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Method for preparing SiO2/TiO2 composite powder

A composite powder and volume technology, applied in the field of nanomaterials, can solve the problems of difficult separation and control of products, easy agglomeration and growth of primary particles, and high cost, and achieve the effects of shortening the preparation cycle, shortening the process time, and complete the shape

Inactive Publication Date: 2010-11-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chemical vapor deposition method has the advantages of short cycle and low cost, its SiO 2 / TiO 2 Composite material particles have disadvantages such as wide particle size distribution, uneven particle size distribution, difficult control of Si / Ti ratio, and difficulty in mixing components uniformly, resulting in uneven chemical composition of the product.
The disadvantages of the traditional sol-gel method are high cost, high processing temperature, and easy agglomeration of primary particles.
Co-precipitation method has low production efficiency, the product is not easy to separate and control, and there are many impurities

Method used

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  • Method for preparing SiO2/TiO2 composite powder

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A SiO 2 / TiO 2 The preparation method of composite powder comprises the following steps:

[0027] 1) Dissolve 10ml tetraethyl orthosilicate in 120ml (part a) of absolute ethanol to form solution A, and dissolve ammonia water (volume concentration 25%) twice the volume of tetraethyl orthosilicate in 80ml (part b) of Dehydrated alcohol is configured into solution B, in terms of mass ratio, tetraethyl orthosilicate / (a+b part of dehydrated alcohol+ammonia)=5:96;

[0028] Put solution A in the ultrasonic equipment, set the power to 100W, the frequency to 40KHz, and the temperature to 30°C, add solution B to solution A under ultrasonication, and then continue ultrasonication for 1h; after the ultrasonication is completed, separate and mix The precipitate generated in the solution, the precipitate was washed with water and absolute ethanol, and then dried at 60°C to obtain SiO with a particle size of 100-400nm 2 submicron spheres;

[0029] 2) Dissolve 192.14g (1mol) of cit...

Embodiment 2

[0034] A SiO 2 / TiO 2 The preparation method of composite powder comprises the following steps:

[0035] 1) Dissolve 10ml tetraethyl orthosilicate in 145ml (part a) of absolute ethanol to form solution A, and dissolve ammonia (volume concentration 28%) that is 8 times the volume of tetraethyl orthosilicate in 112ml (part b) of Dehydrated alcohol is configured into solution B, in terms of mass ratio, tetraethyl orthosilicate / (a+b part of dehydrated alcohol+ammonia)=3:90;

[0036] Put solution A in the ultrasonic equipment, set the power to 80W, set the temperature to 40°C, and set the frequency to 30KHz, add solution B to solution A under ultrasonication, and then continue ultrasonication for 2h; after the ultrasonication is completed, separate and mix The precipitate generated in the solution was washed with water and absolute ethanol and dried at 80°C to obtain SiO 2 submicron spheres;

[0037]2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volu...

Embodiment 3

[0041] A SiO 2 / TiO 2 The preparation method of composite powder comprises the following steps:

[0042] 1) Dissolve 10ml tetraethyl orthosilicate in 120ml (part a) of absolute ethanol to form solution A, and dissolve 6 times the volume of tetraethyl orthosilicate in ammonia (volume concentration 25%) in 120ml (part b) of Dehydrated alcohol is configured into solution B, in terms of mass ratio, tetraethyl orthosilicate / (dehydrated alcohol+ammonia water of a+b part)=3.5:93;

[0043] Put solution A in the ultrasonic equipment, set the power to 85W, set the temperature to 38°C, and set the frequency to 35KHz, add solution B to solution A under ultrasonication, and then continue ultrasonication for 1h; after the ultrasonication is completed, separate and mix The precipitate formed in the solution was washed with water and absolute ethanol and dried at 70°C to obtain SiO 2 submicron spheres;

[0044] 2) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a vol...

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Abstract

The invention discloses a method for preparing SiO2 / TiO2 composite powder, which comprises the following steps of: dissolving tetraethoxysilane and ammonia water in absolute ethyl alcohol respectively, mixing the tetraethoxysilane and the ammonia water at one time under the ultrasonic condition, continuously performing ultrasonic separation and precipitation to obtain SiO2 submicron spheres with uniform particles and complete appearance; adding the SiO2 submicron spheres into tetrabutyl titanate sol C taking the ammonia water as a solvent, citric acid as a complexing agent and polyethylene glycol as a dispersing agent, performing sufficient ultrasonic dispersion, and stirring and heating to obtain wet gel; and further drying and foaming to compound SiO2 and TiO2 constantly, and calcining to obtain the SiO2 / TiO2 composite powder. The method disclosed by the invention has short preparation period; and the prepared SiO2 / TiO2 composite powder is complete spheres of which the particle size is 200 to 600nm and has high purity and yield.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and relates to a SiO 2 / TiO 2 Preparation method of composite powder. Background technique [0002] SiO 2 / TiO 2 Composite material is a non-toxic, non-polluting inorganic non-metallic material, which has high surface activity, good insulation and dielectric properties, strong ability to shield ultraviolet rays and excellent transparency, and is mainly used for catalytic , gas sensors, optoelectronic devices, etc., are widely used in cosmetics, coatings, pigments, photocatalysts and other fields. [0003] Current SiO 2 / TiO 2 The preparation methods of composite materials include sol-gel method, co-precipitation method, chemical vapor deposition and so on. Although the chemical vapor deposition method has the advantages of short cycle and low cost, its SiO 2 / TiO 2 Composite particles have disadvantages such as wide particle size distribution, inhomogeneity, difficulty in cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01G23/053
Inventor 伍媛婷王秀峰
Owner SHAANXI UNIV OF SCI & TECH
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