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Method for preparing gold nano microgranule powder

An ultra-fine particle and nano-gold technology, which is applied in the field of preparation of nano-gold ultra-fine particle powder, can solve the problems of increased cost, complicated process, difficult removal of passivating agents, etc.

Inactive Publication Date: 2006-07-26
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole process is complicated, the cost increases, and the loss of gold is inevitable, and the passivation agent is not easy to remove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0028] In a beaker containing 10ml of 6.3mmol / L PVP ethanol solution, add 4.2ml of 0.59mmol / L chloroauric acid aqueous solution, then add 5ml of double distilled water, fully stir and cool in an ice bath, and add dropwise under rapid stirring 0.2mol / L sodium hydroxide aqueous solution 0.3ml. The molar ratio of PVP to gold is 26:1, the molar ratio of sodium hydroxide to gold is 24:1, and the molar ratio of methanol to water is 1:1. Then transfer to a 100ml round bottom flask, install a reflux device, heat and reflux with full power microwave (output power 750W) for 5 minutes to obtain a purple gold sol, cool at room temperature, and the absorption peak of the ultraviolet-visible absorption spectrum is 542nm. Vacuum rotary evaporator evaporation and drying A powdery product was obtained.

Embodiment 2

[0030] In a beaker filled with 10ml 3mmol / L PVP ethylene glycol solution, add 0.2ml of 17.8mmol / L chloroauric acid aqueous solution, then add 10ml of double distilled water, fully stir and cool in an ice bath, quickly stir and drop Add 0.11ml of 0.2mol / L sodium hydroxide aqueous solution. The molar ratio of PVP to gold is 8:1, the molar ratio of sodium hydroxide to gold is 6:1, and the molar ratio of methanol to water is 1:1. Then transfer to a 100ml round bottom flask, install a reflux device, heat and reflux with full power microwave (output power 750W) for 5 minutes to obtain a blue gold sol, cool at room temperature, and the absorption peak of the ultraviolet-visible absorption spectrum is 592nm. Vacuum rotary evaporator evaporation and drying A powdery product was obtained.

Embodiment 3

[0032] In a beaker containing 4.9ml of 24mmol / L PVP methanol solution, add 4ml of 0.59mmol / L chloroauric acid aqueous solution, then add 5ml of anhydrous methanol, fully stir and cool in an ice bath, add 4.7ml dropwise under rapid stirring 4mmol / L sodium hydroxide aqueous solution. The molar ratio of PVP to gold is 50:1, the molar ratio of sodium hydroxide to gold is 8:1, and the molar ratio of methanol to water is 1:1. Then transfer to a 100ml round-bottomed flask, install a reflux device, heat and reflux with full-power microwave (output power 750W) for 10 minutes to obtain purple gold sol, cool at room temperature, and the absorption peak of the ultraviolet-visible absorption spectrum is 556nm. Evaporate and dry in a vacuum rotary evaporator to obtain Powdered product. The average particle size of gold powder is 17nm. The maximum and minimum particle size deviation is ≤5nm.

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Abstract

The invention discloses the method for preparation of nanometer gold ultramicron powders, comprising the following steps: 1 mixing the polyvinyl pyrrolidon solution and chlorauric acid solution; 2 adding natrium hydroxydatum solution; 3 heating with microwave, getting the nanometer gold sol; 4 evaporating it with vacuum rotatory evaporator and getting nanometer gold ultramicron powders. The method possesses the advantages of low cost, simple technology and wide applications.

Description

technical field [0001] The invention relates to a preparation method of nano gold ultrafine particle powder. Background technique [0002] Gold is the metal with the most stable chemical properties and the best electrical conductivity in nature. Nano-sized gold particles are rapidly developing in applications, and their unique optical and electrical properties have irreplaceable and important application values ​​in many fields. Moreover, gold sol has good stability, and its beautiful color and antibacterial function have attracted people's attention. In the 13th century, gold was regarded as a panacea for all kinds of diseases, and this situation continued until the late 18th century. Because there was no biochemical basis at that time, the credibility of gold therapy was very low. It was not until this century that gold's chemotherapy was gradually considered scientific. In recent years, eating gold has become popular in some areas, and gold leaf and gold powder are dir...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 李明珠刘汉范宋延林江雷
Owner INST OF CHEM CHINESE ACAD OF SCI
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