Micro-structure and nano-structure replication methods and article of manufacture

• US 10,131,086 B2
• Filed: 06/28/2012
• Issued: 11/20/2018
• Est. Priority Date: 06/30/2011
• Status: Active Grant

• Current Assignee: University of Virginia Patent Foundation (University of Virginia)
• Original Assignee: University of Virginia Patent Foundation (University of Virginia)
• Inventors: Gupta, Mool C., Nayak, Barada K., Caffrey, Paul O.
• Primary Examiner(s): Thrower, Larry W
• Application Number:
  US13/536,695
• Publication Number:
  US 20130189485A1
• Time in Patent Office: 2,336 Days
• Field of Search: 264319
• CPC Class Codes: B29C 2059/023 Microembossing
• CPC Class Codes: B29C 59/02 by mechanical means, e.g. pressing B29C59/007 takes precedence; embossing expanded porous articles B29C44/5627
• CPC Class Codes: B29C 59/022 characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
• CPC Class Codes: B29D 11/00 Producing optical elements, e.g. lenses or prisms grinding or polishing of optical elements B24B; constructional form of optical elements G02B; optical parts of spectacles G02C7/00
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Abstract

A method for the replication of a textured surface of a master is disclosed, in which the textured surface of the master is comprised of micron-scale cones having nano- or micro-scale surface features. Alternatively, the master may be comprised of micron-scale structures, nano-scale structures, and micron scale structures having nano-scale surface features. Replication can be achieved through a molding or embossing technique. Using these technique, the textured surface of the master is faithfully replicated onto the surface of the replica. A number of representative materials and additional processing steps are also disclosed. The replicated texture exhibits many useful properties, including enhanced hydrophobicity and reduced light reflection properties, making the disclosed method a simple and attractive alternative to existing texturing techniques.

Claims

1. A method for replicating at least one textured surface, said method comprising the following steps:

providing at least one master having at least one textured surface with microtexture cones, wherein said microtextured cones of said at least one master includes nanoscale features on surfaces of said microtexture cones of said at least one master;

providing at least one substrate;

providing at least one replicating material, wherein said at least one replicating material is in communication with said at least one substrate;

placing said at least one textured surface of said at least one master in contact with said at least one replicating material;

applying an embossing force to the combination of said at least one master, said at least one replicating material, and said at least one substrate;

heating at least one of said at least one master, said at least one replicating material, and said at least one substrate;

reducing or eliminating said heating;

removing said embossing force;

separating said at least one master from said at least one replicating material to provide a replica of said at least one textured surface with microtexture cones of said at least one master, wherein said microtexture cones of said replica includes nanoscale features on surfaces of said microtexture cones of said replica, wherein said nanoscale features of said replica are the result of correctly replicating said at least one master;

wherein said separating step directly provides said replica without any additional processing steps to accomplish said replica, and wherein said surface of said replica is superhydrophobic.

2. The method of claim 1, wherein said superhydrophobic replica provides an anti-icing component.

3. The method of claim 1, wherein said superhydrophobic replica provides a self-cleaning component.

4. The method of claim 1, wherein said surface of said replica has decreased reflectivity after said removal.

5. A method for replicating at least one textured surface, said method comprising the following steps:

providing at least one master having at least one textured surface with microtexture features, wherein said microtexture features of said at least one master include nanoscale features on surface of said microtexture feature of said at least one master;

providing at least one substrate;

providing at least one replicating material, wherein said at least one replicating material is in communication with said at least one substrate;

placing said at least one textured surface of said at least one master in contact with said at least one replicating material;

applying an embossing force to the combination of said at least one master, said at least one replicating material, and said at least one substrate;

heating at least one of said at least one master, said at least one replicating material, and said at least one substrate;

reducing or eliminating said heating;

removing said embossing force;

separating said at least one master from said at least one replicating material to provide a replica of said at least one textured surface with microtexture features of said at least one master, wherein said microtexture features of said replica include nanoscale features on surface of said microtexture features of said replica, wherein said nanoscale features of said replica are the result of the correctly replicating said at least one master;

wherein said separating step directly provides said replica without any additional processing steps to accomplish said replica, and wherein said surface of said replica is superhydrophobic.

6. The method of claim 5, wherein said nanoscale features of said at least one master comprises a grating or wires.