Slippery rough surfaces

Patent metadata

Field	Value
Publication number	US-2018147604-A1
Application number	US-201615568639-A
Country	US
Kind code	A1
Filing date	Apr 22, 2016
Priority date	Apr 24, 2015
Publication date	May 31, 2018
Grant date	—

Abstract

Substrates having a textured surface that can maintain or improve droplet mobility in both the Cassie and Wenzel states include a textured surface and a conformal lubricant layer thereover. The textured surface can include a plurality of raised first elements and a plurality of second elements thereon and the conformal lubricant layer over the plurality of raised first elements and covering the plurality of second elements. The plurality of raised first elements can have an average height of between 0.5 μm and 500 μm, and the plurality of second elements can have an average height of between 0.01 μm and 10 μm. Such substrates can be prepared by texturing a surface of a substrate with a plurality of raised first elements and a plurality of second elements thereon; optionally silanizing the textured surface and applying a lubricant layer over the plurality of raised first elements and between the plurality of second elements.

First claim

1 . A substrate having a textured surface that can maintain droplet mobility in both the Cassie and Wenzel states, the textured surface comprising a plurality of raised first elements and a plurality of second elements thereon and a conformal lubricant layer over the plurality of raised first elements and covering the plurality of second elements.

2 . The substrate of claim 1 , wherein the plurality of second elements have an average height of between 0.01 μm and 10 μm.

3 . The substrate of claim 1 , wherein the plurality of raised first elements have an average height of between 0.5 μm and 500 μm, and wherein the plurality of second elements have an average height of between 0.01 μm and 10 μm.

4 . The substrate of claim 1 , further comprising a silanized coating between the conformal lubricant layer and either the plurality of raised first elements or the plurality of second elements or both.

5 . The substrate of claim 1 , wherein the conformal lubricant layer has a uniform thickness over the plurality of raised first elements.

6 . The substrate of claim 5 , wherein the lubricant is one or more of an oleophobic lubricant, an olephilic lubricant, a hydrophobic lubricant and/or a hydrophilic lubricant.

7 . The substrate of claim 1 , wherein a thickness of the conformal lubricant layer over the plurality of raised first elements is from 0.01 μm to 10 μm.

8 . The substrate of claim 1 , wherein a uniformity of the conformal lubricant layer over the plurality of raised first elements is less than 10 μm.

9 . A device including the substrate of claim 1 .

10 . The device of claim 9 , wherein the devise is a fog harvesting device, heat exchanger, oil-water separation device, or wherein the device includes a drag reduction coating and/or anti-biofouling coating.

11 . A method of preparing a slippery rough surface, the method comprising:
texturing a surface of a substrate with a plurality of raised first elements and a plurality of second elements thereon; and applying a lubricant layer over the plurality of raised first elements and between the plurality of second elements.

12 . The method of claim 1 , further comprising silanizing the textured surface prior to applying the lubricant layer.

13 . The method of claim 11 , wherein the surface of the substrate is a metal, plastic, ceramic, glass or combination thereof.

14 . The method of claim 11 , wherein the plurality of second elements have an average height of between 0.01 μm and 10 μm.

15 . The method of claim 1 , wherein the plurality of raised first elements have an average height of between 0.5 μm and 500 μm, and wherein the plurality of second elements have an average height of between 0.01 μm and 10 μm.

Assignees

• Penn State Res Found

Inventors

• Dai Xianming
• Boschitsch Birgitt M
• Wang Jing
• Wong Tak-Sing
• Sun Nan

Classifications

• B05D5/08 Primary

  to obtain an anti-friction or anti-adhesive surface (rendering particulate materials free-flowing in general, e.g. making them hydrophobic B01J2/30) · CPC title

• B29K2995/0092

  hydrophilic · CPC title

• B29C2059/023

  Microembossing · CPC title

• B05D3/00

  Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials (successively applying liquids or other fluent materials B05D1/36; drying ovens F26B) · CPC title

• B32B3/30

  characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} · CPC title