A preparation method of monodisperse ultra-small silica nanoparticles
An ultra-small silicon dioxide and nanoparticle technology, applied in the directions of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems of high energy consumption, high reaction temperature, complex preparation process, etc., and achieve low energy consumption and simple preparation. , good dispersion effect
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[0028] The invention provides a method for preparing monodisperse ultra-small silica nanoparticles, comprising the following steps:
[0029] SiO 2 Spheres, water and protective agent mixed, for SiO 2 The ball is coated to obtain the coating mixture;
[0030] The coating mixture is mixed with an etchant, and an etching reaction is carried out under the condition of stirring at room temperature to obtain monodisperse ultra-small silicon dioxide nanoparticles.
[0031] SiO 2 Spheres, water and protective agent mixed, for SiO 2 The balls were coated to obtain a coating mix.
[0032] In the present invention, the SiO 2 The particle size of the spheres is preferably 50 nm to 2 μm, preferably 200 nm to 1 μm, most preferably 300 to 500 nm. The present invention to the SiO 2 There is no special requirement for the source of the ball, and commercially available products or well-known products known to those skilled in the art are used. can be synthesized.
[0033] Before mixin...
Embodiment 1
[0050] use Synthesized SiO with a particle size of 340nm 2 The ball, ethanol and water were alternately centrifuged and washed 6 times at 8000 rpm for 5 minutes, and dried in a vacuum oven at 80°C for 10 hours. Weigh 0.6 g of synthesized SiO 2 Sonicate the balls for 20min and disperse them in a beaker with 40mL of water, add 0.5g polyvinylpyrrolidone (PVP) as a protective agent, stir at room temperature for 3h at a speed of 300rpm, coat the surface of the silica nanospheres with PVP, and then add 0.20g NaOH was used as an etchant, reacted at room temperature for 10 hours, and the product was washed twice with ethanol and water alternately by centrifugation at 15,000 rpm for 10 minutes, and dried in a vacuum oven at 80°C for 10 hours to obtain monodisperse ultra-small silica nanoparticles .
[0051] SiO before coating 2 balls, coated SiO 2 After 5 hours of ball and etching reaction, SiO 2 The ball and the product after the etching reaction was carried out for 10h were ob...
Embodiment 2
[0053] use Synthesized SiO with a particle size of 340nm 2 Nanospheres, ethanol and water were alternately centrifuged and washed 6 times at 8000 rpm for 5 minutes, and dried in a vacuum oven at 80°C for 10 hours. Weigh 0.6 g of synthesized SiO 2 Nanospheres were dispersed in a beaker with 40mL of water by ultrasonication for 20min, and 0.5g of polyvinylpyrrolidone (PVP) was added as a protective agent, stirred at room temperature for 3h at a speed of 300rpm to coat the surface of silica nanospheres with PVP, and then added with 0.36 g NaOH was used as an etchant, reacted at room temperature for 5 hours, and the product was washed twice with ethanol and water alternately at 15,000 rpm for 10 minutes, and dried in a vacuum oven at 80°C for 10 hours to obtain silica nanoparticles.
[0054] The obtained silica nanoparticles were observed by transmission electron microscope, and the results were as follows: Figure 5 shown. Figure 5 It was shown that after etching with 0.36g...
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