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Method for preparing spherical nano silver powder

A technology of spherical nano-silver and silver nitrate, which is applied in the field of preparation of spherical nano-silver powder, can solve the problems of no further purification, and achieve the effect of regular shape, smooth surface and high process yield

Inactive Publication Date: 2008-07-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (2) Using analytically pure silver nitrate as the experimental raw material, without further purification, a solution was prepared with deionized water
But adopt the relevant report of spray pyrolysis method to prepare nano-silver powder and have not seen so far

Method used

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  • Method for preparing spherical nano silver powder
  • Method for preparing spherical nano silver powder
  • Method for preparing spherical nano silver powder

Examples

Experimental program
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Effect test

Embodiment 1

[0028] As shown in Figure 1, 10 grams of silver nitrate (AgNO 3 ) and 1208 grams of magnesium nitrate {Mg(NO 3 ) 2} The raw material was dissolved in 10962 ml of distilled water, sprayed and pyrolyzed in an air atmosphere at 600°C, the flow rate of the solution was 336 ml / hour, and the flow rate of the carrier gas was 0.28 MPa to make a composite precursor powder of silver and magnesium oxide, which was placed in the solution In 100 milliliters of absolute ethanol solutions with 1 gram of protective agent and dispersant polyvinylpyrrolidone, adopt ultrasonic dispersion for 10 minutes (stirring with a magnetic stirrer) to obtain a mixture; prepare a hydrochloric acid solution with a mass concentration of 5%, and add it dropwise to the mixture During the process, adjust the pH value to 3; after the dropwise addition, after the powder in the solution was suction filtered, after 2 washings with absolute ethanol and vacuum drying, the temperature of the vacuum drying was controlle...

Embodiment 2

[0031] 50 g of silver nitrate (AgNO 3 ) and 302 grams of magnesium nitrate {Mg(NO 3 ) 2} The raw material was dissolved in 528 ml of distilled water, sprayed and pyrolyzed in an air atmosphere at 800°C, the flow rate of the solution was 500 ml / hour, and the flow rate of the carrier gas was 0.32 MPa to make a composite precursor powder of silver and magnesium oxide, which was placed in the solution In 100 milliliters of dehydrated ethanol solutions of 5 grams of protective agent and dispersant polyvinylpyrrolidone, adopt ultrasonic dispersion for 30 minutes (using magnetic stirrer to stir), obtain mixture; Configuration mass concentration is 15% sulfuric acid solution, add dropwise to mixture During the process, adjust the pH value to 3; after the dropwise addition, after the powder in the solution was suction filtered, after washing 3 times with absolute ethanol and vacuum drying, the temperature of the vacuum drying was controlled at 70°C to obtain spherical nano-silver powd...

Embodiment 3

[0033] 50 g of silver nitrate (AgNO 3 ) and 3424 grams of nickel nitrate {Ni(NO 3 ) 2} The raw material was dissolved in 13896 ml of distilled water, sprayed and pyrolyzed in an air atmosphere at 800°C, the flow rate of the solution was 500 ml / hour, and the flow rate of the carrier gas was 0.32 MPa to make a composite precursor powder of silver and nickel oxide, which was placed in the solution In 100 milliliters of absolute ethanol solutions of 5 grams of protective agent and dispersant polyvinylpyrrolidone, adopt ultrasonic dispersion for 30 minutes (stirring with a magnetic stirrer) to obtain a mixture; configure a mass concentration of 10% ammonium chloride solution, add dropwise into the mixture, and adjust the pH value to 4; after the dropwise addition, the powder in the solution is suction-filtered, washed with absolute ethanol three times, and vacuum-dried, and the temperature of the vacuum-drying is controlled at 70°C to obtain spherical nano-silver powder (Particle...

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Abstract

The invention relates to a method for preparing a spherical nanometer sliver powder. A method for preparing a spherical nanometer sliver powder is characterized in that the invention includes the following steps: 1) spraying and pyrolyzing: a, dissolving silver nitrate with one of the three: {1}magnesium nitrate, {2}nickel nitrate, {3}copper nitrate into water to prepare into a water liquor with a consistency of 10 to 40wt percent; the mol ratio of magnesium ion, nickel ion or copper ion in the liquor is 0.05 to 1 :4; then spraying for pyrogenation; b, under the existence of a dispersant and protecting agent, adding into a non-water ethanol to disperse to acquire a mixture; 2) preparing the spherical nanometer sliver powder: a, dripping acid liquor into the mixture and adjusting a PH value between 3 to 5 to acquire a suspension containing the spherical nanometer sliver powder; b, pumping filtration, washing and drying to acquire the spherical nanometer sliver powder. The preparing method is simple and easy to be controlled, has no pollution and low cost, is suitable for industrialization scale production. The prepared spherical nanometer sliver powder belongs to the nanometer grade and the powder has uniform distribution of the grain diameter, regular shape and high yield.

Description

technical field [0001] The invention relates to a preparation method of spherical nanometer silver powder. Background technique [0002] Silver atomic number 47, atomic weight 107.9, peripheral electron configuration 4d 10 5s 1 , located in Group IB of the fifth cycle. The atomic radius is 144.4 picometers, the radius of Ag is 126 picometers, the first ionization energy is 735kJ / mol, and the electronegativity is 1.9. Has good ductility and thermal conductivity. Density 10.5g / cm 3 , melting point 961.93°C, boiling point 2213°C. It is chemically stable, does not react with oxygen and water, does not react with hydrochloric acid, dilute sulfuric acid and strong alkali. Soluble in nitric acid or hot concentrated sulfuric acid. It is soluble in potassium cyanide solution in the presence of air and oxygen, and can react with sulfur or hydrogen sulfide. With the deepening of research on nanomaterials, the special properties of various nanoparticles have been gradually under...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 史晓亮王盛段兴龙赵晓峰张文俊杨华章桥新
Owner WUHAN UNIV OF TECH
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