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Process for manufactruing superfine nano noble metal solution

A precious metal and manufacturing method technology, applied in the field of manufacture of ultra-fine nano-precious metal solutions, can solve the problems of low purity and large particle radius, etc.

Inactive Publication Date: 2007-11-28
徐健宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Features: Simple and easy, but low purity, large particle radius, suitable for preparing nano oxides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Dissolve 1-100 grams of polyvinylpyrrolidone (PVP) in 500-900 ml of distilled water, heat to 50-100°C and stir until completely dissolved, then add 0.1-40 grams of silver nitrate into the polyvinylpyrrolidone solution, and stir for 0-100°C After 600 minutes, a stable silver ion-PVP dispersion solution is formed. Slowly add 0.1-500ml of 0.1-100wt% vitamin C aqueous solution under vigorous stirring at 10-70°C. Stir for about 0-600 minutes to form a golden yellow Transparent nano-silver solution, add 1-100 ml of 0.1-20wt% sodium triiodide aqueous solution dropwise to the silver ion-PVP dispersion solution, stir for about 0-600 minutes to obtain almost colorless and transparent ultra-fine nano-silver aqueous solution.

Embodiment 2

[0051] As in Example 1, after generating the golden yellow nano-silver solution, add 0.1% to 100% hydrogen peroxide, chlorite, hypochlorite, persulfate, potassium hydrogen persulfate, periodate, iodine solution or Bromine water and other oxidizing agents are used instead of sodium triiodide aqueous solution, and the terminal oxidation potential value is controlled at 0±100mV to obtain a nearly colorless and transparent nano-silver solution.

Embodiment 3

[0053] Dissolve 1-100 grams of polyvinyl alcohol (PVA) in 500-900 ml of distilled water, heat to 50-100°C and stir until completely dissolved, then add 0.1-40 grams of silver nitrate into the polyvinyl alcohol solution, stir for 0 After ~600 minutes, a stable silver ion-PVA dispersion solution is formed. Slowly add 0.1~500 ml of 0.1~100wt% sodium tetraborate (borax) aqueous solution under vigorous stirring at 10~70°C, and stir for about 0~600 After 10 minutes, 1-100 milliliters of 0.1-10 wt % sodium borohydride aqueous solution is added dropwise to the silver ion-PVA dispersion solution, and after stirring for about 0-600 minutes, an almost colorless and transparent ultrafine nano-silver aqueous solution is obtained.

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Abstract

The process of preparing nanometer noble metal solution is one chemical reduction process to reduce Cu, Ag or Au ion stabilized with different dispersant into nanometer Cu, Ag or Au particle while adding various kinds of protecting agent to inhibit the agglutination of nanometer particle. The process can prepare superfine nanometer noble metal solution of average granularity smaller than 5 nm and with high stability and greatly raised tolerance to acid, alkali, oxygen, light and heat, and the superfine nanometer noble metal solution has altered physical characteristic and expanded application range.

Description

technical field [0001] The invention relates to a method for manufacturing an ultra-fine nano-precious metal solution, which specifically refers to adding various protective agents during the preparation process to inhibit the aggregation of nano-copper, silver, and gold particles, thereby preparing ultra-fine nano The method of copper, silver, gold and other precious metal solutions. Background technique [0002] At present, nano preparation technology is nothing more than physical method and chemical method. The comparison of its advantages and disadvantages is as follows: [0003] (1) Physical methods, which include: [0004] A. Vacuum condensation method: use vacuum evaporation, heating, high-frequency induction and other methods to vaporize raw materials or form equal particles, and then quench. [0005] Features: high purity, good crystal structure, controllable particle size, but high technical and equipment requirements. [0006] B. Physical pulverization method: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 徐健宏
Owner 徐健宏
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