Novel green single-dispersed silica nanoparticle preparation method

Abstract

The invention provides a novel green single-dispersed silica nanoparticle preparation method. The method includes: preparing an O / W-type water / ethanol / dichloromethane surfactant-free microemulsion; completely dissolving tetraethoxysilane (TEOS) in a spherical 'oil core' of the O / W-type water / ethanol / dichloromethane surfactant-free microemulsion prepared in the first step under the action of ultrasound and agitation, subjecting the TEOS to hydrolytic polycondensation and performing centrifugal separation after reaction; washing solid components with a polar solvent for multiple times to obtain single-dispersed SiO2 nanoparticles, and distilling remaining liquid components to collect ethanol and dichloromethane. The method is simple in operation, low in cost, environment friendly, reusable in system and high in efficiency; the prepared SiO2 nanoparticles are uniform in size, and universality and scale productive values are achieved; the method is simple in step, convenient in operation and high in practicability.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and in particular relates to a preparation method of a novel green monodisperse silica nanosphere. Background technique [0002] Monodisperse SiO 2 Nanospheres have important application value in biomedicine, catalysis, functional materials, high-performance ceramics, coatings and other fields due to their large specific surface area, good dispersibility, and good optical and mechanical properties. method is currently used to prepare SiO 2 One of the commonly used methods for nanospheres, this method has the advantages of simple operation and clean surface of the prepared silica nanospheres. This method only uses the interaction between solvents and does not contain a preparation template, so the controllability and repeatability of the preparation of silica nanospheres are poor, and it is difficult to obtain high-quality SiO 2 Nanospheres. Another preparation of SiO 2 The commonly used method ...

AI Technical Summary

Problems solved by technology

This method only utilizes the interaction between solvents and does not contain a preparation template, so the controllability and repeatability of preparing silica nanospheres are poor, and it is difficult to obtain high-quality SiO 2 nanosphere

Another preparation of SiO 2 The commonly used method of nanospheres is the microemulsion method, and the SiO prepared by this method 2 Nanospheres have good monodispersity and adjustable size, but when constructing microemulsion templates, a large amount of surfactants and co-surfactants need to be consumed, and these two components are partially dissolved in addition to entering the interface film of microemulsions. In the water phase and oil phase, it is not easy to recycle, and it will pollute the environment, and the surface active agent loaded on the surface of the material is difficult to wash and remove, which affects its purity. These problems have seriously restricted the microemulsion method in the preparation of silica nanoparticles. Aspects of application

Images