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Microwave preparing method for nanometer silver or gold

A nano-silver and nano-gold technology, which is applied in the field of microwave preparation of nano-silver or nano-gold, can solve the problems of reported, unseen microwave preparation methods of nano-silver or nano-gold, and achieves controllable reaction process, regular particle shape, The effect of narrow particle size distribution

Inactive Publication Date: 2009-12-02
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the microwave preparation method of nano-silver or nano-gold

Method used

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  • Microwave preparing method for nanometer silver or gold
  • Microwave preparing method for nanometer silver or gold
  • Microwave preparing method for nanometer silver or gold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the reactor, add 0.01mol / L silver nitrate or chloroauric acid solution and 0.5% sodium carboxymethyl cellulose solution in a ratio of 1:1, add an appropriate amount of secondary distilled water to 200 milliliters of the reaction system; Put it into the microwave reaction chamber and fix it, turn on the magnetic stirrer with a rotating speed of 100 rpm, set the microwave power to 0.3 kilowatts, and react for 7 hours; after the reaction, the solution is air-dried, or vacuum freeze-dried, or spray-dried to obtain nano-silver or Nanogold powder, or nanosilver or nanogold colloid concentrated to the desired concentration by vacuum.

[0024] The electron microscope picture and ultraviolet spectrogram of this nano-silver or nano-gold are as follows: figure 1 , 2 , 3, 4 shown.

Embodiment 2

[0026] In the reactor, add 0.01mol / L silver nitrate or chloroauric acid solution and 1% starch solution in a ratio of 1:1, add an appropriate amount of secondary distilled water to a reaction system of 200 milliliters, add 1 milliliter of 0.01mol / L ammonia water as a catalyst; Put the reactor into the microwave reaction chamber and fix it, turn on the magnetic stirrer with a rotating speed of 100 rpm, set the microwave power to 0.3 kilowatts, and react for 1 hour. After the reaction, adjust the pH of the solution to neutral; after the reaction, the solution is dried by airflow. Or vacuum freeze-drying, or spray drying to prepare nano-silver or nano-gold powder, or vacuum-concentrate to the desired concentration of nano-silver or nano-gold colloid.

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Abstract

The invention discloses a microwave preparation method of nano-silver or nano-gold. Reactants are added into a reactor at a ratio of 1:1. When preparing nano-silver, the reactants are silver nitrate and carbonylmethyl cellulose sodium. When preparing nano-gold The reactants are chloroauric acid and sodium carboxymethyl cellulose; the reactor is put into a microwave reaction chamber, the rotating speed is a stirrer at 100 rpm, the microwave power is 0.3 kilowatts, and the reaction time is It was 7 hours; after the reaction, the solution was air-dried or vacuum freeze-dried or spray-dried to obtain nano-silver or nano-gold powder, or concentrated to a desired concentration of nano-silver or nano-gold colloid. The present invention abandons the conventional reducing agent in the thermochemical synthesis of nano-silver or nano-gold, replaces the traditional local heating method with microwave heating, realizes the homogeneous growth of nano-silver or nano-gold, the particle size distribution of nano-silver or nano-gold is narrow, and the particles Regular shape.

Description

technical field [0001] The invention belongs to the field of metal nanomaterial preparation, and in particular relates to a microwave preparation method of nano silver or nano gold. Background technique [0002] Metal nanomaterials are one of the focuses of material development in the 21st century. Thermochemical method is the current mass production method of nano-silver or nano-gold. Although the thermochemical method has good performance on the stability of nano-silver or nano-gold particles, it is difficult to control the particle size of nano-silver or nano-gold, and it is impossible to obtain pure nano-silver or nano-gold with a narrow particle size distribution. . In addition, traditional reducing agents have certain biological toxicity, and the complex background components bring difficulties to the purification of nano-silver or nano-gold, which greatly limits the application fields of the obtained nano-silver or nano-gold. [0003] Microwave synthesis has the fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 陈静金叶玲钱运华
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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