US20070039417A1

US20070039417A1 - Method for preparing nano-complex-powder comprising multiple components and silver

Info

Publication number: US20070039417A1
Application number: US11/206,052
Authority: US
Inventors: Dehuan Huang; Zongquan Li
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-18
Filing date: 2005-08-18
Publication date: 2007-02-22

Abstract

Disclosed is a method for preparing nano-complex-powder comprising multiple components and silver. The method includes the steps of mixing 0.01-5.0% (weight percentage concentration) of silver nitrate solution with 0.001-5.0% of zinc nitrate solution, 0.001-5.0% of iron nitrate solution and 0.001-5.0% of copper nitrate solution, adding adequate amount of surfactant solution, and adding 0.001-1.0% of hydrazine hydrate gradually with stirring, and the solution is mixed for another 10-30 minutes to obtain a solution comprising multiple nano-complex-particle. After inertness, washing and drying at low temperature, the nano-complex-powder comprising multiple components and silver is obtained. The silver content in the product powder is about 40-99.6%, and the particle size is 10-100 nm. An advantage of the present invention is that a nano-complex-powder comprising multiple components and silver is achievable, wherein the particle size is 10-100 nm, and the complex elements and contents are adjustable according to practical requirements and the particle is uniform; raw materials are obtained easily, the process is simple, low cost, and easily industrialized. The application of the nano-complex-powder comprising multiple components and silver is wide and can be used as a nano-antibacteria and special conductive materials. Applications of nano-complex-silver-zinc-copper powder is more effective and broadly due to the coordination in the multiple antibacterial components.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a complex material comprising silver, and more particularly to a nano-complex-powder comprising multiple components and silver.
2. The Prior Arts
Metal silver is effective against microorganisms. The effect for anti-bacteria or sterilization is highly enhanced when the silver particle size is in nano-scale. Nano-silver attracts high attention from scientific and industrial fields both domestically and abroad because of its characteristics of broad and high effect, environmental protection, and causing no side effect. Metals, other than silver, such as zinc and copper, are also effective against microorganisms. Applications of nano-complex-silver-zinc-copper powder are more effective and broadly due to the coordination in the multiply antibacterial components. Additionally, nano-complex-powder comprising multiply components and silver also has a high application value in some special conductive materials.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a method for preparing a nano-complex-powder comprising multiply components and silver. The method comprises the steps of:
(1) Mixing 0.01-5.0% (weight percentage concentration) of silver nitrate solution with 0.001-5.0% of zinc nitrate solution, 0.001-5.0% of iron nitrate solution, and 0.001-5.0% of copper nitrate solution, adding 0.01-5.0% of surfactant solution, and adding 0.001-1.0% of hydrazine hydrate gradually with stirring, a molar ratio of silver nitrate, zinc nitrate, iron nitrate, and copper nitrate, surfactant, and hydrazine hydrate is 1.0:0.001-0.31:0.001-0.48:0.001-0.43:0.001-1.0:0.5-4.5, the addition of hydrazine hydrate solution is stopped when pH value reaches 6.5-7.5, and the solution is mixed for another 10-30 minutes to obtain a solution comprising multiple nano-complex-particles;
(2) Staying the reaction product above for 6-12 hours to allow the nano-silver particles inert, obtaining the nano-complex-powder comprising multiple components and silver after separation, washing and drying at low temperature. The silver content in the product is about 40-99.6%, and the particle size is 10-100 nm.
The advantages of the present invention is that a nano-complex-powder comprising multiple components and silver is achievable, wherein the particle size is 10-100 nm, and the complex elements and contents are adjustable according to practical requirements; raw materials are obtained easily, the process is simple, low cost, and easily industrialized; the application of the nano-complex-powder comprising multiple components and silver is wide and can be used as a nano-antibacteria and special conductive materials. Application of nano-complex-silver-zinc-copper powder is more effective and broadly due to the coordination in the multiple antibacterial components.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a TEM (transmission electron microscope) micrograph of the silver particle according to Example 1 of the present invention.
FIG. 2 shows a TEM micrograph of the silver particle according to Example 2 of the present invention.
FIG. 3 shows a TEM micrograph of the silver particle according to Example 3 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A composition of the nano-complex-powder comprising multiple components and silver is selected from the group consisting of 80.0-99.8% Ag: 0.1-20.0% Zn: 0.001% Fe: 0.001% Cu; 80.0-99.8% Ag: 0.001% Zn: 0.1%-20.0% Fe: 0.001% Cu; 60.0-99.7% Ag: 0.1-20.0% Zn: 0.1-20.0% Fe: 0.001% Cu; 60.0-99.7% Ag: 0.1-20.0% Zn: 0.001% Fe: 0.1-20.0% Cu; 60.0-99.7% Ag: 0.001% Zn: 0.1%-20% Fe: 0.1-20.0% Cu; and 40.0-99.6% Ag: 0.1-20.0% Zn: 0.1-20.0% Fe: 0.1-20.0% Cu.
The surfactant may be sodium lauryl sulfate, sodium dodecyl sulphate, polyvinylpyrrolidone, or sodium polyphosphate. One or more than one of the aforementioned surfactants can be used in the present invention.

EXAMPLE 1

(1) Mix 50 ml of 0.2% (weight percentage concentration) silver nitrate solution with 10 ml of 0.01% zinc nitrate solution, 10 ml of 0.001% iron nitrate solution and 10 ml of 0.001% copper nitrate solution. Next, add 50 ml of 0.1% polyvinylpyrrolidone and 20 ml of 0.1% sodium lauryl sulfate solution into the mixed solution. And, add deionized water to make the solution volume up to 200 ml. Add 200 ml of 0.01% hydrazine hydrate solution into the solution gradually with stirring. The molar ratio of silver nitrate, zinc nitrate, iron nitrate, and copper nitrate, polyvinylpyrrolidone, sodium lauryl sulfate, and hydrazine hydrate is 1.0: 0.18: 0.0007: 0.0009: 0.0085: 0.12:0.68. Addition of hydrazine hydrate solution is stopped when pH value reaches 6.5-7.5. The solution is stirred for another 10-30 minutes continuously to obtain a solution comprising multiple nano-complex-particle.
(2) The reaction product above is stayed for 12 hours to allow the nano-silver particles inert. The nano-complex-powder comprising multiple components and silver is obtained after separation, washing and dry at low temperature. There are 90.1% of silver, 9.8% of zinc, and little amount of iron in the product powder, the average particle size in the powder being 20 nm.

EXAMPLE 2

(1) Mix 50 ml of 0.2% (weight percentage concentration) silver nitrate solution with 11.5 ml of 0.2% zinc nitrate solution, 10 ml of 0.001% iron nitrate solution, and 11.7 ml of 0.2% copper nitrate solution. Next, add 50 ml of 0.1% sodium polyphosphate and 20 ml of 0.1% sodium dodecyl sulphate solution into the mixed solution. And, add deionized water to make the solution volume up to 200 ml. Add 180 ml of 0.015% hydrazine hydrate solution into the solution gradually with stirring. The molar ratio of silver nitrate, zinc nitrate, iron nitrate, and copper nitrate, polyvinylpyrrolidone, sodium lauryl sulfate, and hydrazine hydrate is 1.0: 0.21: 0.0007: 0.21: 0.235: 0.031:0.92. Addition of hydrazine hydrate solution is stopped when pH value reaches 7.0. The solution is stirred for another 15 minutes continuously to obtain a solution comprising multiple nano-complex-particle.
(2) The reaction product above is stayed for 12 hours to allow the nano-silver particles inert. The nano-complex-powder comprising multiple components and silver is obtained after separation, washing and dry at low temperature. There are 79.8% of silver, 10.1% of zinc, 0.2% of iron and 9.9% of copper in the product powder, and the average particle size in the powder is 18 nm.

EXAMPLE 3

(1) Mix 30 ml of 0.8% (weight percentage concentration) silver nitrate solution with 15 ml of 0.5% zinc nitrate solution, 10 ml of 0.5% iron nitrate solution, and 10 ml of 0.001% copper nitrate solution. Next, add 25 ml of 0.5% polyvinylpyrrolidone and 20 ml of 0.5% sodium lauryl sulfate solution into the mixed solution. And, add deionized water to make the solution volume up to 200 ml. Add 200 ml of 0.04% hydrazine hydrate solution into the solution gradually with stirring. The molar ratio of silver nitrate, zinc nitrate, iron nitrate, and copper nitrate, polyvinylpyrrolidone, sodium lauryl sulfate and hydrazine hydrate is 1.0: 0.28: 0.15: 0.0038: 0.0089: 0.25:1.13. Addition of hydrazine hydrate solution is stopped when pH value reaches 7.0. The solution is stirred for another 15 minutes continuously to obtain a solution comprising multiple nano-complex-particle.
(2) The reaction product above is stayed for 12 hours to allow the nano-silver particles inert. The nano-complex-powder comprising multiple components and silver is obtained after separation, washing and dry at low temperature. There are 80.2% of silver, 13.6% of zinc, 6.1% of iron and 0.1% of copper in the product powder, and the average particle size in the powder is 26 nm.

EXAMPLE 4

(1) Mix 20 ml of 0.5% (weight percentage concentration) silver nitrate solution with 18 ml of 0.5% zinc nitrate solution, 27 ml of 0.5% iron nitrate solution and 18 ml of 0.5% copper nitrate solution. Next, add 20 ml of 0.8% polyvinylpyrrolidone and 20 ml of 0.8% sodium lauryl sulfate solution into the mixed solution. And, add deionized water to make the solution volume up to 200 ml. Add 200 ml of 0.055% hydrazine hydrate solution into the solution gradually with stirring. The molar ratio of silver nitrate, zinc nitrate, iron nitrate, and copper nitrate, polyvinylpyrrolidone, sodium lauryl sulfate and hydrazine hydrate is 1.0: 0.81: 0.95: 0.82: 0.027: 0.96:3.71. Addition of hydrazine hydrate solution is stopped when pH value reaches 7.0. The solution is stirred for another 15 minutes continuously to obtain a solution comprising multiple nano-complex-particle.
(2) The reaction product above is stayed for 12 hours to allow the nano-silver particles inert. The nano-complex-powder comprising multiple components and silver is obtained after separation, washing and dry at low temperature. There are 40.7% of silver, 19.9% of zinc, 19.9% of iron and 19.5% of copper in the product powder.

EXAMPLE 5

(1) Mix 5 ml of 0.2% (weight percentage concentration) silver nitrate solution with 20 ml of 0.1% zinc nitrate solution, 20 ml of 0.1% iron nitrate solution and 20 ml of 0.1% copper nitrate solution. Next, add 30 ml of 0.5% polyvinylpyrrolidone and 20 ml of 0.5% sodium lauryl sulfate solution into the mixed solution. And, add deionized water to make the solution volume up to 200 ml. Add 200 ml of 0.015% hydrazine hydrate solution into the solution gradually with stirring. The molar ratio of silver nitrate, zinc nitrate, iron nitrate, and copper nitrate, polyvinylpyrrolidone, sodium lauryl sulfate and hydrazine hydrate is 1.0: 0.18: 0.0141: 0.18: 0.026: 0.62: 1.01. Addition of hydrazine hydrate solution is stopped when pH value reaches 7.0. The solution is stirred for another 15 minutes continuously to obtain a solution comprising multiple nano-complex-particle.
(2) The reaction product above is stayed for 12 hours to allow the nano-silver particles inert. The nano-complex-powder comprising multiple components and silver is obtained after separation, washing and dry at low temperature. There are 77.6% of silver, 8.4% of zinc, 5.7% of iron and 8.3% of copper in the product powder.

Claims

1. A method for preparing nano-complex-powder comprising multiple components and silver, comprising the steps of:

(1) mixing 0.01-5.0% (weight percentage concentration) of silver nitrate solution with 0.001-5.0% of zinc nitrate solution, 0.001-5.0% of iron nitrate solution and 0.001-5.0% of copper nitrate solution, adding 0.01-5.0% of surfactant solution into the mixed solution, and adding 0.001-1.0% of hydrazine hydrate gradually with stirring, molar ratio of the silver nitrate, zinc nitrate, iron nitrate, and copper nitrate, surfactant, and hydrazine hydrate being 1.0: 0.001-0.31: 0.001-0.48: 0.001-0.43: 0.001-1.0: 0.5-4.5, stopping the addition of hydrazine hydrate solution when pH value reaches 6.5-7.5, and mixing the solution for another 10-30 minutes to obtain a solution comprising multiple nano-complex-particle; and

(2) staying the reaction product obtained in step (1) for 6-12 hours to allow nano-silver particles inert, obtaining the nano-complex-powder comprising multiple components and silver after separation, washing and drying at low temperature, wherein the silver content in the product powder is 40-99.6%, and the particle size in the powder is 10-100 nm.

2. The method as claimed in claim 1, wherein composition of the nano-complex-powder comprising multiple components and silver is selected from the group consisting of 80.0-99.8% Ag: 0.1-20.0% Zn: 0.001% Fe: 0.001% Cu, 80.0-99.8% Ag: 0.001% Zn: 0.1%-20.0% Fe: 0.001% Cu, 60.0-99.7% Ag: 0.1-20.0% Zn: 0.1-20.0% Fe: 0.001% Cu, 60.0-99.7% Ag: 0.1-20.0% Zn: 0.001% Fe: 0.1-20.0% Cu, 60.0-99.7% Ag: 0.001% Zn: 0.1%-20% Fe: 0.1-20.0% Cu, and 40.0-99.6% Ag: 0.1-20.0% Zn: 0.1 -20.0% Fe: 0.1-20.0% Cu.