Slippery rough surfaces

US10434542B2 · kind B2 · utility

Assignee

• The Penn State Research Foundation · US

Inventors

• Xianming Dai · State College, US
• Birgitt Boschitsch · State College, US
• Jing Wang · State College, US
• Tak-Sing Wong · State College, US
• Nan Sun · Beijing, CN

Key dates

• Filing date: Apr 22, 2016
• Grant date: Oct 8, 2019
• Expiry date: Apr 22, 2036

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2995/0093
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

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.