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Preparation method of Bi12SiO20 porous material

A porous material and solution technology, applied in the field of materials, can solve the problems of short, complex, and long preparation period, and achieve the effects of simple equipment, uniform formation process, and good controllability of pore size and distribution.

Inactive Publication Date: 2016-09-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of preparing porous materials is mainly to use solid phase method, sol-gel method, precipitation method, etc. to synthesize powder, and then use foaming agent, binder, etc. to compound with powder, and prepare porous materials after forming. For bulk materials, the preparation period of these methods is long and complicated. This patent aims at the disadvantages of the current preparation methods for preparing porous materials, and has invented a short and effective Bi 12 SiO 20 Porous material preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Dissolve citric acid in ammonia water (volume concentration 25%-28%), the amount of ammonia water is subject to dissolving citric acid, measure 2 / 3 of citric acid solution, and dissolve ethyl orthosilicate in it Form solution A for later use; dissolve bismuth nitrate in the remaining citric acid solution to form solution B, where Si:Bi (molar ratio)=1:12, and the sum of Si ions and Bi ions: citric acid (molar ratio)=1: 0.4.

[0020] (2) Weigh a certain amount of dispersant (consisting of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol, and polyethylene glycol Glycol 400, polyethylene glycol 4000 and polyethylene glycol 6000) were added to solution B, the concentration of each component of the dispersant was controlled at 0.6 mol / L, and then anhydrous ethanol was added to stir to dissolve (the volume of anhydrous ethanol is ammonia 3 times the volume), add solution A to it under c...

Embodiment 2

[0024] (1) Dissolve citric acid in ammonia water (volume concentration 25%-28%), the amount of ammonia water is subject to dissolving citric acid, measure 2 / 3 of citric acid solution, and dissolve ethyl orthosilicate in it Form solution A for use; dissolve bismuth nitrate in the remaining citric acid solution to form solution B, where Si:Bi (molar ratio) = 1:9, and the sum of Si ions and Bi ions: citric acid (molar ratio) = 1:1.

[0025] (2) Weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, and polyethylene glycol) and add it to solution B. The concentration of the components is controlled at 0.6mol / L, then add absolute ethanol and stir to dissolve (the volume of absolute ethanol is twice the volume of ammonia), add solution A to it under constant stirring, and then adjust the pH to 1~3 The sol C is obtained.

[0026] (3) Put Sol C in a water bath at 80°C for 1 to...

Embodiment 3

[0029] (1) Dissolve citric acid in ammonia water (volume concentration 25%-28%), the amount of ammonia water is subject to dissolving citric acid, measure 2 / 3 of citric acid solution, and dissolve ethyl orthosilicate in it Form solution A for use; dissolve bismuth nitrate in the remaining citric acid solution to form solution B, where Si:Bi (molar ratio) = 1:10, and the sum of Si ions and Bi ions: citric acid (molar ratio) = 1: 0.8.

[0030] (2) Weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, and polyethylene glycol) into solution B. Each group of dispersant The concentration of the aliquots is controlled at 0.01, 0.1, 0.1, 0.5, 0.5, 0.6 mol / L, then add absolute ethanol and stir to dissolve (the volume of absolute ethanol is equal to the volume of ammonia), add solution A to it under constant stirring, then Adjust the pH value to 1 to 3 to obtain sol C.

[0031]...

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Abstract

The invention discloses a preparation method of a Bi12SiO20 porous material. The preparation method comprises the steps that silicon ions and bismuth ions and an organic substance form a complexing macromolecular structure through compounding of multiple dispersing agents, all the substances uniformly exist in xerogel, the xerogel achieves the appropriate viscosity by combining the reasonable compounding concentration, pressing molding is directly conducted on the xerogel, heat treatment is conducted, and then the Bi12SiO20 porous material can be obtained. The preparation method is simple in technology, short in cycle, simple in equipment and low in cost, and the obtained porous material is large in pore size and high in distribution controllability.

Description

Technical field [0001] The invention belongs to the technical field of materials, and particularly relates to a Bi 12 SiO 20 Preparation method of porous materials. Background technique [0002] Currently in Bi 2 O 3 -SiO 2 The compound crystal phases discovered and studied in the system mainly include Bi 12 SiO 20 Crystal, Bi 4 Si 3 O 12 Crystal and Bi 2 SiO 5 Crystal, the first two are stable compounds. Stable phase Bi 12 SiO 20 The crystal has the properties of piezoelectric, photoconductive, photorefractive, electro-optic, acousto-optic, and optical rotation. With its special structural characteristics, the porous material overcomes the problem of nano-powder agglomeration, and at the same time makes the material itself have more superior performance. The current method of preparing porous materials is mainly to use solid phase method, sol-gel method, precipitation method, etc. to synthesize powder, then use foaming agent, binder, etc. to compound with the powder, and then p...

Claims

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Application Information

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IPC IPC(8): C04B35/16C04B35/624C04B38/06
CPCC04B35/16C04B35/624C04B38/067C04B2235/3298C04B2235/785C04B38/0645C04B38/0058C04B38/0054
Inventor 伍媛婷栗梦龙张娟娟王秀峰
Owner SHAANXI UNIV OF SCI & TECH
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