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Transparent meso-porousearth silicon gel monolithi material

A technology of mesoporous silica and gel

Inactive Publication Date: 2008-10-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods generally have harsh requirements on equipment, high energy consumption, very long time (about 8-12 weeks), or complicated operation steps, which are not conducive to the industrial production of such materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] 0.5 g of Pluronic 123 (P123, EO 20 PO 70 EO 20 ) was dissolved in 2.32 gram of ethanol, 0.27 gram of water and 0.1 gram of 1mol / L hydrochloric acid, stirred to dissolve, then added 1.04 gram of TEOS, and continued to stir for about 60 minutes. Move the prepared sol into a container with a certain shape, seal the container with a plastic film with 3 pinholes, let it stand at a constant temperature of 60°C for 42 hours to gel the system, seal the pinholes, and continue at 60°C It was aged at ℃ for 1 day, and then dried in the open at 60 ℃. After 3 days, a complete transparent mesoporous silica gel monolithic material was obtained. Then the temperature was raised to 550° C. at a rate of 2° C. / min and calcined for 6 hours to completely remove the surfactant template to obtain an ordered mesoporous silica monolithic material. By XRD, N 2 Analytical tests such as isothermal adsorption show that the obtained material has a high-quality hexagonal phase structure, and its sp...

Embodiment approach 2

[0020] 0.5 g of Pluronic 123 (P123, EO 20 PO 70 EO 20 ) was dissolved in 2.32 gram of ethanol, 0.27 gram of water and 0.1 gram of 1mol / L hydrochloric acid, stirred to dissolve, then added 1.04 gram of TEOS, and continued to stir for about 90 minutes. Move the sol into a container with a certain shape, seal the container with a plastic film with 5 pinholes, let it stand at a constant temperature of 80°C for 20 hours to make it gel, seal the pinholes, and then cool down to 60°C Continue to stand and age for 1 day, and then dry in the open at 60°C. After 3 days, a complete transparent mesoporous silica gel monolithic material is obtained. Then, the temperature was raised to 550° C. at a rate of 2° C. / min and baked for 6 hours to completely remove the surfactant template. Others were the same as Embodiment 1.

Embodiment approach 3

[0022] 1.156 g of F127 (EO 106 PO 70 EO 106 ) was dissolved in 2.32 gram of ethanol, 0.27 gram of water and 0.1 gram of 1mol / L hydrochloric acid, stirred to dissolve, then added 1.04 gram of TEOS, and continued to stir for about 120 minutes. Move the prepared sol into a container with a certain shape, seal the container with a plastic film with 4 pinholes, let it stand at a constant temperature of 55°C for 48 hours to gel the system, seal the pinholes, and continue at 55°C. It was aged at ℃ for 2 days, and then dried in the open at 55 ℃. After 3 days, a complete transparent mesoporous silica gel monolithic material was obtained. Then the temperature was raised to 550° C. at a rate of 2° C. / min and calcined for 6 hours to completely remove the surfactant template to obtain an ordered mesoporous silica monolithic material. By XRD, N 2 Analytical tests such as isothermal adsorption show that the obtained material has a high-quality hexagonal phase structure, and its specific ...

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PUM

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Abstract

The invention relates to a transparent mesoporous silicon dioxide gel monolith material which pertains to the technical field of inorganic porous material, in particular to an ordered mesoporous silicon dioxide gel monolith material with large size, no crackle and optical transparentness. The material is characterized in that direct conversion of sol, gel, aging and drying can be realized at high temperature by adjusting synthesis ratio without any special protective means or complicated operation procedures. The method has a short synthesis period and simple operation steps and is easy to control. The material generated by the method has an ordered hexagonal phase mesoporous structure with 2nm to 10nm of aperture, 0.2cm<3> / g to 0.8cm<3> / g of pore volume, 450m<2> / g to 850m<2> / g of the specific area and 2.2nm of wall thickness, and the wall thickness of the structure is larger than the aperture. The transmissivity of visible light of the structure is similar to optical glass with the same thickness, thereby having wide application value in the research aspect of novel optical units, electrical units and magnetic units.

Description

technical field [0001] The invention relates to a transparent mesoporous silica gel monolithic material, which belongs to the technical field of inorganic porous materials, and specifically relates to a large-sized, crack-free, transparent mesoporous silica gel monolithic material and simple, fast and efficient Preparation. Background technique [0002] Mesoporous silica is a new type of porous material synthesized by using surfactant as a template, because of its large specific surface area, high pore volume, regular and diverse pore structure and its pore distribution in a wide range It has shown broad application prospects in the fields of adsorption, separation and catalysis. More importantly, the ordered organization and periodic arrangement of this mesoporous structure at the molecular level is also the basis for the heterogeneous recombination of nanoscale guest molecules such as dye molecules, photosensitive molecules, semiconductor particles or conductive nanowires...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01B33/157
Inventor 王晓钟吕晓梅谢克昌
Owner TAIYUAN UNIV OF TECH
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