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Microwave preparing method for nanometer silver or gold

A nano-silver and microwave technology, which is applied in the field of microwave preparation of nano-silver or gold, can solve the problems such as the microwave preparation method of nano-silver or gold that has not been seen, and achieves a uniform particle shape, narrow particle size distribution, and controllable reaction process. Effect

Inactive Publication Date: 2008-02-13
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 gold

Method used

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  • Microwave preparing method for nanometer silver or gold

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Effect test

Embodiment 1

[0023] Add 0.01 mol / L silver nitrate or chloroauric acid solution and 0.5% sodium carboxymethyl cellulose solution in the reactor at a ratio of 1:1, add an appropriate amount of twice distilled water to the reaction system to be 200 ml; put the reactor Put it into the microwave reaction chamber and fix it, turn on a magnetic stirrer with a rotating speed of 100 rpm, set the microwave power to 0.3 kW, and react for 7 hours; after the reaction, the solution is dried by airflow, or vacuum freeze-dried, or spray-dried to prepare nano silver or Gold powder, or nano-silver or gold colloid concentrated to the desired concentration by vacuum.

[0024] The electron micrographs and ultraviolet spectra of the nano silver or gold are shown in Figures 1, 2, 3, and 4.

Embodiment 2

[0026] Add 0.01mol / L silver nitrate or chloroauric acid solution and 1% starch solution in the reactor at a ratio of 1:1, add an appropriate amount of twice distilled water to the reaction system to reach 200ml, and add 1ml 0.01mol / L ammonia as a catalyst; Place the reactor in a microwave reaction chamber and fix it, turn on a magnetic stirrer with a rotating speed of 100 rpm, set the microwave power to 0.3 kW, 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 gold powder, or vacuum concentration to a desired concentration of nano-silver or gold colloid.

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Abstract

The present invention discloses a microwave producing method for nano-silver or gold; the reactants are added into the reactor according to the proportion of 1 to 1; the reactants are silver nitrate or auric chloride acid and starch or sodium carboxymethyl cellulose; the reactor is put into a microwave oven; with a mixer of a rotation speed of 100 / min and the microwave power of 0.3 Kw, the reaction time of the reactant starch is one hour while the time of the reactant sodium carboxymethyl cellulose is seven hours; the solution is dried by air or vacuum freeze or spraying after the reaction is over to produce nano-silver or gold powder or concentrated to nano-silver or gold colloid of the needed consistency through vacuum concentration. The present invention discards the ordinary reducing agent in thermochemical synthesis and takes the microwave heating to replace the traditional local heating method and realize homogeneous growing of nano-silver or gold; the grain size distribution of the nano-silver and gold is narrow and the grain shapes are regular; the method is widely used in biochemical and antiseptic material field.

Description

Technical field [0001] The invention belongs to the field of metal nano material preparation, and specifically relates to a microwave preparation method of nano silver or gold. Background technique [0002] Metal nanomaterials are one of the focuses of material development in the 21st century. The thermochemical method is currently a popular large-scale production method of nano-silver or gold. Although the thermochemical method has good performance on the stability of nano silver or gold particles, it is difficult to control the particle size of nano silver or gold, and it is impossible to obtain pure nano silver or gold with a narrow particle size distribution. In addition, traditional reducing agents have certain biological toxicity, and complex background components bring difficulties to the purification of nano-silver or gold, which greatly limits the application fields of the obtained nano-silver or gold. [0003] Microwave synthesis has the following advantages: (1) Mild c...

Claims

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Application Information

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