Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing nano silver on silica-gel surface

A nano-silver and silica gel technology, applied in the field of nano-composite material preparation, can solve the problems of large silver particles, loss of silver grain characteristics, serious agglomeration, etc., and achieve the effect of small particle size, reduced agglomeration, and uniform distribution

Inactive Publication Date: 2008-03-26
ZHEJIANG UNIV
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former forms larger silver particles and agglomerates seriously; the latter often obtains silver dispersed at the atomic level on the surface of silica gel instead of silver particles, which loses the characteristics of silver grains

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing nano silver on silica-gel surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] AgNO 3 Dissolve in ethanol and prepare a solution with a concentration of 0.008g / ml. Add 200ml of absolute ethanol and 0.5ml of water into a three-neck flask, add 0.5g of SiO 2 , stirred into a uniform suspension in a constant temperature water bath at 25°C. Add 0.054g NaOH and stir at constant temperature for 6hr. Under the condition of stirring, 30ml AgNO at the rate of 1ml / min 3 The ethanol solution was added dropwise into the three-neck flask at an even speed, and after stirring for 2 hours, solid precipitation was obtained by centrifugation. After washing with ethanol several times, the product was obtained by drying. According to X-ray diffraction analysis, calculated according to the Scherrer formula, the average particle size is 7.5nm. The electron microscope photo of the product is shown in Figure 1. Ag particles are independently dispersed on the surface of the network-like silica gel.

Embodiment 2

[0016] Dissolve silver acetate in ethanol to prepare a solution with a concentration of 0.05g / ml. Add 200ml of anhydrous methanol and 40ml of water into a three-neck flask, add 0.2g of SiO 2 , stirred into a homogeneous suspension in a constant temperature water bath at -20°C. Add 0.01g KOH and stir at constant temperature for 48hr. Under stirring conditions, 30ml of silver acetate ethanol solution was added dropwise into the three-necked flask at a rate of 1ml / min, and after stirring for 10hr, solid precipitation was obtained by centrifugation. After washing with ethanol several times, the product was obtained by drying. According to X-ray diffraction analysis, according to the Scherrer formula calculation, the average particle diameter is 4.6nm.

Embodiment 3

[0018] AgNO 3 Dissolve in water and prepare a solution with a concentration of 0.3g / ml. Add 200ml of absolute ethanol and 0.2ml of water into a three-necked flask, add 50g of SiO 2 , stirred into a uniform suspension in a constant temperature water bath at 70°C. Add 1g NaOH and stir at constant temperature for 10min. Under stirring conditions, 5ml AgNO at a rate of 0.5ml / min 3 The ethanol solution was added dropwise into the three-neck flask at an even speed, and after stirring for 10 minutes, solid precipitation was obtained by centrifugation. After washing with ethanol several times, the product was obtained by drying. According to X-ray diffraction analysis, according to Scherrer formula calculation, it can be seen that the average particle diameter is 10.5nm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The process of preparing nanometer silver on the surface of silica gel includes the following steps: 1. compounding 0.1-20vol% concentration water solution of lower alcohol, adding SiO2 via stirring, adding inorganic alkali and stirring for further 10 min to 48 hr; and 2. compounding 1-300 g / L concentration water or alcohol solution of Ag compound, dropping the reaction system obtained in the step 1, reacting at -20 deg c to 70 deg c for 10 min to 10 hr, centrifugally separating, and drying to obtain composite material with silver supported on the surface of silica gel. The process has the features of being convenient, simple, no pollution, etc and the product has the advantages of small particle size, high purity, homogeneous distribution and great specific surface area.

Description

technical field [0001] The invention relates to a method for preparing nano-silver on the surface of silica gel, belonging to the field of nano-composite material preparation. Background technique [0002] Nano silver is an emerging functional material, which is widely used in superconductivity, chemical industry, medicine, optics, electronics, electrical appliances and other industries. It can be used as catalyst, sensor, heat exchange material, bactericide, battery electrode material, and has broad application prospects. . In recent years, nano-silver preparation technology has developed rapidly, and there are various methods. According to the implementation state, it can be divided into emulsion method, solution method, and gas phase method; according to the reaction conditions, there are reducing agent reduction, light, ultrasound, heating, electrode electrolysis, γ-ray radiation, etc.; according to the reaction precursor, there are ionic and other High-purity solid si...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/16
Inventor 蒋新
Owner ZHEJIANG UNIV