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Hydrangea-like strontium titanate nano powder preparation method

A technology of nano-powder and hydrangea, which is applied in the direction of titanate, nanotechnology, alkaline earth metal titanate, etc., can solve the problems of troublesome product cleaning and great influence on use, and achieve high purity and crystallinity, dispersibility and Good particle size uniformity, convenient cleaning and post-application effects

Active Publication Date: 2016-04-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of porous strontium titanate nanopowders requires the assistance of modifiers, such as sodium silicate, PVA, etc. The products obtained in this way are troublesome to clean and have a great impact on later use.

Method used

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Examples

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Embodiment 1

[0018] 1) Dissolve 5mmol tetrabutyl titanate in 3mL ethylene glycol methyl ether, add ammonia water dropwise under stirring to form a gel, wash the resulting gel with deionized water until neutral, and obtain a titanium precursor Gel; dissolve 5mmol strontium nitrate in 10mL deionized water, stir and mix with the titanium precursor gel to obtain a suspension;

[0019] 2) Add 10 mL of an aqueous solution in which 0.107 mol of potassium hydroxide is dissolved in the suspension obtained in step 1), and stir to obtain a uniform suspension;

[0020] 3) Add the suspension in step 2) into the inner tank of the reactor, adjust the liquid volume in the inner tank of the reactor with deionized water to 7 / 8 of the volume of the inner tank, place the inner tank of the reactor in the reactor, and After being kept at 140° C. for 10 h, it was naturally cooled to room temperature, and the obtained product was washed with deionized water until neutral, then washed with absolute ethanol, and dr...

Embodiment 2

[0022] 1) Dissolve 5mmol tetrabutyl titanate in 2mL ethylene glycol methyl ether, add ammonia water dropwise under stirring to form a gel, wash the resulting gel with deionized water until neutral, and obtain a titanium precursor Gel; dissolve 5mmol strontium nitrate in 10mL deionized water, stir and mix with the titanium precursor gel to obtain a suspension;

[0023] 2) Add 10 mL of an aqueous solution in which 0.071 mol of potassium hydroxide is dissolved in the suspension obtained in step 1), and stir to obtain a uniform suspension;

[0024] 3) Add the suspension in step 2) into the inner tank of the reactor, adjust the liquid volume in the inner tank of the reactor with deionized water to 4 / 5 of the volume of the inner tank, place the inner tank of the reactor in the reactor, and After being kept at 140° C. for 10 h, it was naturally cooled to room temperature, and the obtained product was washed with deionized water until neutral, then washed with absolute ethanol, and dr...

Embodiment 3

[0026] 1) Dissolve 5 mmol tetrabutyl titanate in 2.5 mL ethylene glycol methyl ether, add ammonia water dropwise under stirring to form a gel, wash the resulting gel with deionized water until neutral, and obtain a titanium precursor body gel; dissolve 5mmol strontium nitrate in 10mL deionized water, stir and mix with the titanium precursor gel to obtain a suspension;

[0027] 2) Add 10 mL of an aqueous solution dissolved with 0.143 mol of potassium hydroxide to the suspension obtained in step 1), and stir to obtain a uniform suspension;

[0028] 3) Add the suspension in step 2) into the inner tank of the reactor, adjust the liquid volume in the inner tank of the reactor with deionized water to 4 / 5 of the volume of the inner tank, place the inner tank of the reactor in the reactor, and After being kept at 140° C. for 10 h, it was naturally cooled to room temperature, and the obtained product was washed with deionized water until neutral, then washed with absolute ethanol, and ...

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Abstract

The present invention relates to a hydrangea-like strontium titanate nano powder preparation method, hydrangea-like strontium titanate nano powder with a gullied surface can be prepared by a hydrothermal method without an auxiliary modifier, and the hydrangea diameter is 150-1100nm. The hydrangea-like strontium titanate nano powder with a large specific surface area can be prepared only by regulation of concentration of mineralizing agent potassium hydroxide without use of the auxiliary modifier in the preparation process, in particular, no modifier is involved in the reaction, the product is easy in washing and post-application, and simple in preparation and operation, and the obtained product has higher purity and crystallinity and good dispersion and particle size uniformity.

Description

technical field [0001] The invention relates to a method for preparing a hydrangea-like strontium titanate nanopowder, which belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Strontium titanate has a tetragonal perovskite structure with good stability and element tunability. Since its valence band and conduction band are located on both sides of the oxygen and hydrogen potentials, it is regarded as a promising material for photo-splitting water, and has received extensive attention in the field of photo-splitting water in recent years. At the same time, the importance of strontium to human health has also been paid attention to. In view of the stability requirements, strontium titanate is regarded as a good slow-release material and drug carrier. To sum up, in the above two fields, it is necessary for the material to have a larger specific surface area to improve the efficiency. Therefore, it is necessary to study the preparat...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y40/00
CPCC01G23/006C01P2002/72C01P2004/03C01P2004/04C01P2004/64C01P2006/12
Inventor 任召辉陈芳韩高荣沈鸽
Owner ZHEJIANG UNIV
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