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Multistage pore silica nano material and preparation method thereof

A technology of silica and nanomaterials, applied in the field of material science, which can solve the problems of small specific surface area and underdeveloped pore structure, etc.

Inactive Publication Date: 2013-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is more controllable to prepare multi-level materials, but the pore structure of the product is not developed enough, and the specific surface area is small

Method used

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  • Multistage pore silica nano material and preparation method thereof
  • Multistage pore silica nano material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 20mg of polyvinylpyrrolidone (molecular weight: 38000) in 100ml of absolute ethanol, add 20ml of deionized water, 3g of ammonia water, and 1.5g of tetraethylsilicate, stir at room temperature for 14 hours, and centrifuge to separate silica colloidal particles. It was dispersed in 20 ml of deionized water. Another 0.29 g of cetyltrimethylammonium bromide was dissolved in 30 ml of deionized water, 3 g of ammonia water was added, mixed with the above colloidal silica particle solution, and stirred at room temperature for 0.5 h. The entire reaction mixture was moved into a stainless steel autoclave with a polytetrafluoroethylene liner, treated at 100°C for 24 hours, centrifuged to separate the solid product, dried, and roasted at 550°C for 6 hours to obtain a multi-stage vesicle-shaped channel located in the center of the particle. Silica nanomaterials.

Embodiment 2

[0021] Dissolve 40mg of polyvinylpyrrolidone (molecular weight: 38000) in 100ml of absolute ethanol, add 20ml of deionized water, 3g of ammonia water, and 1.5g of tetraethylsilicate, stir at room temperature for 14 hours, and centrifuge to separate colloidal silica particles. It was dispersed in 20 ml of deionized water. Another 0.29 g of cetyltrimethylammonium bromide was dissolved in 30 ml of deionized water, 3 g of ammonia water was added, mixed with the above colloidal silica particle solution, and stirred at room temperature for 0.5 h. The entire reaction mixture was moved into a stainless steel autoclave with a polytetrafluoroethylene liner, treated at 100°C for 24 hours, centrifuged to separate the solid product, dried, and roasted at 550°C for 6 hours to obtain a multi-stage vesicle-shaped channel located in the center of the particle. Silica nanomaterials.

Embodiment 3

[0023] Take 20mg of polyvinylpyrrolidone (molecular weight 58000) and dissolve it in 100ml of absolute ethanol, add 20ml of deionized water, 3g of ammonia water, and 1.5g of tetraethylsilicate, stir at room temperature for 14 hours, and centrifuge to separate silica colloidal particles. It was dispersed in 20 ml of deionized water. Another 0.29 g of cetyltrimethylammonium bromide was dissolved in 30 ml of deionized water, 3 g of ammonia water was added, mixed with the above colloidal silica particle solution, and stirred at room temperature for 0.5 h. The entire reaction mixture was moved into a stainless steel autoclave with a polytetrafluoroethylene liner, treated at 100°C for 24 hours, centrifuged to separate the solid product, dried, and roasted at 550°C for 6 hours to obtain a multi-stage vesicle-shaped channel located in the center of the particle. Silica nanomaterials.

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Abstract

The invention provides a multistage pore silica nano material and a preparation method thereof. The multistage pore silica nano material is characterized in that the material is almost spherical in shape, the diameter is 50-250 nm, and the specific surface area is 500-1000m<2> / g; and the material is provided with two different kinds of pores, wherein the pores of one kind are mesoporous main pores of wormlike shapes or almost hexagonal structures, the pore diameter is 2-3 nm, the pores of the other kind are vesicle-shaped pores located in the center of the sphere of the material or evenly scattered inside the sphere, and the pore diameter is 5-50 nm. The two kinds of pores are mutually communicated. The material is prepared by using a two-step method, namely, first, a proper amount of polyvinyl pyrrolidone (PVP) is added in a traditional sol-gel process to obtain silica colloidal particles, and then the multistage pore material is obtained by using a false crystal conversion technology. The material is moderate in preparation condition and simple and controllable in process.

Description

technical field [0001] The invention relates to a multi-level pore nanometer material and a preparation method thereof, belonging to the field of material science. Background technique [0002] Nature, 1992, 359, 710 reported ordered mesoporous silica material for the first time. This kind of porous material has wide pores with a pore size greater than 2.0nm and a huge specific surface area, which overcomes the limitation of traditional zeolite molecular sieve materials with a pore size less than 1.5nm, and has good performance in the fields of catalysis, adsorption and separation, semiconductor and optoelectronic devices, and biomedicine. application prospects. [0003] The synthesis of ordered mesoporous silica mainly adopts the supramolecular self-assembly route, that is, the interaction between inorganic precursors and surfactants forms a framework with a specific structure. However, the materials prepared by this conventional method often have a single pore structure,...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y40/00
Inventor 吴立冬卢宪波苏凡陈吉平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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