Method for preparing functional modified hollow mesoporous or core/shell mesoporous silicon dioxide nanometer granules
A nanoparticle and gold nanoparticle technology, applied in the field of nanomaterials, can solve the problems of cumbersome process and difficult adjustment of the particle size of gold nanoparticles.
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[0040] Example 1
[0041] Preparation of amino functionalized hollow mesoporous SiO 2 Ball: Mix 71.6 mL of absolute ethanol, 10 mL of deionized water and 3.14 mL of ammonia water, and stir at 30°C for 30 min; quickly add 6 mL of ethyl orthosilicate and stir magnetically for 40 min; add 5 mL of orthosilicic acid After the ethyl ester and 2 mL of 3-aminopropyltrimethoxysilane are evenly mixed, the above solution is quickly added, and the solution is stirred magnetically for 80 min. After the product is centrifuged, a highly dispersed homogeneous solid core / shell mesoporous SiO is obtained 2 Nanosphere. The product after centrifugation disperses 0.6 mol / L Na 2 CO 3 In solution. Stir the dispersed sol at 80°C for 30 min. After centrifugation, the product was washed 3 times with deionized water and freeze-dried.
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[0042] Example 2
[0043] According to the synthesis process of Example 1, the homogeneous solid core / shell mesoporous SiO was first obtained 2 Nanosphere. The product after centrifugation is dispersed in 0.6 mol / L Na 2 CO 3 In solution and treated at 80°C for 8 min. The subsequent processing is as in Example 1. Preparation of homogeneous core / shell mesoporous SiO with enlarged pore diameter of hybrid shell 2 Nano particles.
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[0044] Example 3
[0045] According to the synthesis process of Example 1, 60 ml of absolute ethanol, 20 ml of ammonia (28wt%) were stirred and mixed uniformly at 30°C, 20 ml of a mixture of TEOS and absolute ethanol in a volume ratio of 18:2 was added, and reacted for 20 min. Add 4 ml TEOS and 19:1 volume ratio of absolute ethanol and N-[3-(trimethoxysilyl) propyl] ethylenediamine N-[3-(trimethoxysilyl) propyl respectively. ] Ethylenediamine mixture, react for 2h, and the product will be centrifuged to obtain highly dispersed homogeneous solid core / shell mesoporous SiO 2 Nanosphere. How to prepare hollow mesoporous SiO functionalized with long-chain amino groups 2 The subsequent processing of nanomaterials is as in Example 1; if the homogeneous core / shell mesoporous SiO functionalized with long-chain amino groups is prepared 2 Nanoparticle materials, the subsequent processing is as in Example 2.
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