Super water-repellent layer structure on which droplets can move in one direction and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2017233586-A1
Application number	US-201415323209-A
Country	US
Kind code	A1
Filing date	Dec 8, 2014
Priority date	Jul 1, 2014
Publication date	Aug 17, 2017
Grant date	—

Abstract

Provided is a super water-repellent layer structure. The super water-repellent layer structure comprises a substrate having a ratchet structure formed on the upper surface thereof and a super water-repellent nanowire structure formed on the ratchet structure, wherein water drops can move in one direction without an external force. A super water-repellent layer structure can be provided which enables water drops to move in one direction using the ratchet structure and the super water-repellent nanowire structure even without force applied from the outside in a state in which the surface thereof is hardly inclined. Thus, such a super water-repellent layer structure can be applied to various industries such as water harvesting, drainage of condensation water of a heat exchanger, etc., a microfluidic industry.

First claim

1 . A super water-repellent layer structure, comprising:
a substrate having a ratchet structure formed on an upper surface thereof; and a super water-repellent nanowire structure formed on the ratchet structure, wherein water droplets can move in one direction on the substrate without an aid of an external force.

2 . The super water-repellent layer structure of claim 1 , wherein water droplets can move in one direction on the substrate without an aid of an external force, even when a surface of the substrate is inclined by 5° or less.

3 . The super water-repellent layer structure of claim 1 , wherein the ratchet structure satisfies conditions in which an absolute value of W 2 −W 1 is 50° or more and a height of a constituent triangle of the ratchet structure is 100 μm to 400 μm,
wherein W 1 is any one of two angles at a bottom of the constituent triangle of the ratchet structure, and W 2 is the other of the two angles at the bottom of the constituent triangle of the ratchet structure.

4 . The super water-repellent layer structure of claim 1 , wherein the super water-repellent nanowire structure contains at least one selected from the group consisting of CuO, Cu 2 O, CeO 2 , and Co 3 O 4 , and attains a super water-repellent characteristic through the synthesis of a nanowire structure followed by vacuum drying.

5 . The super water-repellent layer structure of claim 1 , wherein the super water-repellent nanowire structure contains at least one selected from the group consisting of ZnO, TiO 2 , Fe 2 O 3 , Al 2 O 3 , and SiO 2 , and is provided with a water-repellent coating thereon.

6 . The super water-repellent layer structure of claim 5 , wherein the water-repellent coating is prepared using a fluorine-based material or silane-based material.

7 . A method of manufacturing a super water-repellent layer structure, comprising:
a process of preparing a substrate including a ratchet structure formed on an upper surface thereof; and a process of forming a super water-repellent nanowire structure on the ratchet structure, wherein water droplets are able to move in one direction on the substrate without an aid of an external force, even when a surface of the substrate is inclined by 5° or less.

8 . The method of claim 7 , wherein the ratchet structure satisfies conditions in which an absolute value of W 2 −W 1 is 50° or more and a height of a constituent triangle of the ratchet structure is 100 μm to 400 μm, wherein W 1 is any one of two angles at a bottom of the constituent triangle of the ratchet structure, and W 2 is the other of the two angles at the bottom of the constituent triangle of the ratchet structure.

9 . The method of claim 7 , wherein the process of forming a super water-repellent nanowire structure on the ratchet structure includes:
forming a nanowire structure on the ratchet structure through hydrothermal synthesis, chemical vapor deposition, or electrochemical deposition; and subsequently forming the super water-repellent nanowire structure by performing vacuum drying or applying, using a fluorine-based material or silane-based material, a water-repellent coating on the nanowire structure that has been prepared above.

Assignees

• Industry-Univ Coop Found Hanyang Univ

Inventors

• Kim Dong Rip
• Lee Kwan-Soo
• Cho Youngjun
• Lee Kyuho
• Jun Jihyun

Classifications

• C09K3/18

  for application to surfaces to minimize adherence of ice, mist or water thereto (rendering particulate materials free flowing, in general, e.g. making them hydrophobic B01J2/30); Thawing or antifreeze materials for application to surfaces (used in liquids for heat-transfer, heat-exchange or heat-storage or for the production of heat or cold other than by combustion, e.g. radiator liquids, C09K5/00) · CPC title

• C09D5/1681 Primary

  Antifouling coatings characterised by surface structure, e.g. for roughness effect giving superhydrophobic coatings or Lotus effect · CPC title

• C23C16/56

  After-treatment · CPC title

• C25D9/12

  on light metals · CPC title

• C25D5/48

  After-treatment of electroplated surfaces · CPC title