Mesoporous silica wrapped nanoparticle composite material, preparation method thereof, and use thereof
The present disclosure relates to mesoporous silica wrapped nanoparticle composite nanomaterial, preparation method thereof, and use thereof. In the present disclosure, a nanoparticle is dispersed in an aqueous ethanol solution. Then, ammonia water is added to adjust the pH. After that, cetyltrimethylammonium bromide in an aqueous ethanol solution is added dropwise, and ultrasound is continued, before tetraethyl orthosilicate is added dropwise. The mixture is purified to produce a composite nanomaterial that is stable, controllable, and consistent in size; the shell of the composite nanomaterial is mesoporous silica, the core of the composite nanomaterial is a nanoparticle. Dual-core or triple-core nanoparticles of different kinds/functions can be wrapped into a single mesoporous silica shell to achieve multi-core wrapping. The method is universal and may be used to wrap various nanometers. The preparation procedure is environmentally friendly, efficient, and may be carried out at room temperature.
1 . A method for preparing a mesoporous silica wrapped nanoparticle composite nanomaterial, comprising the following procedures:
(1) dispersing a nanoparticle in an aqueous ethanol solution, then adding ammonia water and stirring thoroughly to obtain solution A; dissolving cetyltrimethylammonium bromide in an identical aqueous ethanol solution to obtain solution B;
(2) adding solution B dropwise to solution A under ultrasound, and then continue performing ultrasound to obtain solution C;
(3) adding tetraethyl orthosilicate dropwise to solution C, followed by consecutive stirring, solid-liquid separation and purification to obtain the composite nanomaterial;
wherein the nanoparticle has a particle size of 1-20 nm;
wherein in the aqueous ethanol solution, a volume ratio of ethanol to water is 1:3-4;
wherein solution A has a pH of 9-10;
wherein a ratio of mass of the cetyltrimethylammonium bromide to a specific surface area of the nanoparticle is 1 mg-3 mg: 10 14 nm 2 -10 17 nm 2 ; and
wherein in step (2), the ultrasound is continued for at least 30 minutes.
2 . The method according to claim 1 , wherein a volume ratio of solution B to solution A is 1:9.
3 . The method according to claim 1 , wherein in step (2), the cetyltrimethylammonium bromide has a concentration of 30 mg/mL in solution B.
4 . The method according to claim 1 , wherein in step (3), a ratio of the tetraethyl orthosilicate to the cetyltrimethylammonium bromide is 1 mL:5 g, the stirring is performed for 12 h.