Metal air filter

Patent metadata

Field	Value
Publication number	US-12194476-B2
Application number	US-202117626412-A
Country	US
Kind code	B2
Filing date	Oct 5, 2021
Priority date	Oct 13, 2020
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

The present disclosure relates to a metal air filter including: a filter which is formed of a metallic material by electrodeposition and has a nano branch structure; an ionizer which conducts particles to be captured by the filter with negative charges; and a power supply which supplies a positive voltage for conducting the filter with positive charges and a negative voltage for the ionizer. The filter can be more simply manufactured at a lower cost than a conventional process.

First claim

The invention claimed is:

1. A metal air filter comprising:
a filter which is formed of a metallic material by electrodeposition and has a nano branch structure;
an ionizer which conducts particles to be captured by the filter with negative charges; and
a power supply which supplies a positive voltage for conducting the filter with positive charges and a negative voltage for the ionizer,
wherein the nano branch structure of the filter is formed by induction of bromide ions comprised in an aqueous solution, wherein the bromide ions are included in the aqueous solution by dissolving copper bromide (CuBr 2 ) in a sulfuric acid (H 2 SO 4 ) aqueous solution.

2. The metal air filter of claim 1 , wherein the filter is formed by electrodeposition according to electrolysis in an electrolytic tank which comprises a metal mesh attached to a cathode electrode, a metal plate attached to an anode electrode, and the aqueous solution comprising bromide ions.

3. The metal air filter of claim 2 , wherein the filter is formed by additionally performing a hydrochloric acid washing process.

4. The metal air filter of claim 2 , wherein the positive voltage is 10 V.

5. The metal air filter of claim 2 , wherein a voltage which is applied between the cathode electrode and the anode electrode is 0.7 V.

6. The metal air filter of claim 2 , wherein the aqueous solution comprises copper sulfate and sulfuric acid, and wherein a voltage which is applied between the cathode electrode and the anode electrode is 2.4 V.

7. The metal air filter of claim 2 ,
wherein only one of both sides of the metal plate within the electrolytic tank is opened such that only the one of both sides of the metal plate is involved in an electrochemical reaction for the electrodeposition, and wherein a distance between the metal mesh and the metal plate within the electrolytic tank is set to 5 mm.

8. The metal air filter of claim 1 , wherein the filter is obtained by additionally performing a mechanical compression process on the filter formed by the electrodeposition.

9. The metal air filter of claim 1 , wherein the filter is formed by additionally performing a heat treatment using hydrogen gas on the filter formed by the electrodeposition.

10. The metal air filter of claim 9 , wherein the heat treatment using hydrogen gas is performed by disposing, in a vacuum tube, a graphite plate on which the filter formed by the electrodeposition is disposed, by injecting a mixed gas including hydrogen gas into the vacuum tube, and by applying heat to the vacuum tube.

11. A manufacturing method of a metal filter, the manufacturing method comprising:
connecting a metal mesh in which metal wires are intertwined to a cathode electrode of an electrolytic tank;
connecting a metal plate to an anode electrode of the electrolytic tank;
adding an aqueous solution such that the metal mesh and the metal plate of the electrolytic tank are submerged, wherein the aqueous solution comprises bromide ions by dissolving copper bromide (CuBr 2 ) in a sulfuric acid (H 2 SO 4 ) aqueous solution; and
forming the metal filter having a nano branch structure induced by the bromide ions by performing electrolysis by applying a voltage between the cathode electrode and the anode electrode of the electrolytic tank.

12. The manufacturing method of claim 11 , wherein a voltage which is applied between the cathode electrode and the anode electrode is 0.7 V.

13. The manufacturing method of claim 11 , wherein the aqueous solution further comprises copper sulfate and sulfuric acid, and wherein a voltage which is applied between the cathode electrode and the anode electrode is 2.4 V.

14. The manufacturing method of claim 11 , wherein the forming the filter further comprises connecting nano branches of the filter obtained by the electrolysis to each other and performing a heat treatment using hydrogen gas in order to reduce diameters of the nano branches.

15. The manufacturing method of claim 11 , wherein the forming the filter further comprises performing a hydrochloric acid washing process for removing halogen elements comprised in the filter obtained by the electrolysis.

16. The manufacturing method of claim 11 , wherein the forming the filter further comprises performing a mechanical compression process on the filter obtained by the electrolysis.

17. The manufacturing method of claim 11 , wherein only one of both sides of the metal plate within the electrolytic tank is opened, and wherein a distance between the metal mesh and the metal plate within the electrolytic tank is set to 5 mm.

18. A filter which is used to filter particles comprised in the air, the filter is formed of a metallic material by electrodeposition and has a nano branch structure formed by induction of bromide ions comprised in an aqueous solution provided by an electrolytic tank for the electrodeposition, wherein bromide ions are included in the aqueous solution by dissolving copper bromide (CuBr 2 ) in a sulfuric acid (H 2 SO 4 ) aqueous solution.

19. The filter of claim 18 , wherein the nano branches of the filter are connected to each other by a hydrogen-based heat treatment.

20. The filter of claim 18 , wherein bromide ions used to form the filter is are removed by a hydrochloric acid washing process.

21. The filter of claim 18 , wherein the filter is formed by the electrodeposition and then is mechanically compressed.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Kim San Ha
• Yoo Seunghun
• Yang Inyeong

Classifications

• B01D39/2041

  the material being filamentary or fibrous · CPC title

• B01D39/2027

  Metallic material · CPC title

• C25D7/00

  Electroplating characterised by the article coated · CPC title

• C25D5/50

  by heat-treatment · CPC title

• C25D3/38

  of copper · CPC title