A kind of preparation method of nano silicon dioxide

A technology of nano-silica and ethyl silicate, which is applied in the direction of silica, silicon oxide, nanotechnology, etc., can solve the problems of organic solvent increase and doping, and achieve less impurity content, less environmental pollution, and simple operation Effect

Active Publication Date: 2017-04-26
HUNAN ER KANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current patents on the use of sol-gel technology to prepare nano-silica, in order to prevent the agglomeration of the prepared silica, it is necessary to add a dispersant to obtain the required nano-silica, which will inevitably cause problems in the prepared silica. Silica is mixed with certain impurities, and in order to dissolve these dispersants, the amount of organic solvent will increase relatively

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve ethyl silicate in a solvent with a volume ratio of ethanol and water of 1:9 so that the concentration of ethyl silicate is 0.1mol / L, then add sulfuric acid solution at a stirring rate of 500r / min to adjust the pH to 3, When the size of the silica particles to be formed is 1nm, put a cellulose mesh into the solution for 40 minutes at a distance of 0.5cm, take it out, collect the solid, wash and dry to obtain nano-silica. The particle size range of the obtained nano-silica is 0.5-15nm, and 92.3% of the silicon dioxide has a particle size between 1-5nm.

Embodiment 2

[0025] Dissolve ethyl silicate in a solvent with a volume ratio of ethanol and water of 1.3:9 so that the concentration of ethyl silicate is 5mol / L, then add sulfuric acid solution at a stirring rate of 800r / min to adjust the pH to 5, and wait When the size of the formed silica particles is 10nm, put a cellulose mesh into the solution for 60 minutes at a distance of 0.8cm, take it out, collect the solid, wash and dry to obtain nano-silica. The particle size range of the obtained nano silicon dioxide is 5-50nm, wherein 94.1% of the silicon dioxide has a particle size between 10-15nm.

Embodiment 3

[0027] Dissolve ethyl silicate in a solvent with a volume ratio of ethanol and water of 1.5:9 so that the concentration of ethyl silicate is 2.2mol / L, then add sulfuric acid solution at a stirring rate of 632r / min to adjust the pH to 3.3, When the size of the silica particles to be formed is 5nm, put a cellulose mesh into the solution at a distance of 0.6cm for 45 minutes, take it out, collect the solid, wash and dry to obtain nano-silica. The particle size range of the obtained nano silicon dioxide is 1-30nm, wherein 96.1% of the silicon dioxide has a particle size between 5-10nm.

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Abstract

The invention discloses a preparation method of nano silicon dioxide. On the basis of the existing sol-gel technology, after dissolving ethyl silicate in organic solvent and water, the sol is prepared by controlling the pH, temperature and stirring speed of the solution, when the sol particle range is within 1-10nm Finally, the stencils with hydroxyl groups are vertically put into the solution at a certain interval, and then taken out and washed with water at the same time after a certain interval to obtain nano-silica. The preparation method obtains less impurity content in the nano silicon dioxide, avoids the use of a dispersant, and uses less organic solvent in the preparation process, and the preparation method is simple to operate and greatly shortens the coagulation time.

Description

technical field [0001] The preparation of nano silicon dioxide belongs to the preparation technology of inorganic nano materials, and specifically relates to a method for preparing nano silicon dioxide on the basis of sol-gel technology with ethyl silicate as a silicon source. Background technique [0002] Nano silica is amorphous white powder, which is a non-toxic, odorless and non-polluting non-metallic functional material. Nano silica has small size effect, surface interface effect, quantum size effect and macro quantum tunnel effect and special Optical and electrical properties, high magnetoresistance, non-linear resistance, and high strength, high toughness, and good stability at high temperatures, nano-silica can be widely used as catalyst carriers, separators, and adsorbents and chemical biosensing materials. [0003] At present, there are many patents for preparing nano-silica on the basis of sol-gel technology, such as CN101891209A, which uses citric acid, tetraeth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18B82Y30/00
Inventor 帅放文王向峰章家伟
Owner HUNAN ER KANG PHARMA
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