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Preparation method of nano-silver sol

A technology of nano-silver sol and solution, which is applied in the field of preparation of nano-silver sol, can solve the problems of poor stability of nano-silver sol system, limit the large-scale application of nano-silver, and require high experimental equipment, and achieve simplified separation and purification operations, easy Operation, the effect of a wide range of particle size changes

Inactive Publication Date: 2010-11-17
SUZHOU YONGTUO ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method achieves a more precise control of the nano-silver particle size, it has high requirements for experimental equipment, the operation process is more complicated, and the stability of the generated nano-silver sol system is poor.
[0007] The defects in the existing preparation methods of nano-silver sol limit the large-scale application of nano-silver to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] On a three-necked flask, the left port is connected to a hydrogen bottle for introducing hydrogen; a thermometer is placed in the right port to detect the temperature of the reaction system; the middle port is used as an exhaust port to remove the air in the bottle. The three-necked flask is fixed in an oil bath.

[0028] After connecting the reaction device, dissolve 0.4g of silver nitrate in 400ml of water to prepare a silver nitrate aqueous solution with a concentration of 1g / L. Add magnets, stir the solution with a magnetic stirrer, and heat the silver nitrate aqueous solution to 70°C under the condition of a stirring speed of 200r / min. Reduce the stirring speed to 50r / min, continuously feed hydrogen to exhaust the air in the three-necked bottle, then close the exhaust port, and reduce the silver nitrate with hydrogen. The reaction was carried out for 1 h, and the reaction was stopped. At this time, the color of the sol was brown. It was detected by a transmission ...

Embodiment 2

[0030] On a three-necked flask, the left port is connected to a hydrogen bottle for introducing hydrogen; a thermometer is placed in the right port to detect the temperature of the reaction system; the middle port is used as an exhaust port to remove the air in the bottle. The three-necked flask is fixed in an oil bath.

[0031] After connecting the reaction device, dissolve 0.3g of silver nitrate in 400ml of water to prepare a silver nitrate aqueous solution with a concentration of 0.75g / L. Add magnets, stir the solution with a magnetic stirrer, and heat the silver nitrate aqueous solution to 75° C. under the condition of a stirring speed of 400 r / min. Reduce the stirring speed to 30r / min, continuously feed hydrogen to exhaust the air in the three-necked bottle, then close the exhaust port, and hydrogen will reduce silver nitrate. The reaction was carried out for 2 hours, and the reaction was stopped. At this time, the color of the sol was gray. It was detected by TEM that t...

Embodiment 3

[0033] On a three-necked flask, the left port is connected to a hydrogen bottle for introducing hydrogen; a thermometer is placed in the right port to detect the temperature of the reaction system; the middle port is used as an exhaust port to remove the air in the bottle. The three-necked flask is fixed in an oil bath.

[0034] After connecting the reaction device, dissolve 0.4g of silver nitrate in 400ml of water to prepare a silver nitrate aqueous solution with a concentration of 1g / L. Add magnets, stir the solution with a magnetic stirrer, and heat the silver nitrate aqueous solution to 70° C. under the condition of a stirring speed of 600 r / min. Reduce the stirring speed to 50r / min, continuously feed hydrogen to exhaust the air in the three-necked bottle, then close the exhaust port, and reduce the silver nitrate with hydrogen. The reaction was carried out for 4 hours, and the reaction was stopped. At this time, the color of the sol was grayish green. It was detected by ...

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Abstract

The invention discloses a preparation method of nano-silver sol, which comprises the following steps of: a) dissolving silver nitrate into ultrapure water, and obtaining silver nitrate solution; b) using a stirring device for rapidly stirring the silver nitrate solution; c) heating the silver nitrate solution by oil bath, and reducing the stirring speed of the stirring device after heating to a certain temperature; and d) continuously filling hydrogen for reducing the silver nitrate solution, and obtaining the nano-silver sol. By controlling the reaction time, the preparation method can control the particle size of nano-silver, and leads the particle size range of the nano-silver to be 10-100nm. The method has simple operation and low cost, and the prepared nano-silver sol has the characteristics of even particle size, high stability and high dispersity; and furthermore, the invention realizes more accurate control for the particle size of the nano-silver.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a preparation method of nano-silver sol. Background technique [0002] Nano Silver (Nano Silver) is a simple substance of metallic silver whose particle size is at the nanoscale. It has stable physical and chemical properties and is widely used in the fields of medical treatment, hygiene, environmental protection, and fine chemicals. [0003] In the field of medical and health care, nano-silver has a strong inhibitory and killing effect on dozens of pathogenic microorganisms such as E. coli, Neisseria gonorrhoeae, and Chlamydia trachomatis, and will not produce drug resistance; In semiconductors or insulators, a large nonlinear polarizability can be obtained. Using this characteristic, optoelectronic devices can be made, such as optical switches, color filters for advanced optical devices, etc.; in chemical reactions, nano-silver can be used as a multi- Catalyst for this re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 姜旭红李艳顾传虎牛燕燕
Owner SUZHOU YONGTUO ENVIRONMENTAL TECH
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