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Prepn of silica with great specific surface area

A high specific surface area, silicon oxide technology, applied in the direction of silicon oxide, silicon dioxide, chemical instruments and methods, etc., can solve the problems of small specific surface area and limited application

Inactive Publication Date: 2002-05-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​this material is relatively small compared with the general catalyst carrier, which limits its application in catalysis; and the pore wall of this material is completely composed of silicon oxide, which limits its application in optics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1, at first, in 10 grams of ethanol solvent, add 0.4 gram (0.1M) hydrochloric acid, 0.5 gram of water and 2.08 gram of orthosilicate ethyl ester, stir at room temperature and carry out hydrolysis; In another 5 grams of ethanol solvent, add 0.9 gram triblock surfactant poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)(EO-PO-EO) (Pluronic P123, average molecular weight=5800), stirred and dissolved at room temperature. After 30 minutes, the two solutions were combined and stirring was continued for 2 hours.

[0016] A solution (10% by weight) dispersed with polystyrene beads of uniform size (210 nm) was added dropwise on a silicon substrate or poured into a Petri dish at room temperature. The solution dispersed with polystyrene beads is volatilized under vacuum conditions, and after volatilization is dry, the polystyrene beads are piled up in a face-centered cubic stacking manner.

[0017] Transfer the bulk material formed by the accumulation of poly...

Embodiment 2

[0019] Example 2, in the first step of Example 1, except that 0.9 grams of triblock surfactant poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)(EO-PO-EO)(Pluronic P123 , average molecular weight=5800) is changed into 0.8 gram cetyltrimethylammonium bromide (CTAB), and other each steps are all the same.

[0020] Scanning electron microscopy (SEM) shows that the obtained macroporous-mesoporous dual-porous silica material has a macropore diameter of about 140nm and has the same three-dimensional face-centered cubic structure as polystyrene spheres. The low-temperature nitrogen adsorption-desorption curve (BET) shows that the mesopore diameter in the material is 4nm at this time. In the transmission electron microscope (TEM) picture, the mesopores are still in a two-dimensional ordered hexagonal arrangement.

Embodiment 3

[0021] Example 3, in the second step of Example 1, 300 nm polystyrene beads were used as templates. The other steps and reagents are the same.

[0022] Scanning electron microscopy (SEM) shows that the obtained macroporous-mesoporous dual-porous silica material has a macropore diameter of about 210nm and has the same three-dimensional face-centered cubic structure as polystyrene spheres. The size and structure of the mesopores are the same as in Example 1. It can be seen that by changing the size of the polystyrene sphere, the macropore diameter in the mesoporous double-porous silica material can be changed.

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PUM

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Abstract

The present invention relates to method of preparing silicon oxide material having high degree of order, large pore-mosopore dual pore and high specific surface area. Surfactant is used as structure guide agent combine with inorganic silicon material to assemble into ordered structure, and under the guide of new large pore template agent polystyrene ball, through sol-gel process to form into shape. Surfactant and polystyrene ball are rmoved under high temperature, thereby multigrade silicon oxide material with high degree of order and large pore mesopole is obtd. The invented multi grade porematerial can be extensively used in adsorption, separation, sensor, optical material etc.

Description

technical field [0001] The invention belongs to the field of inorganic porous materials, and relates to a method for preparing a high-order macropore-mesoporous dual-pore and high specific surface area silicon oxide material. technical background [0002] At present, people use a kind of artificial opal piled up by polystyrene balls of uniform size as a template, infiltrate silica sol into it, and after the sol is solidified, remove the polystyrene balls as a template to produce macroporous silicon material. Because the macropores of this material have a three-dimensional ordered face-centered cubic structure, it has special optical properties. Moreover, the pores of this material are more than 50nm, which can be used for the separation of large proteins and catalytic reactions. However, the specific surface area of ​​this material is smaller than that of general catalyst supports, which limits its application in catalysis; and the pore walls of this material are completel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01B39/00
Inventor 赵东元罗骞屠波周亚明李莉杨柏
Owner FUDAN UNIV
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