Method for preparing nanometer SiO2 by using silica sol
A silica sol and nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as difficulty in obtaining nanoparticles with uniform particle size, loss of fluidity, difficulty in stirring, etc., to achieve Uniform particle size distribution, good dispersibility, excellent dispersibility effect
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Embodiment 1
[0073] This embodiment provides a method to prepare nano-SiO by using silica sol 2 method, which is as follows:
[0074] 1) After adding 50mL of ammonia-stabilized silica sol into a three-necked flask, add 5mL (about 0.05mol) of ethyl acetate and 0.5g (about 2.6mmol) of citric acid, and conduct a reflux reaction at 76°C for 3h (milky white appears during the reaction) , carrying out magnetic stirring during the reaction; wherein, the molar concentration of silicon dioxide in the silica sol is 4.99mol / L;
[0075] 2) The reacted product is centrifuged with a high-speed centrifuge, the centrifuged product is washed with warm water containing cetyltrimethylammonium bromide (CTAB), and 95% ethanol is used for solvent replacement and aging;
[0076] 3) The aged product is vacuum-dried, then put into a muffle furnace and roasted at 550° C. for 2 hours. After the roasting is completed, the roasted product is ground to obtain the nano-SiO 2 .
[0077] The nano-SiO that this embodime...
Embodiment 2
[0083] This embodiment provides a method to prepare nano-SiO by using silica sol 2 The method, the molar concentration of silicon dioxide in the silica sol used in this method is 6.66mol / L, and others are all identical with embodiment 1.
[0084] The nano-SiO that this embodiment prepares 2 The TEM image of Figure 3A As shown, nano-SiO 2 The particles are uniformly dispersed, and the particle size is about 15nm.
[0085] The nano-SiO that this embodiment prepares 2 The particle size analysis test results are shown in Table 2, Figure 3B As shown, from Table 2, Figure 3B It can be seen that nano-SiO 2 The particle size is small, the distribution is relatively uniform, and the average particle size of the secondary particle size is about 16.53nm.
[0086] Table 2
[0087]
[0088] The nano-SiO that this embodiment prepares 2 N 2 Adsorption-desorption curves such as Figure 3C shown by Figure 3C It can be seen that the nano-SiO prepared in this example 2 N 2 T...
Embodiment 3
[0092] This embodiment provides a method to prepare nano-SiO by using silica sol 2 The method, the molar concentration of silicon dioxide in the silica sol used in this method is 8.32mol / L, and others are all identical with embodiment 1.
[0093] The nano-SiO that this embodiment prepares 2 The TEM image of Figure 4A As shown, nano-SiO 2 The particles are uniformly dispersed, and the particle size is about 75nm. The nano-SiO that this embodiment prepares 2 The particle size analysis test results are shown in Table 3, Figure 4B As shown in Table 3, Figure 4B It can be seen that nano-SiO 2 The particle size is small, the distribution is relatively uniform, and the average particle size of the secondary particle size is about 92.42nm.
[0094] table 3
[0095]
[0096] The nano-SiO that this embodiment prepares 2 N 2 Adsorption-desorption curves such as Figure 4C shown by Figure 4C It can be seen that the nano-SiO prepared in this example 2 N 2 The adsorptio...
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Abstract
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