Center-side method of producing superhydrophobic surface

Patent metadata

Field	Value
Publication number	US-9987818-B2
Application number	US-201515112307-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Jan 16, 2014
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A method for forming a superhydrophobic surface is disclosed. A surface of a first substrate is bonded to a surface of a second substrate to form a stacked material. The stacked material is peeled apart to form a fracture line and provide a superhydrophobic surface.

First claim

What is claimed is:

1. A method for forming a superhydrophobic surface, the method comprising steps of:
laminating a first surface of a first substrate to a second surface of a second substrate to form a stacked material, wherein the first surface comprises a semi-crystalline thermoplastic material having a first melting point and a crosslink density of less than 1%; and
peeling the first substrate and the second substrate apart to form a fracture line, the fracture line within the first substrate thereby transferring a portion of the first substrate to the second substrate and providing a superhydrophobic surface on the second substrate with a water contact angle greater than 130°.

2. The method as recited in claim 1 , wherein the step of peeling occurs at a temperature above 50° C. and below the melting point of the thermoplastic material.

3. The method as recited in claim 1 , wherein a second superhydrophobic surface is disposed on the first substrate after the step of peeling.

4. The method as recited in claim 1 , wherein the second substrate is a rigid substrate with a Young's modulus of at least 1 GPa.

5. The method as recited in claim 1 , wherein the thermoplastic material is a fluoropolymer.

6. The method as recited in claim 1 , further comprising depositing nanoparticles on at least one of the first surface and the second surface prior to the step of laminating.

7. The method as recited in claim 1 , wherein the first substrate comprises a first fluoropolymer and the second substrate comprises a second fluorpolymer, wherein the first fluoropolymer and the second fluoropolymer are different.

8. The method as recited in claim 1 , the method further comprising:
bonding a third surface of a third substrate to a fourth surface of the first substrate, wherein the fourth surface comprises thermoplastic material;
peeling the third substrate and the first substrate apart to form a second fracture line, the second fracture line providing a second superhydrophobic surface having a second water contact angle greater than 130°.

9. The method as recited in claim 1 , wherein the superhydrophobic surface comprises a plurality of filaments with diameters less than 150 nm, lengths of less than 1500 nm and are spaced apart from one another by a pore spacing of less than 500 nm such that the superhydrophobic surface also has anti-reflective properties.

10. The method as recited in claim 1 , wherein the superhydrophobic surface is nanoparticle-free.

11. A method for forming a superhydrophobic surface, the method comprising steps of:
laminating a first surface of a first substrate to a second surface of a second substrate to form a stacked material, wherein the first surface comprises a semi-crystalline thermoplastic material having a first melting point and a crosslink density of less than 1%; and
peeling the first substrate and the second substrate apart to form a fracture line, the fracture line providing a superhydrophobic surface with a water contact angle greater than 130°.

12. The method as recited in claim 11 , wherein the step of peeling occurs at a temperature above 25° C. and below the melting point of the semi-crystalline thermoplastic material.

13. The method as recited in claim 11 , wherein the step of peeling forms structures on the superhydrophobic surface that have an aspect ratio (height:width) greater than 3:1.

14. The method as recited in claim 11 , wherein the first surface is transparent and has a root mean square (RMS) roughness of less than 50 nm.

15. The method as recited in claim 11 , wherein the second surface is transparent and has a root mean square (RMS) roughness of less than 50 nm.

16. The method as recited in claim 11 , wherein the second substrate, after the peeling, is more transmissive than the second substrate prior to the laminating.

Assignees

• Univ City New York Res Found

Inventors

• Lyons Alan M
• Xu Qianfeng

Classifications

• B32B2307/412

  Transparent · CPC title

• B32B7/06

  permitting easy separation · CPC title

• B32B2307/704

  Crystalline · CPC title

• B32B2551/00

  Optical elements · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title