Unlock instant, AI-driven research and patent intelligence for your innovation.

Porous silver powders and method for preparing the same

a technology silver powder, which is applied in the field of porous silver powder, can solve the problems of increasing manufacturing costs, increasing manufacturing costs, and reducing the service life of silver powder, and achieves the effects of improving sterilization effect, improving service life, and specific surface area

Inactive Publication Date: 2022-03-03
KANG JONG GOO
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for easily preparing porous silver powder that has adjustable surface area and porosity for improved sterilization and electrical conductivity when molded. This helps to reduce the use of expensive silver in various industrial fields and increase price competitiveness. Additionally, the porous silver powder is harmless to the human body as the particle size is adjustable to prevent absorption.

Problems solved by technology

However, ink containing silver (Ag) is still expensive and is limited in exhibiting desired performance.
Accordingly, research has been conducted on using inexpensive copper instead of silver but an additional process is needed to maintain an inert gas environment so as to prevent oxidation of copper in a sintering process, thereby increasing manufacturing costs.
However, when the content of expensive silver is increased, manufacturing costs increase and thus research is being conducted to increase a surface area of silver powder per unit mass so as to effectively increase a sterilization effect but there are technical limits in a manufacturing process.
Generally, nano powder is formed to a very small size of less than 100 nm and thus may penetrate the skin, thus causing adverse health effects, and is not likely to be discharged from the body when absorbed into the body due to the very small size.
In particular, when silver nano powder is applied in a medical or bio field, the silver nano powder may be harmful to the human body.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Porous silver powders and method for preparing the same
  • Porous silver powders and method for preparing the same
  • Porous silver powders and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065]silver (Ag) and silicon (Si) were mixed at an atomic ratio of 0.67:1 and dissolved at about 1500° C. to prepare a master alloy. The master alloy was dissolved by melt spinning and rapidly solidified to manufacture an alloy casting. Next, the alloy casting was mechanically ground using a paint shaker to prepare alloy powder with an average particle size D50 of 10 μm.

[0066]100 ml of distilled water and 25 g of NaOH were mixed and then heated at 60° C. The alloy powder was added to the heated basic solution and silicon (Si) was removed to prepare porous silver powder.

example 2

[0067]Porous silver powder was prepared under the same condition as in Example 1 except that silver (Ag) and silicon (Si) were mixed at an atomic ratio of 0.43:1.

example 3

[0068]Porous silver powder was prepared under the same condition as in Example 1 except that silver (Ag) and silicon (Si) were mixed at an atomic ratio of 0.25:1.

[0069]2. Evaluation of Etching Results

[0070]FIGS. 3A and 3B show surfaces of powder of Example 1 observed using a field emission scanning electron microscope (FE-SEM) before and after etching. FIGS. 4A and 4B show surfaces of powder of Example 2 observed before and after etching. FIGS. 5A and 5B show surfaces of powder of Example 3 observed before and after etching. FIGS. 6A and 6B show cross sections of the powder of Example 1 observed after etching.

[0071]Referring to FIGS. 3A to 4B, in Examples 1 and 2, alloy powder was etched and cleaned using a sodium hydroxide solution and thus silicon (Si) was almost removed and only silver (Ag) remained in porous silver powder.

[0072]FIGS. 5A and 5B are photographs showing a surface of porous silver powder of Example 3 of the present invention, observed using the FE-SEM. Referring to ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is a porous silver powder and a preparation method thereof. More specifically, the present invention relates to porous silver powder that is easy to prepare, improves a sterilization effect because an specific surface area and a porosity are easily adjustable, improves electrical conductivity when molded as sintered body, contributes to reducing use of expensive silver when applied in various industrial fields, thus achieving price competitiveness, and is harmless to the human body because a particle size is adjustable to prevent the porous silver powder from being absorbed into the body; and a preparation method thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of Korean Patent Application No. 10-2020-0110160, filed with the Korean Intellectual Property Office on Aug. 31, 2020, the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to porous silver powder and a preparation method thereof. More specifically, the present invention relates to porous silver powder that is easy to prepare, improves a sterilization effect because an specific surface area and a porosity are easily adjustable, improves electrical conductivity when molded as sintered body, contributes to reducing use of expensive silver when applied in various industrial fields, thus achieving price competitiveness, and is harmless to the human body because a particle size is adjustable to prevent the porous silver powder from being absorbed into the body; and a preparation method thereof.BACKGROUND ART[0003]Silver (Ag) powd...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): B22F1/00B22F9/04C22C1/03
CPCB22F1/0018B22F9/04C22C1/03B22F1/0081B22F2304/058B22F2009/041B22F2304/056B22F2304/15B22F2304/10B22F2301/255C22C1/0466B22F1/05B22F1/056B22F1/145B22F2998/10B22F1/07B22F1/08
Inventor KANG, JONG GOO
Owner KANG JONG GOO