# US 10,503,063 B2 · Super water repellent polymer hierarchical structure, heat exchanger having super water repellency, and manufacturing method therefor

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- Number: US 10,503,063 B2
- Document ID: US10503063B2
- Status: Granted
- Kind: B2
- Application number: 15/507,596
- Filed: 2015-07-22
- Published: 2017-10-05
- Granted: 2019-12-10
- Earliest claimed: 2014-09-01
- Assignees: Industry-University Cooperation Foundation Hanyang University
- Applicants: Industry-University Cooperation Foundation Hanyang University
- Inventors: Dong Rip Kim; Kwan-Soo Lee; Youngjun Cho; Hanmin Jang; Heung Soo Lee
- Web page: https://patentgrep.com/patent/US10503063B2

## CPC

- G03F 7/0002: {Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping}
- B29C 33/60: Releasing, lubricating or separating agents {(in general C10M)}
- B29C 33/62: based on polymers or oligomers
- B29C 35/02: Heating or curing, e.g. crosslinking or vulcanizing {during moulding, e.g. in a mould}(cold vulcanisation B29C35/18 {; vulcanising tyres, presses therefor B29D30/0601})
- B29C 41/00: Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor (with compacting pressure B29C43/00 {; by lay-up of reinforcement of substantial or continuous length B29C70/30})
- B29C 41/08: Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder {(spray-up of reinforcing fibres B29C70/305)}
- B29C 59/005: {characterised by the choice of material}
- F28F 13/18: by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
- F28F 13/185: {Heat-exchange surfaces provided with microstructures or with porous coatings}
- B29C 33/42: characterised by the shape of the moulding surface, e.g. ribs or grooves
- B29C 2035/043: {oil}
- B29C 2059/023: {Microembossing}
- B29K 2995/0093: hydrophobic
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- F28F 19/04: of rubber; of plastics material; of varnish
- F28F 2245/04: hydrophobic
- F28F 2255/20: with nanostructures
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

Provided are a super water repellent polymer hierarchical structure, a heat exchanger having super water repellency, and a manufacturing method thereof A super water repellent polymer hierarchical structure can be simply and repeatedly manufactured by using only a method for utilizing a super water repellent hierarchical structure and mechanically molding a polymer material thereon. In addition, a heat exchanger having super water repellency can be provided by providing super water repellency on the fin surface of a heat exchanger by using a dip method and vacuum drying.

## Claims

### Claim 1

A method for manufacturing a super water-repellent polymer hierarchical structure, comprising:
forming a parent substrate having ratchet structure formed on an upper surface thereof and a super water-repellent nano structure formed on the ratchet structure;
forming a protective layer for preventing the detachment of the super water-repellent nano structure on the super water-repellent nano structure;
applying a liquid polymer on the parent substrate;
curing the applied liquid polymer; and
separating the cured polymer from the parent substrate and washing the separated polymer,
wherein the polymer separated from the parent substrate has a sliding angle of less than 10 degrees, and
wherein the protective layer includes a metallic material or a polymer material.

### Claim 2 (depends on 1)

The method of claim 1, wherein the parent substrate is a metal substrate, a ceramic substrate or a polymer substrate.

### Claim 3 (depends on 1)

The method of claim 1, wherein the forming of a parent substrate includes:
forming a ratchet structure on the upper surface of a substrate; and
forming a super water-repellent nano structure on the ratchet structure.

### Claim 4 (depends on 1)

The method of claim 1, wherein the ratchet structure is characterized by the conditions in which an absolute value of W2−W1 is 50 degrees or more, and
a height of a constituent triangle of a ratchet structure is 100 to 400 μm,
where the W1 is one of the two lower angles of the constituent triangle of the ratchet structure, and the W2 is the other of the two lower angles of the constituent triangle of the ratchet structure.

### Claim 5 (depends on 1)

The method of claim 1, wherein the super water-repellent nano structure is a nanowire structure, a nano sphere structure or a nano hole structure.

### Claim 6 (depends on 1)

The method of claim 1, wherein the forming of a super water-repellent nano structure on the ratchet structure is performed with a hydrothermal synthesis method, a chemical solution etching method or a nano structure application method.

### Claim 7 (depends on 1)

The method of claim 1, wherein the protective layer has a thickness of 20 to 300 nm.

### Claim 8 (depends on 1)

The method of claim 1, wherein the metallic material of the protective layer includes aluminum (Al), gold (Au) or platinum (Pt).

### Claim 9 (depends on 1)

The method of claim 1, wherein the polymer material of the protective layer is polydimethylsiloxane (PDMS), polymethylmethacrylate (PMMA), polyethylene (PE), polyvinylidene fluoride (PVDF), or polyethersulfone (PES).

### Claim 10 (depends on 1)

The method of claim 1, wherein the liquid polymer is polydimethylsiloxane (PDMS), polymethylmethacrylate (PMMA), polypropylene (PP), polyurethane (PU), polyethylene (PE), polyvinylidene fluoride (PVDF), polytetrafluorethylene (PTFE) or polyethersulfone (PES).

### Claim 11

A method for manufacturing a super water-repellent polymer hierarchical structure, comprising:
forming a first parent substrate having a ratchet structure formed on an upper surface thereof and a super water-repellent nano structure formed on the ratchet structure;
forming a protective layer for preventing the detachment of the super water-repellent nano structure on the super water-repellent nano structure;
applying a liquid polymer on the first parent substrate;
curing the applied liquid polymer;
forming a second parent substrate by separating the cured polymer from the first parent substrate and washing the separated polymer;
applying a liquid heterogeneous polymer on the second parent substrate;
curing the applied liquid heterogeneous polymer; and
separating the cured heterogeneous polymer from the second parent substrate and washing the separated polymer,
wherein the separated heterogeneous polymer has a sliding angle of less than 10 degrees and
wherein the protective layer includes a metallic material or a polymer material.

### Claim 12 (depends on 11)

The method of claim 11, wherein the ratchet structure is characterized by an absolute value of W2− W1 is 50 degrees or more, and
a height of a constituent triangle of a ratchet structure is 100 to 400 μm,
where the W1 is one of the two lower angles of the constituent triangle of the ratchet structure, and the W2 is the other of the two lower angles of the constituent triangle of the ratchet structure.

### Claim 13 (depends on 11)

The method of claim 11, wherein the protective layer has a thickness of 20 to 300 nm.

### Claim 14 (depends on 11)

The method of claim 11, wherein the metallic material of the protective layer is aluminum (Al), gold (Au) or platinum (Pt).

### Claim 15 (depends on 11)

The method of claim 11, wherein the polymer material of the protective layer is polydimethylsiloxane (PDMS), polymethylmethacrylate (PMMA), polyethylene (PE), polyvinylidene fluoride (PVDF) or polyethersulfone (PES).