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Method for preparing silicon dioxide-silver nanometer composite microspheres

A technology of silicon dioxide and composite microspheres, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of poor thermal stability and low mechanical strength of polymers, and achieve high dispersion, small diameter of metal ions, and firm bonding. Effect

Inactive Publication Date: 2012-05-02
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the simple use of polymers to support nano-metal particles has the disadvantages of poor thermal stability and low mechanical strength of polymers.

Method used

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  • Method for preparing silicon dioxide-silver nanometer composite microspheres
  • Method for preparing silicon dioxide-silver nanometer composite microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 640 g of absolute ethanol (chemically pure, the same below), 80 g of deionized water, 28 g (26% by weight, the same below) of ammonia water, stirred and mixed evenly at room temperature, and then added 40 g of ethyl orthosilicate (chemically pure, The same below), stirred and reacted at room temperature for 12 hours to obtain a milky white, uniform nano-silica solution. Add 4g of silane coupling agent γ-(methacryloyloxy)propyltrimethoxysilane (chemically pure, the same below) to the above-mentioned prepared nano-silica dispersion, and react continuously at room temperature for 24 hours, The obtained modified nano-silica dispersion liquid was centrifuged. Wash with ethanol for 3 times, and vacuum dry at 78° C. for 12 hours to obtain silica colloidal microspheres with double bonds on the surface. Ultrasonic dispersion of 2.5g surface-modified silica colloidal microspheres in 125g DMF (chemically pure, the same below) at room temperature, ultrasonic dispersion time 10-20 ...

Embodiment 2

[0020] 160g of absolute ethanol, 20g of deionized water, and 7ml of ammonia water were mixed evenly at room temperature, then 20g of ethyl orthosilicate was added, and stirred at room temperature for 24 hours to obtain a milky white, uniform nano-silica solution. 2 g of silane coupling agent vinyltrimethoxysilane was added to the above prepared nano-silica dispersion, and after continuous reaction at room temperature for 12 hours, the obtained modified nano-silica dispersion was centrifuged. Wash with ethanol three times, and vacuum dry at 78°C for 12 hours. 2.5 g of surface-modified silica colloidal microspheres were ultrasonically dispersed in 100 g of DMF, and the ultrasonic dispersion time was 10-20 minutes. Added 12.5 g of acrylic acid and 125 mg of initiator AIBN, and reacted for 10 hours under nitrogen protection. The product was separated by a high-speed centrifuge, washed three times with water, and dried in vacuum at 78°C for 12 hours to obtain a white powder that is...

Embodiment 3

[0022]160 g of absolute ethanol, 80 g of deionized water, and 28 g of ammonia water were mixed uniformly at room temperature, then 40 g of ethyl orthosilicate was added, and stirred at room temperature for 12 hours to obtain a milky white, uniform nano-silica solution. 4 g of coupling agent vinyltriethoxysilane was added to the prepared nano-silica dispersion, and after continuous reaction at room temperature for 24 hours, the obtained modified nano-silica dispersion was centrifuged. Wash with ethanol three times, and vacuum dry at 78°C for 12 hours. 2.5 g of surface-modified silica colloidal microspheres were ultrasonically dispersed in 25 g of DMF, and the ultrasonic dispersion time was 10-20 minutes. Added 25 g of acrylic acid and 25 mg of initiator AIBN, and reacted for 10 hours under nitrogen protection. The product was separated by a high-speed centrifuge, washed three times with water, and dried in vacuum at 78°C for 12 hours to obtain a white powder that is silica / poly...

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Abstract

The invention relates to a method for preparing silicon dioxide-nanometer noble metal composite microspheres. The method comprises the following steps of: 1) preparing modified silicon dioxide colloid microspheres; 2) dispersing the modified silicon dioxide colloid microspheres in dimethyl formamide (DMF), adding an organic monomer and an initiator for reacting, performing centrifugal separation, washing, and drying to obtain silicon dioxide / polymer composite microspheres; and 3) dispersing the silicon dioxide / polymer composite microspheres in deionized water, dripping a AgNO3 solution, stirring, dripping a reducing agent dropwise, stirring, performing centrifugal separation, washing and drying to obtain the silicon dioxide-silver nanometer composite microspheres. The method has the advantages that the silicon dioxide metal composite material which is high in dispersion degree and firm in combination, and of which the metal ion diameter is small can be obtained under the mild reaction condition; and the specific surface areas of the noble-metal-loaded silicon dioxide composite particles have adjustability. The method can be used for preparing the silicon dioxide silver-loaded nanometer particles, and also can be used for loading other noble metal nanometer particles by silicon dioxide.

Description

technical field [0001] The invention relates to a preparation method of silicon dioxide-nanometer noble metal composite microspheres, in particular to composite microspheres with silica colloid as the core and polymer as the shell to load nano silver particles and the preparation method thereof. Background technique [0002] Nanoparticles such as gold and silver have been used more and more widely due to their properties in optics, electricity, catalysis, biology, and surface-enhanced Raman. However, nanoparticles are easy to agglomerate, resulting in poor stability and a decline in biological performance. Combining metal nanoparticles with other matrix materials can not only reduce the agglomeration of nanoparticles, but also broaden its application. Ultrafine silica particles (including micro- and nano-scale silica) have the characteristics of optical transparency, electrical insulation, chemical corrosion resistance, heat resistance and mechanical stability, and have con...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 郑净植杜飞鹏胡建陈伟
Owner WUHAN INSTITUTE OF TECHNOLOGY
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