A controllable aspect ratio and channel-functionalized silica nanorod and preparation method thereof
A technology of silica and aspect ratio, applied in the direction of silica, silica, chemical instruments and methods, etc., can solve the problems of cumbersome process and the inability to fully utilize the high specific surface of mesoporous silica, and achieve The effect of simple synthesis steps, good porosity, and large specific surface area
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Embodiment 1
[0044] Add 0.652g of surfactant cetyltrimethylammonium bromide to 315mL of water, stir to fully dissolve the surfactant in the water; then add 12.45mL of 28% concentrated ammonia water to the solution, stir for 1h to form a colorless and transparent Solution A; then, a mixed solution B of 1.8 mL of ethyl orthosilicate and 0.9 mL of 3-aminopropyltriethoxysilane (APTES) was added dropwise to solution A at a rate of 23 mL / h, and stirred at 25°C 4h. The obtained product solution was centrifuged to collect the solid, washed with water and centrifuged to neutrality, then the obtained solid product was added to 1 g / L ammonium nitrate-ethanol solution for reflux, repeated the reflux step, and the solid product was collected by centrifugation. -NH 2group of silica nanorods with L=980nm, D=980nm, AR=1, specific surface=1145.3m 2 / g, see the SEM image figure 1 , and its infrared spectrum can be seen in Figure 5 .
Embodiment 2
[0046] Add 0.873g of surfactant cetyltrimethylammonium chloride to 210mL of water, stir to fully dissolve the surfactant in the water; then add 8.3mL of 28% concentrated ammonia water to the solution, stir for 1h to form colorless and transparent solution; then a mixed solution of 2.5 mL of ethyl orthosilicate and 1.25 mL of 3-aminopropyltriethoxysilane (APTES) was added dropwise to the solution at a rate of 23 mL / h, and stirred at 5° C. for 120 h. The obtained product solution was centrifuged to collect the solids, washed with water and centrifuged to neutrality, then the obtained solids were added to 6g / L ammonium nitrate-methanol solution for reflux, the refluxing step was repeated, the solid products were collected by centrifugation, washed and dried to obtain a -NH 2 group of silica nanorods with L=695nm, D=371nm, AR=1.9, specific surface=851.2m 2 / g.
Embodiment 3
[0048] Add 0.873g of surfactant octadecyltrimethylammonium bromide to 210mL of water, stir to fully dissolve the surfactant in the water; then add 8.3mL of 28% concentrated ammonia into the solution, stir for 1h to form colorless and transparent solution; then a mixed solution of 2.5 mL of ethyl orthosilicate and 1.25 mL of 3-chloropropyltrimethoxysilane was added dropwise to the solution at a rate of 30 mL / h, and stirred at 25° C. for 4 h. The obtained product solution was centrifuged to collect the solid, washed with water and centrifuged to neutrality, then the obtained solid product was added to 2 g / L ammonium nitrate-ethanol solution for reflux, the reflux step was repeated, the solid product was collected by centrifugation, washed and dried to obtain a Silica nanorods with chloropropyl group, L=658nm, D=319nm, AR=2, specific surface area=911.4m 2 / g.
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