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Method for preparing porous balls of strontium titanate

A porous ball, strontium titanate technology, applied in chemical instruments and methods, titanium compounds, inorganic chemistry and other directions, can solve the problems of agglomeration, difficult to control particle size and morphology, low powder purity, etc., to achieve simple equipment and process. The conditions are easy to control and the crystal stability is good.

Inactive Publication Date: 2007-12-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional method of preparing strontium titanate is the solid phase reaction method. Although the process is simple, the powder prepared by this method is low in purity, and because it requires a high temperature calcination process, it is easy to cause very serious agglomeration and it is difficult to control the particles. size and shape

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  • Method for preparing porous balls of strontium titanate
  • Method for preparing porous balls of strontium titanate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1) Dissolve tetrabutyl titanate in absolute ethanol to adjust the Ti in the solution 4+ The ion concentration is 0.5mol / L;

[0022] 2) Under stirring, add 2ml of 30wt% ammonia solution to the ethanol solution of tetrabutyl titanate, precipitate, filter, and wash with deionized water for 6 times to obtain a precipitate of titanium oxyhydroxide;

[0023] 3) Strontium nitrate is dissolved in deionized water to adjust the Sr in the solution 2+ The ion concentration is 1.5mol / L;

[0024] 4) Potassium hydroxide and polyvinyl alcohol were dissolved in deionized water respectively to obtain a potassium hydroxide solution with a concentration of 2mol / L and a polyvinyl alcohol solution with a concentration of 16g / L;

[0025] 5) Precipitate titanium oxyhydroxide, add strontium nitrate aqueous solution, potassium hydroxide aqueous solution and polyvinyl alcohol aqueous solution to the inner tank of the reactor, and use deionized water to adjust the reaction materials in the inner...

Embodiment 2

[0028] 1) Dissolve tetrabutyl titanate in absolute ethanol to adjust the Ti in the solution 4+ The ion concentration is 0.5mol / L;

[0029] 2) In the stirring state, add 2ml of 30wt% ammonia solution to the ethanol solution of tetrabutyl titanate, precipitate, filter, and wash with deionized water for 6 times to obtain the precipitate of titanium oxyhydroxide;

[0030] 3) Strontium nitrate is dissolved in deionized water to adjust the Sr in the solution 2+ The ion concentration is 3.0mol / L;

[0031] 4) Potassium hydroxide and polyvinyl alcohol were dissolved in deionized water respectively to obtain a potassium hydroxide solution with a concentration of 2mol / L and a polyvinyl alcohol solution with a concentration of 16g / L;

[0032] 5) Precipitate titanium oxyhydroxide, add strontium nitrate aqueous solution, potassium hydroxide aqueous solution and polyvinyl alcohol aqueous solution to the inner tank of the reactor, and use deionized water to adjust the reaction materials in ...

Embodiment 3

[0035] 1) Dissolve tetrabutyl titanate in absolute ethanol to adjust the Ti in the solution 4+ The ion concentration is 1.0mol / L;

[0036] 2) Under stirring, add 3ml of 30wt% ammonia solution to the ethanol solution of tetrabutyl titanate, precipitate, filter, and wash with deionized water for 6 times to obtain titanium oxyhydroxide precipitate;

[0037] 3) Strontium nitrate is dissolved in deionized water to adjust the Sr in the solution 2+ The ion concentration is 3.0mol / L;

[0038] 4) Potassium hydroxide and polyvinyl alcohol were dissolved in deionized water respectively to obtain a potassium hydroxide solution with a concentration of 5 mol / L and a polyvinyl alcohol solution with a concentration of 4 g / L;

[0039] 5) Precipitate titanium oxyhydroxide, add strontium nitrate aqueous solution, potassium hydroxide aqueous solution and polyvinyl alcohol aqueous solution to the inner tank of the reactor, and use deionized water to adjust the reaction materials in the inner tan...

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Abstract

This invention discloses a method for preparing porous strontium titanate spheres. The method comprises: preparing titanium oxyhydroxide precipitate and deionized water solution of strontium as the reactants, adding KOH with an appropriate concentration to promote crystallization, adding poly(vinyl alcohol) surfactant with an appropriate concentration to control the morphology, and performing hydrothermal reaction at 150-200 deg.C to obtain monodispersed porous strontium titanate spheres. The method has such advantages as simple process, easy control of pore size and specific surface area, no pollution and low cost, and is suitable for mass production. The obtained porous strontium titanate spheres have such advantages as stable crystal quality, high powder dispersibility and large specific surface area, and can be used in microelectronics, catalysts, solar cells, sensors and luminescent materials.

Description

technical field [0001] The invention relates to a method for preparing strontium titanate porous balls, belonging to the field of inorganic non-metallic materials. Background technique [0002] Strontium titanate is a very important ABO 3 type perovskite complex oxide, due to its excellent dielectric properties, semiconductivity, temperature stability and high voltage resistance, strontium titanate has become an important inorganic material for the preparation of multifunctional electronic ceramics. At the same time, strontium titanate has the same band gap (3.2eV) as titanium dioxide. In recent years, it has attracted extensive research interest in the fields of photocatalysis, solar cell photoelectrodes, sensors, and luminescence. Due to its unique structure, porous materials are widely used in separation, catalysis and other fields. Porous strontium titanate has a large specific surface area, which is expected to improve the performance of related aspects. [0003] The...

Claims

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Application Information

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IPC IPC(8): C01G23/00C04B35/47
Inventor 韩高荣魏晓徐刚翁文剑杜丕一赵高凌张溪文沈鸽
Owner ZHEJIANG UNIV
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