A kind of preparation hollow structure sio 2 nanoparticle approach
A nanoparticle and hollow structure technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as difficult hollow particle size control, difficult control, lack of direct and effective evidence in the etching process, etc. , to achieve good monodispersity, simple and effective synthesis method, controllable size and shell thickness
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Embodiment 1
[0027] Example 1: Solid SiO with different sizes 2 Preparation of nanoparticles (fix catalyst concentration, change reaction time)
[0028] In the 50mL ethanol system, add 1mL water, then add 1ml 0.11mol / L TMAH aqueous solution, after the reaction temperature is constant at 25°C, quickly add 1.25mL TEOS, and continue to stir the reaction at a constant temperature of 25°C for different times (0.5 h, 1h, 3h and 6h), after the reaction, the four samples were centrifuged to remove the supernatant, and after washing again, the four particles were respectively dispersed in 30mL pure water to prepare 130nm, 155nm, 175nm, and 200nm, respectively. Solid SiO with good dispersion 2 Nanoparticles.
[0029] The four particle samples were characterized by infrared spectroscopy (see figure 2 ), it can be clearly observed that the relative content of TMAH in the four particle samples is different, and the degree of "Si-O-Si" condensation is also different. The shorter the reaction time, t...
Embodiment 2
[0030] Example 2: Solid SiO with different sizes 2 Preparation of nanoparticles (fixed reaction time, varied catalyst concentration)
[0031]In 50mL ethanol system, add 1mL water, then add 1mL 0.027mol / L, 1mL 0.055mol / L, 1mL 0.11mol / L and 1mL 0.16mol / L TMAH aqueous solution respectively, after the reaction temperature is constant at 25℃, add 1.25 mLTEOS was stirred for 3 hours at a constant temperature of 25°C. After the reaction, centrifuge to remove the supernatant, and then wash with water again, disperse the particles in 30mL pure water, and prepare solid SiO with good monodispersity of about 60nm, 110nm, 150nm, and 200nm respectively. 2 Nanoparticles.
Embodiment 3
[0032] Example 3: Hollow structure SiO with different particle sizes and shell thicknesses 2 Preparation of nanoparticles
[0033] The 60nm solid SiO prepared in embodiment 2 2 Nanoparticles, after being put into 30mL pure water, under the condition of pH 8, heated and incubated at 40°C for 1 hour, a hollow structure SiO with a particle size of about 60nm and a shell thickness of 10nm can be prepared. 2 Nanoparticles;
[0034] The 110nm solid SiO prepared in embodiment 2 2 Nanoparticles, after being put into 30mL pure water, under the condition of pH 9, heated and incubated at 50°C for 3 hours, a hollow structure SiO with a particle size of about 110nm and a shell thickness of 20nm can be prepared. 2 Nanoparticles;
[0035] The 150nm solid SiO prepared by embodiment 2 2 Nanoparticles, after being put into 30mL pure water, under the condition of pH 10, heated and incubated at 90°C for 3 hours, a hollow structure SiO with a particle size of about 150nm and a shell thickness...
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