Preparation of hollow mesoporous silicon dioxide sphere with continuously variable cavity diameter

A technology of mesoporous silica and silica spheres, applied in the field of inorganic mesoporous materials, can solve the problems of large diameter of spheres and limited application, and achieve the effect of increasing storage capacity and simple preparation process

Inactive Publication Date: 2009-07-08
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diameter of the sphere is too large, reaching 4um, which limits its application objectively.

Method used

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  • Preparation of hollow mesoporous silicon dioxide sphere with continuously variable cavity diameter
  • Preparation of hollow mesoporous silicon dioxide sphere with continuously variable cavity diameter
  • Preparation of hollow mesoporous silicon dioxide sphere with continuously variable cavity diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 0.1g of cationic surfactant cetyltrimethylammonium bromide (CTAB) and 3ml of tetraethyl orthosilicate (TEOS) in 12ml, or 20ml, or 30ml, or 50ml of ethanol solution, stir well, Pour quickly into 200ml of ammonia solution with a concentration of 0.2M. Stirring was continued for 5 minutes and then stopped to obtain white flocs. The precipitate is filtered out and calcined, the heating rate is 2°C / min, and the temperature is kept at 600°C for one hour to obtain a cavity diameter of 0nm (such as figure 1 (a)), or 15nm (such as figure 1 (b)), or 50nm (such as figure 1 (c)), or 300nm (such as figure 1 (d)) Hollow mesoporous silica spheres. The thickness of the spherical wall is in the range of 25-50nm, and the diameter of the mesopores on the spherical wall is 2.5-3.2nm. The two-dimensional hexagonal mesopores are arranged perpendicular to the surface of the spherical wall. The SAXRD of the four samples showed that the two-dimensional hexagonal symmetry of the m...

Embodiment 2

[0021] Dissolve 1 g of cationic surfactant dodecyltrimethylammonium chloride (DTACl) and 9 ml of tetraethyl orthosilicate (TEOS) in 15 ml, or 25 ml, or 40 ml, or 60 ml of ethanol solution, stir thoroughly, and quickly Pour it into 200ml of ammonia solution with a concentration of 0.4M. Stirring was continued for 5 minutes and then stopped to obtain white flocs. The precipitate is filtered out and calcined, the heating rate is 2°C / min, and the temperature is kept at 600°C for one hour to obtain a cavity diameter of 0nm (such as figure 2 (a)), or 15nm, (eg figure 2 (b)) or 50nm (such as figure 2 (c)), or 300nm (such as figure 2 (d)) Hollow mesoporous silica spheres. The thickness of the spherical wall is in the range of 25-50nm, and the diameter of the mesopores on the spherical wall is 2.5-3.2nm. The two-dimensional hexagonal mesopores are arranged perpendicular to the surface of the spherical wall.

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Abstract

The invention relates to a method for preparing a hollow mesoporous silicon dioxide ball with continuously-changing cavity diameter, which is characterized by specifically comprising the following steps: (1) dissolving 0.05 to 2 g of hexadecyl trimethyl ammonium bromide into 12 to 70 ml of ethanol to be stirred for 10 minutes to be dissolved fully, and adding 0.5 to 9 ml of ethyl orthosilicate for stirring fully; (2) preparing 0.01 to 0.4M of ammonia solution; (3) stirring the ammonia solution at a high speed, adding the mixed solution prepared in the step (1) into the ammonia solution quickly; stopping stirring after five minutes; and generating white floccule floating on the surface of the liquid, wherein the volume ratio of the mixed solution to the ammonia solution is 1:5-1:20; and (4) heating up the filtered white precipitate to 600 DEG C at a speed of 2 DEG C/min, and keeping the temperature for 1 hour to obtain the hollow mesoporous silicon dioxide ball.

Description

Technical field: [0001] The invention relates to a method for preparing hollow mesoporous silica spheres with continuously changing cavity diameters, in particular to a method for preparing hollow mesoporous silica spheres by mixing ethanol, cetyltrimethylammonium bromide and ethyl orthosilicate Template synthesis of hollow mesoporous silica spheres, and a method for tuning the cavity diameter. It belongs to the technical field of inorganic mesoporous materials. Background technique: [0002] According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be divided into three categories according to their pore diameters: materials with a pore diameter less than 2 nm are microporous materials; materials with a pore diameter of 2-50 nm are mesoporous Materials (mesoporous materials); materials with a pore diameter greater than 50nm are macroporous materials (macroporous materials). Zeolite (zeolite) molecular sieve is the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 郗杨郝维昌王天民
Owner BEIHANG UNIV
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