Method for preparing spherical nano-silver particles

A spherical nano silver and particle technology, applied in the field of inorganic nano materials, can solve the problems of uneven particle size distribution and uneven shape of nano silver particles, and achieve the effect of preventing silver salt precipitation and preventing crystal seed precipitation.

Active Publication Date: 2012-11-21
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem of non-uniform particle size distribution and non-uniform shape in the preparatio

Method used

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  • Method for preparing spherical nano-silver particles
  • Method for preparing spherical nano-silver particles
  • Method for preparing spherical nano-silver particles

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Add 0.1g of anhydrous Na 2 CO 3 Mix evenly with 10g of polyvinylpyrrolidone and 1g of ethylene glycol to obtain mixed solution A;

[0033] (2) Add 12g of AgNO 3 Dissolved in 0.5g of ethylene glycol to obtain mixed solution B;

[0034] (3) Add the mixed solution A to the mixed solution B dropwise, and mix evenly to obtain a colloidal solution;

[0035] (4) The colloidal solution obtained in the step (3) was heated and reacted under 300W microwave irradiation for 5 minutes, and cooled to room temperature to obtain spherical nano-silver particles.

Embodiment 2

[0037] (1) Add 0.15g of anhydrous Na 2 SO 4 and 11g of citric acid and 1.5g of glycerol were uniformly mixed by ultrasonic vibration to obtain a mixed solution A;

[0038] (2) Add 14g of AgNO 3 Dissolved in 1g of glycerol to obtain mixed solution B;

[0039] (3) Add the mixed solution A dropwise to the mixed solution B through a peristaltic pump with a rotating speed of 30 rad / min, and mix evenly to obtain a colloidal solution;

[0040] (4) The colloidal solution obtained in the step (3) was heated and reacted under 350W microwave irradiation for 4 minutes, and cooled to room temperature to obtain spherical nano-silver particles.

Embodiment 3

[0042] (1) 0.2 g of anhydrous NaI, 12 g of polyvinylpyrrolidone and 2 g of polyethylene glycol with a molecular weight of 200 were uniformly mixed by ultrasonic oscillation to obtain a mixed solution A;

[0043] (2) Add 15g of AgNO 3 Dissolved in 2 g of polyethylene glycol with a molecular weight of 200 to obtain a mixed solution B;

[0044] (3) Add the mixed solution A dropwise to the mixed solution B through a peristaltic pump with a rotating speed of 35 rad / min, and mix evenly to obtain a colloidal solution;

[0045] (4) The colloidal solution obtained in the step (3) was heated and reacted under 400W microwave irradiation for 3 minutes, and cooled to room temperature to obtain spherical nano-silver particles.

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Abstract

The invention provides a method for preparing spherical nano-silver particles and belongs to the field of nanotechnology. The method comprises the following steps: (1) mixing sodium salt, macromolecular protective agent and polyhydric alcohol uniformly to obtain a mixed solution A; (2) mixing silver nitrate and polyhydric alcohol uniformly to obtain a mixed solution B; (3) dropwise adding the mixed solution A into the mixed solution B, and mixing the solutions A and B uniformly to obtain a colloidal solution; (4) heating and reacting the colloidal solution obtained in step (3) for 1-5 min under the radiation of microwave of 300-550 W, and cooling the reaction product to the room temperature to obtain the spherical nano-silver particles, wherein the macromolecular protective agent is polyvinylpyrrolidone or citric acid. The spherical nano-silver particles prepared by the method have the advantages of uniform particle size, dispersibility, short reaction time, high production efficiency and high yield.

Description

technical field [0001] The invention relates to an inorganic nano material, in particular to a method for preparing spherical nano silver particles, and belongs to the field of nano technology. Background technique [0002] Nano-silver particles not only have the characteristics of conventional nanoparticles, but also have unique optical, electronic and catalytic properties, which can be used as optical materials, electronic materials and catalyst materials. In practical applications, in order to improve the properties of silver nanoparticles, it is very important to control the shape and size of silver nanoparticles. At present, nano-silver particles with different shapes, such as wires, rods, strips, sheets, etc. , cube, rice shape, ball, leaf shape etc. [0003] Chinese patent document CN100494290C discloses a method for preparing highly dispersed nano-silver particles by the polyol method, specifically (1) adding a polymer protective agent into the polyol under stirrin...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 张竹霞党随虎贾伟刘海瑞邵桂雪许并社
Owner TAIYUAN UNIV OF TECH
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