# US 10,478,898 B2 · Silver particles manufacturing method

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- Number: US 10,478,898 B2
- Document ID: US10478898B2
- Status: Granted
- Kind: B2
- Application number: 14/961,889
- Filed: 2015-12-08
- Published: 2017-06-08
- Granted: 2019-11-19
- Earliest claimed: 2015-12-08
- Assignees: National Chung Shan Institute of Science and Technology
- Applicants: National Chung-Shan Institute of Science and Technology
- Inventors: Chien-Liang Chang; Wu-Ching Hung; Wei-Jen Liu; Kuei-Ting Hsu; Jhao-Yi Wu; Pin-Chun Lin
- Web page: https://patentgrep.com/patent/US10478898B2

## CPC

- B22F 9/24: starting from liquid metal compounds, e.g. solutions
- B03D 3/00: Differential sedimentation
- B22F 1/054: Nanosized particles
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B03D: FLOTATION; DIFFERENTIAL SEDIMENTATION (sedimentation in general B01D21/00; in combination with other separation of solids B03B; sink-float separation B03B5/28; detergents, soaps C11D)

## Abstract

A silver particles manufacturing method comprises following steps: providing a silver containing compound; providing an organic solution; adding the silver containing compound into the organic solution, to perform ultrasonic vibrations or a heating process until the silver containing compound is dissolved completely into the organic solution, to form a silver ion solution; performing the ultrasonic vibrations or the heating process, and then let the solution settle down for a period, to form a silver particles synthesized solution; and placing the silver particles synthesized solution into a centrifuge to perform centrifugation and separation, to obtain μm-scale silver particles and nm-scale silver particles. The silver particles manufacturing method has the advantages of low pollution, low cost, high yield, and mass production.

## Claims

### Claim 1

A silver particles manufacturing method, comprising following steps:
providing a silver nitrate (AgNO3);
providing a N-Methyl Pyrrolidone (NMP) solution;
adding the silver nitrate (AgNO3) into the N-Methyl Pyrrolidone (NMP) solution, to perform ultrasonic vibrations until the silver containing compound is dissolved completely into the organic solution, to form a silver ion solution, wherein silver ion concentration of the silver ion solution is 0.001M to 10M;
performing the ultrasonic vibrations without additional reducing agent for 2 to 5 hours, and then let the solution settle down for a period, to form a silver particles synthesized solution; and
placing the silver particles synthesized solution into a centrifuge to perform centrifugation and separation, to obtain μm-scale silver particles and nm-scale silver particles,
wherein power of the ultrasonic vibrations is 10 W to 1600 W.

### Claim 2 (depends on 1)

The silver particles manufacturing method as claimed in claim 1, wherein rotation speed of the centrifuge is in a range of 100 rpm to 15000 rpm.

### Claim 3

A silver particles manufacturing method, comprising following steps:
providing a silver nitrate (AgNO3);
providing a N-Methyl Pyrrolidone (NMP) solution;
adding the silver nitrate (AgNO3) into the N-Methyl Pyrrolidone (NMP) solution, to perform ultrasonic vibrations until the silver containing compound is dissolved completely into the organic solution, to form a silver ion solution;
providing a polymer additive for raising yield of the silver particles;
putting the polymer additive into the silver ion solution, to form a silver ion solution containing polymer, wherein silver ion concentration of the silver ion solution is 0.001M to 10M;
performing the ultrasonic vibrations for the silver ion solution containing polymer without additional reducing agent for 2 to 5 hours, and then let it settle down for a period, to form a silver particles synthesized solution; and
placing the silver particles synthesized solution into a centrifuge to perform centrifugation and separation, to obtain μm-scale particles and nm-scale particles,
wherein power of the ultrasonic vibrations is 10 W to 1600 W.

### Claim 4 (depends on 3)

The silver particles manufacturing method as claimed in claim 3, wherein the polymer additive is selected from one of following group consisting of: Polyethylene Terephthalate (PET), Poly (Methyl Methacrylate) (PMMA), Polyvinylidene Fluoride (PVDF), Polyvinyl Alcohol (PVA), Carboxymethyl Cellulose (CMC), Polyamide (PA), Polycarbonate (PC), Polyethylene (PE), Polypropylene (PP), Polystyrene (PS), Polyurethanes (PU), and any combinations of the above.

### Claim 5 (depends on 3)

The silver particles manufacturing method as claimed in claim 3, wherein concentration of the polymer additive is 1 wt % to 3 wt %.

### Claim 6 (depends on 3)

The silver particles manufacturing method as claimed in claim 3, wherein rotation speed of the centrifuge is in a range of 100 rpm to 15000 rpm.