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Preparation method of liquid phase nanometer silver colloid

A technology of nano-silver and colloid, which is applied in the field of preparation of liquid-phase nano-silver colloid, can solve the problems of large nano-silver particle size, complex preparation process and equipment, and achieve the effect of simple operation

Inactive Publication Date: 2014-11-19
宁波蓝威环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods or the prepared nano-silver particle size are relatively large, or the preparation process and equipment are complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh NH 2 CONH 2 27.6 grams, CH 3 CONH 2 27.9 g, AgNO 3 0.8 g, mixed evenly, put into a beaker, placed in a heating mantle to raise the temperature to 70°C, and kept warm until all the solids were dissolved into a liquid to obtain a coordination ionic liquid.

[0016] Weigh 2 grams of glucose, add it to a beaker filled with coordination ionic liquid, stir with a glass rod at 50°C until the glucose is completely dissolved, stir for 5 minutes, cool to room temperature, and obtain liquid-phase nano-silver colloid.

[0017] Pour the colloid into pure water and leave it for 3 days without precipitation. Add hydrochloric acid solution dropwise for inspection, and no silver chloride white precipitation occurs. It shows that the silver in the nano-silver liquid exists in the form of silver nanoparticles, and there is no silver ion.

[0018] Electron microscope scanning shows that the particle size of silver in the nano-silver liquid is between 4-8nm, and the distribution ...

Embodiment 2

[0020] Weigh NH 2 CONH 2 27.6 g, NH(CH 2 ) 5 CO 50.9 g, AgNO 3 1.0 g, mixed evenly, put into a beaker, placed in a heating mantle to raise the temperature to 65°C, and kept warm until all the solids were dissolved into a liquid to obtain a coordination ionic liquid.

[0021] Weigh 3 grams of glucose, add it to a beaker filled with coordination ionic liquid, and stir with a glass rod at 40°C until the glucose is completely dissolved, then stir for 5 minutes, and cool to room temperature to obtain a liquid-phase nano-silver colloid.

[0022] Pour the colloid into pure water and leave it for 3 days without precipitation. Add hydrochloric acid solution dropwise for inspection, and no silver chloride white precipitation occurs.

Embodiment 3

[0024] Weigh CH 3 CONH 2 27.9 g, NH(CH 2 ) 5 50.9 g of CO and 1.0 g of AgNO were mixed, put into a beaker, placed in a heating mantle to raise the temperature to 60°C, and kept warm until all the solids were dissolved into liquid to obtain a coordination ionic liquid.

[0025] Weigh 3 grams of glucose, add it to a beaker filled with coordination ionic liquid, stir with a glass rod at 80°C until the glucose is completely dissolved, then stir for 5 minutes, and cool to room temperature to obtain liquid-phase nano-silver colloid.

[0026] Pour the colloid into pure water and leave it for 3 days without precipitation. Add hydrochloric acid solution dropwise for inspection, and no silver chloride white precipitation occurs.

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Abstract

The invention involves a preparation method of liquid phase nanometer silver colloid. The method is characterized by comprising the following steps that first, silver salt compounds and ligand are evenly mixed according to the weight ratio of 1:90 to 1:100, the mixture is heated to 55 DEG C to 75 DEG C, and the temperature is kept so that uniform liquid can be formed, wherein the ligand is organic matter containing amido or carbonyl groups; second, reduction agents are added into the liquid, the weight ratio of the reduction agents to the silver salt compounds is 1:2 to 1:3, stirring is performed at the temperature ranging from 20 DEG C to 100 DEG C till the reduction agents are totally dissolved, and then nanometer silver liquid can be obtained; the reduction agents are selected from carbohydrates having the reducibility, or polyalcohol having the reducibility, or solid organic acids having the reducibility. The preparation method is simple and easy to operate, the made liquid phase nanometer silver liquid is stable, and the diameter of nanometer silver particles ranges from 2 nm to 10 nm.

Description

technical field [0001] The invention relates to a preparation method of liquid-phase nano-silver colloid. Background technique [0002] Nano-silver belongs to metal nano-materials. Due to its large surface area, it has high surface energy, surface activity and good catalytic performance. It is widely used in superconducting, chemical, medical, optical and electronic industries. The preparation technology of nano-silver has developed rapidly, mainly including: aqueous solution chemical reduction method, hydrothermal reduction method, alcohol thermal reduction method, electrochemical reduction method, photocatalytic reduction method, etc., as well as auxiliary ultrasonic, microwave and other means to accelerate the preparation process and Nano-silver with smaller particle size is produced. The above methods either prepare nano-silver particles with relatively large diameters, or have complex preparation techniques and equipment. Contents of the invention [0003] The techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y30/00B82Y40/00
Inventor 陈晓辉徐普南林眼张星辰
Owner 宁波蓝威环保科技有限公司
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