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Method for preparing mesoporous silicon dioxide nano rod through regulation and control

A mesoporous silica and nanorod technology, applied in the directions of silica, silica, nanotechnology, etc., can solve the problems of heating, long reaction time, complicated process, etc. Simple and easy-to-control process

Inactive Publication Date: 2012-05-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Some of the above-mentioned preparation methods related to mesoporous silica have complex processes and long reaction times, some require the use of co-template agents, special template agents, or co-solvents or dispersants, and some require heated reaction conditions

Method used

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  • Method for preparing mesoporous silicon dioxide nano rod through regulation and control
  • Method for preparing mesoporous silicon dioxide nano rod through regulation and control
  • Method for preparing mesoporous silicon dioxide nano rod through regulation and control

Examples

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example 1

[0028] The molar ratio of ammonia water: ethanol: cetyltrimethylammonium bromide: tetraethyl orthosilicate: water is 10.4: 19.9: 0.3: 1: 371, and the mass concentration of ammonia water is 25%. The specific steps are: add ethanol, water and ammonia water into the beaker according to the ratio and mix them, and stir magnetically for 15 minutes to obtain a mixed solution; then add cetyltrimethylammonium bromide to the beaker, stir for 30 minutes until completely dissolved; cetyl trimethyl ammonium bromide After the trimethylammonium bromide is dissolved, add tetraethyl orthosilicate to the beaker, and stir for 2 hours; after the reaction, filter the reaction liquid to obtain a sample, wash the sample with distilled water for 3-5 times, then dry it at room temperature for 4 days, and then The sample was heated to 550°C at a rate of 1°C / min and calcined for 6 hours to obtain silica nanorods with a length of about 500-1200 nm, a diameter of about 250-350 nm, and a mesopore size of a...

example 2

[0030] The molar ratio of ammonia water: ethanol: cetyltrimethylammonium bromide: tetraethylorthosilicate: water is 3.4:4.4:0.5:1:619, and the mass concentration of ammonia water is 25%. The specific steps are: add ethanol, water and ammonia water into the beaker according to the ratio and mix them, and stir magnetically for 30 minutes to obtain a mixed solution; then add cetyltrimethylammonium bromide to the beaker, stir for 30 minutes until completely dissolved; cetyl trimethylammonium bromide After trimethylammonium bromide is dissolved, add tetraethyl orthosilicate to the beaker, and stir for 3 hours; after the reaction, filter the reaction solution to obtain a sample, wash the sample with distilled water for 3-5 times, then dry it at room temperature for 5 days, and then The sample was heated to 550°C at a rate of 1°C / min and calcined for 6 hours to obtain silica nanorods with a length of about 900 nm, a diameter of about 200 nm, and a mesopore size of about 2.66 nm, see ...

example 3

[0032] The molar ratio of ammonia water: ethanol: cetyltrimethylammonium bromide: orthosilicate ethyl ester: water is 3.4:4.4:0.5:1:1486, and the mass concentration of ammonia water is 25%. The specific steps are: add ethanol, water and ammonia water into the beaker according to the ratio and mix them, and stir magnetically for 20 minutes to obtain a mixed solution; then add cetyltrimethylammonium bromide to the beaker, stir for 20 minutes until completely dissolved; cetyl trimethyl ammonium bromide After the trimethylammonium bromide is dissolved, add tetraethyl orthosilicate to the beaker, and stir for 2 hours; after the reaction, filter the reaction liquid to obtain a sample, wash the sample with distilled water for 3-5 times, then dry it at room temperature for 7 days, and then The sample was heated to 550°C at a rate of 1°C / min and calcined for 6h to obtain silica nanorods with a length of about 100-250 nm, a diameter of about 60 nm, and a mesopore size of about 2.85 nm, s...

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Abstract

The invention discloses a method for preparing mesoporous silicon dioxide nano rods through regulation and control. The method uses ammonia water as catalyst, ethanol as cosolvent, cetyl trimethyl ammonium bromide as pore-forming material, tetraethoxysilane and water as reactants, and adopts a sol-gel method to prepare the mesoporous silicon dioxide nano rods, wherein the molar ratio of ammonia water to ethanol to cetyl trimethyl ammonium bromide to tetraethoxysilane to water is 10.4:19.9:0.3:1:371-2972. The invention has the advantages that the reaction conditions are mild, the reaction is required to be conducted at normal temperature only, heating or protective gas is not required and the preparation cost is low; mesoporous silicon dioxide nano rods with different lengths and diameterscan be produced through changing the added water amount only, the preparation process is simple and can be controlled easily, and the reaction time is short; and the shape of products prepared through the method of the invention is unitary and the products are not required to be further separated.

Description

technical field [0001] The invention relates to a method for regulating and preparing mesoporous silica nanorods, in particular to a method for preparing silica nanorods of different sizes by regulating and controlling the amount of water added, and belongs to the technical field of silica materials. Background technique [0002] Mesoporous silica materials have broad application prospects in the fields of adsorption and separation, and catalysts. The shape and size have an important influence on the application of mesoporous silica materials, so the control of shape and size is one of the hotspots in the research of this type of materials. Currently, there are few methods for preparing mesoporous silica rods. Dang Wenxiu et al. (Chemical Bulletin, 2006, 6:430-433) used hexadecyl pyridinium chloride as template agent, formamide as co-solvent, and utilized sol- Mesoporous silica rods with a length of about 30-50 μm and a diameter of about 5 μm were prepared by gel reaction....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18B82B3/00
Inventor 刘世权王海霞
Owner UNIV OF JINAN