Preparation method of novel and green mono-dispersive silicon dioxide nanospheres

Abstract

The invention provides a preparation method of novel and green mono-dispersive silicon dioxide nanospheres. The preparation method comprises the following steps: preparing a O / W water / ethanol / dichloromethane microemulsion with a surfactant; fully dissolving TEOS under action of ultrasonic treatment and stirring in spherical oil kernels of the O / W water / ethanol / dichloromethane microemulsion with the surfactant; then under catalysis of ammonia water, carrying out hydrolytic polycondensation on TEOS; after reaction, carrying out centrifugal separation; and washing a solid component with a polar solvent for many times to obtain the mono-dispersive silicon dioxide nanospheres, and distilling the residual liquid component to collect ethanol and dichloromethane. According to the method, the operation is simple, the cost is low, an environment-friendly effect is achieved, the system can be used repeatedly, and the efficiency is high. The prepared SiO2 nanospheres are uniform in dimension, andhave universality and scaled production value. The preparation method is simple in step, convenient to operate and high in practicality.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a method for preparing novel green monodisperse silica nanospheres. Background technique [0002] monodisperse SiO 2 Nanospheres, due to their large specific surface area, good dispersion, and good optical and mechanical properties, have important application values ​​in the fields of biomedicine, catalysis, functional materials, high-performance ceramics, and coatings. The current method is to prepare SiO 2 One of the commonly used methods for nanospheres, the method has the advantages of simple operation and clean surface of the prepared silica nanospheres. However, this method only utilizes the interaction between solvents and does not prepare templates, so the controllability and repeatability of preparing silica nanospheres are poor, and it is difficult to obtain high-quality SiO 2 nanospheres. Another preparation of SiO 2 A common method for nanospheres is the micro...

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Problems solved by technology

However, this method only utilizes the interaction between solvents and does not prepare templates, 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 A common method for 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. In addition to entering the interface film of microemulsions, these two components also partially dissolve 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 the purity of the material. These problems have seriously restricted the microemulsion method in the preparation of silica nanoparticles. Promotion and application of materials

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