Micron-sized monodispersed porous silica microsphere and preparation method thereof
A technology of porous silicon dioxide and silicon dioxide, applied in the directions of silicon dioxide, silicon oxide, nanotechnology, etc., can solve problems such as application field limitations, and achieve low cost of raw materials, adjustable particle size and pore structure, and acceptable conditions. Strong control effect
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[0023] Example 1
[0024] Preparation of silica microspheres using polymethylsilsesquioxane microspheres as template
[0025] (1) Add 20 g of methyltrimethoxysilane to 100 mL of deionized water, add 0 μL of pH 1 hydrochloric acid solution, and stir and react for 1 hour at room temperature to obtain a polysilsesquioxane hydrolysate;
[0026] (2) Add 10 μL of concentrated ammonia to the polysilsesquioxane hydrolysate, stir well, let stand for 4 hours, filter to remove the mother liquor, collect the microspheres, wash with 95% ethanol to obtain polysilsesquioxane gel micro ball;
[0027] (3) Disperse 1 g of polysilsesquioxane gel microspheres in 10 mL of 80% ethanol at a mass-to-volume ratio of 0.1, and mix;
[0028] (4) Add sodium hydroxide to the mixed solution obtained in step (3) to make the concentration 0.05M, mix well, shake in a 70℃ water bath for 10 hours, filter to remove the solvent, and wash the microspheres alternately with 95% ethanol and water. Until the filtrate is neutra...
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[0031] Example 2
[0032] Preparation of silica microspheres with different pore diameters using polymethylsilsesquioxane microspheres as templates
[0033] (1) Add 20 g of methyltrimethoxysilane to 100 mL of deionized water, add 0 μL of pH 1 hydrochloric acid solution, and stir and react for 1 hour at room temperature to obtain a polysilsesquioxane hydrolysate;
[0034] (2) Add 10 μL of concentrated ammonia to the polysilsesquioxane hydrolysate, stir well, let stand for 4 hours, filter to remove the mother liquor, collect the microspheres, wash with 95% ethanol to obtain polysilsesquioxane gel micro ball;
[0035] (3) Disperse 1 g of polysilsesquioxane gel microspheres in 10 mL of 80% ethanol at a mass-to-volume ratio of 0.1, and mix;
[0036] (4) Add sodium hydroxide to the mixed solution obtained in step (3) to make the concentration of 0.01 and 0.025M respectively, mix well, shake in a 70℃ water bath for 10h, filter to remove the solvent, and use 95% ethanol and water for the micro...
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[0041] Example 3
[0042] Preparation of silica microspheres with different particle diameters using polymethylsilsesquioxane microspheres as templates
[0043] (1) Add 20 g of methyltrimethoxysilane to 100 mL of deionized water, add 0 μL of pH 1 hydrochloric acid solution, and stir and react for 1 hour at room temperature to obtain a polysilsesquioxane hydrolysate;
[0044] (2) Add 5, 20, and 50 μL of concentrated ammonia to the polysilsesquioxane hydrolysate, stir well, and let stand for 4, 3, and 2 hours respectively, filter to remove the mother liquor, collect the microspheres, and wash with 95% ethanol. Obtaining polysilsesquioxane gel microspheres of different particle sizes;
[0045] (3) Disperse 1 g of polysilsesquioxane gel microspheres in 10 mL of 80% ethanol at a mass-to-volume ratio of 0.1, and mix;
[0046] (4) Add sodium hydroxide to the mixed solution obtained in step (3) to make the concentration respectively 0.05, 0.1, 0.6M, mix well, shake in a water bath at 70℃ for 1...
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