Composite nano-material with nano-particles wrapped by meso-porous silica, and preparation method and application thereof

Abstract

The invention provides a composite nano-material with nano-particles wrapped by meso-porous silica, and a preparation method and an application thereof. The preparation method comprises the followingsteps: firstly, dispersing nano-particles into an ethanol-water solution, adding ammonium hydroxide to adjust the pH value, dropwise adding an ethanol-water solution of hexadecyltrimethylammonium bromide under the ultrasonic action, continuing ultrasonic treatment, dropwise adding tetraethoxysilane, and purifying to obtain the composite nano material which takes meso-porous silica as a shell and nano-particles as a core and is uniform, stable and controllable in size. Binuclear or trinuclear nanoparticles of different types / functions can be embedded into the same meso-porous silica shell to realize multi-core wrapping, the method is universal, can be expanded to wrapping of more different nano-particles, is green and efficient in preparation process, can be carried out at room temperature,and is hydrophilic in used solvent, low in cost and simple in process, the particle size of the obtained composite nano-material is as low as 50 nm, and the composite nano-material with different sizes can be obtained by adjusting the proportion of used reagents.

Description

technical field [0001] The invention relates to a composite nanomaterial using mesoporous silicon dioxide to wrap nanoparticles, a preparation method and application thereof, and is suitable for technical fields such as medicine, energy catalyst, and environmental pollution control. Background technique [0002] Nanomaterials have broad application prospects due to their unique physical and chemical properties, but many practical applications are limited due to the difficulty in controlling their stability. Mesoporous silica materials have uniform morphology, adjustable pore channels, high pore volume and specific surface area, good biocompatibility and degradability, and easy surface modification, which is a carrier with great application potential. At present, many researchers use mesoporous silica material (shell) to wrap different nanoparticles (core) to solve the problem of nanomaterial stability. [0003] However, the current mesoporous silica materials to wrap nanopa...

AI Technical Summary

Problems solved by technology

[0004] (1) Only one kind of nanoparticles can be wrapped;

[0005] (2) General experiments need to be carried out at high temperature, and the steps are cumbersome;

[0006] (3) Most of the experiments involve non-polar (hydrophobic) solvents, such as chloroform, dichlorobenzene, etc., which limit many applications of materials, such as medicine, environmental protection, etc.;

[0007] (4) The stability of the nanoparticles after wrapping is still not high;

[0008] (5) The particle size of the prepared mesoporous silica nanoparticles is uncontrollable, and the fluctuation range is too large;

[0009] (6) In some experiments, the surface of nanoparticles is coated first, and then the core-shell material is prepared by wrapping with mesoporous silica. Although the stability of nanoparticles is improved, the multi-layer wrapping makes the nanoparticles Specific surface effect / activity reduced

Images