Superhydrophilic filter structure for selectively separating water and oil

Patent metadata

Field	Value
Publication number	US-9650262-B2
Application number	US-201314408319-A
Country	US
Kind code	B2
Filing date	Jun 24, 2013
Priority date	Jun 28, 2012
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A filter structure capable of efficiently separating water and oil using wettability is provided. The filter structure includes a first filter layer including a plurality of openings and a second filter layer including a plurality of openings and positioned so as to be overlapped with the first filter layer at a distance from each other. The first filter layer and the second filter layer include surfaces each having a dual-scale protrusion and depression structure as a combination of a micro-scale structure and a nano-scale structure, and thus have superhydrophilicity and selectively allow water from a water and oil mixture to pass therethrough.

First claim

The invention claimed is:

1. A filter structure comprising:
a first filter layer made of metal and including a plurality of openings; and
a second filter layer made of metal and including a plurality of openings and positioned so as to be overlapped with the first filter layer at a distance from each other,
wherein the first filter layer and the second filter layer include surfaces each having a dual-scale protrusion and depression structure as a combination of a micro-scale structure and a nano-scale structure, and thus have superhydrophilicity and selectively allow water from a water and oil mixture to pass therethrough, and
wherein an absorption layer absorbing and storing water is present between the first filter layer and the second filter layer.

2. The filter structure of claim 1 , wherein each of the first filter layer and the second filter layer is formed of a metal mesh made from a metal wire in the form of a mesh.

3. The filter structure of claim 1 , wherein the protrusion and depression structure includes a first fine protrusion and depression structure formed in a micro-scale and a second fine protrusion and depression structure formed in a nano-scale along curves of the first fine protrusion and depression structure on a surface of the first fine protrusion and depression structure.

4. The filter structure of claim 3 , wherein the first fine protrusion and depression structure is formed by any one method of sandblasting, shot blasting, plasma etching, and a laser treatment.

5. The filter structure of claim 3 , wherein the second fine protrusion and depression structure is formed by an anodic oxidation process.

6. The filter structure of claim 1 , wherein the absorption layer includes at least one selected from hydrogel, silica gel, activated alumina, zeolite, activated carbon, fabric, and sponge.

7. The filter structure of claim 1 , wherein a reinforcing member is present between the first filter layer and the second filter layer.

8. The filter structure of claim 7 , wherein the reinforcing member is formed into any one of a metal rod, a metal mesh, a polymer rod, and a polymer mesh.

Assignees

• Postech Academy-Industry Found

Inventors

• Hwang Woon Bong
• Jo Handong
• Kim Dong Seob
• Kim Yeong Ae

Classifications

• B01D39/10

  Filter screens essentially made of metal · CPC title

• B01D15/08

  Selective adsorption, e.g. chromatography · CPC title

• B01D29/56

  in series connection · CPC title

• C02F1/40 Primary

  Devices for separating or removing fatty or oily substances or similar floating material (cleaning or keeping clear the surface of open water from oil or like materials E02B15/04; devices in sewers for separating liquid or solid substances from sewage E03F5/14, e.g. for use in drains leading to the sewer E03F5/16) · CPC title

• C02F2101/32

  Hydrocarbons, e.g. oil · CPC title