1) Dissolve 0.40 g cerium nitrate hexahydrate in 20 mL deionized water and stir magnetically to obtain a cerium nitrate solution; then add 120 mL N,N-dimethylformamide and stir magnetically for 15 min; then add 2 mL triethanolamine , magnetically stirred for 30 min to obtain a uniform mixed solution;
[0027] (2) Take 35mL of the mixed solution obtained in step (1), transfer it to a polytetrafluoroethylene-lined reaction kettle, seal it, heat it in an oven at 160°C, and keep it warm for 6 hours. After the reaction is over, cool the product to room temperature , centrifuge the precipitate, wash 3 times with deionized water and absolute ethanol to obtain ceria nanocrystalline material, such as figure 2 shown.
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