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Macroporous/mesoporous hollow silica microballoon and its preparation method

A technology of silica and microspheres, applied in the direction of silica, silica, etc., can solve the problem of small mesopores, achieve the effects of controllable pore size, wide application range, and uniform distribution of small pores

Inactive Publication Date: 2012-02-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above-mentioned template method can obtain a hollow mesoporous structure, its mesopores are relatively small, usually 3-5 nm.

Method used

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  • Macroporous/mesoporous hollow silica microballoon and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Preparation of Poly(EGDMA-co-VPy) core microspheres

[0033] Disperse 1.0mL of 4-vinylpyridine (VPy), 1.0mL of ethylene glycol dimethacrylate (EGDMA), and 0.04g of azobisisobutyronitrile (AIBN) in 80mL of acetonitrile, and put them into a clean 100mL two-necked bottle In the middle, install the fractionating column, the condenser and the receiving bottle, and add the zeolite. Use a 100mL electric heating mantle to heat at a voltage of 75V, control it to rise from room temperature to boiling within 30 minutes, and start to distill off the solvent acetonitrile; control it to evaporate 40mL of acetonitrile within 1.5 hours and stop the reaction. The obtained polymer microspheres were suction-filtered with a G-5 sandglass, washed with ethanol three times, soaked for half an hour each time, and dried in a vacuum oven at 40°C to constant weight. The particle size of the obtained Poly(EGDMA-co-VPy) microspheres was 1.513 μm.

[0034] 2. Preparation of PolyAA crown microsp...

Embodiment 2

[0041] 1. Preparation of Poly(EGDMA-co-VPy) core microspheres

[0042] Disperse 1.2mL of 4-vinylpyridine (VPy), 0.8mL of ethylene glycol dimethacrylate (EGDMA), and 0.04g of azobisisobutyronitrile (AIBN) in 80mL of acetonitrile, and put them into a clean 100mL two-necked bottle In the middle, install the fractionating column, the condenser and the receiving bottle, and add the zeolite. Use a 100mL electric heating mantle to heat at a voltage of 75V, control it to rise from room temperature to boiling within 30 minutes, and start to distill off the solvent acetonitrile; control it to evaporate 40mL of acetonitrile within 1.5 hours and stop the reaction. The obtained polymer microspheres were suction-filtered with a G-5 sandglass, washed with ethanol three times, soaked for half an hour each time, and dried in a vacuum oven at 40°C to constant weight. The particle size of the obtained Poly(EGDMA-co-VPy) microspheres was 3.08 μm.

[0043] 2. Preparation of PolyAA crown microsph...

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Abstract

The invention relates to a macroporous / mesoporous hollow silica microballoon and its preparation method. The macroporous / mesoporous hollow microballoon is prepared by the following steps of: carrying out self assembly on organic polymer microballoons with different particle sizes to obtain a template, generating a silica outer layer by in situ method, and calcining to remove the internal organic matter. The internal cavity of the microballon obtained is 500-2000nm controllable and the pore diameter of the microballoon surface is 10-100nm controllable, so as to form the macroporous / mesoporous hollow structure. The preparation method provided by the invention has characteristics of simple condition, convenient operation, easily obtained raw materials, pure product, environmental protection and the like. The silica hollow microballoon provided by the invention can be widely applied in a controllable transport and delivery system of medicament, dye, cosmetic and sensitive reagents such as enzyme and protein as a carrier material, can be used as a lightweight filling material, a high selectivity catalyst or a catalyst carrier, and has a very important value in the aspects of artificial cells, disease diagnosis and the like.

Description

technical field [0001] The invention relates to a method for preparing macroporous / mesoporous hollow silica microspheres, in particular having macroporous cavities and adjustable mesopore sizes, belonging to the technical field of inorganic porous materials. Background technique [0002] According to the definition of the International Association of Pure and Applied Chemistry (lUPAC), porous materials can be divided into three categories according to their pore size: materials with a pore size smaller than 2 nm are microporous materials; materials with a pore size between 2 and 50 nm are mesoporous. Materials (mesoporous materials); materials with a pore diameter greater than 50nm are macroporous materials (macroporous materials). Zeolite molecular sieve is the most common porous material, which has a uniform pore structure, strong acidity and high hydrothermal stability, and is widely used as a solid acid shape-selective catalyst for heterogeneous catalytic reactions. Sma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 代昭张杰刘燕
Owner TIANJIN POLYTECHNIC UNIV
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