Entegris, Inc.

Michael Wright

Charles W Extrand

A fluid handling device with an anisotropic wetting surface including a substrate with a multiplicity of asymmetric substantially uniformly shaped asperities thereon. Each asperity has a first asperity rise angle and a second asperity rise angle relative to the substrate. The asperities are structured to present a desired retentive force ratio (f/f) greater or less than unity caused by asymmetry between the first asperity rise angle and the second asperity rise angle according to the formula: f/f=sin(&#x3c9;+&#xbd;&#x394;&#x3b8;)/sin(&#x3c9;+&#xbd;&#x394;&#x3b8;).

Fluid handling device with directionally-biased wetting surface

A microfluidic device having durable ultraphobic fluid contact surfaces in the fluid flow channels of the device. The ultraphobic surface generally includes a substrate portion with a multiplicity of projecting regularly shaped microscale or nanoscale asperities disposed in a regular array so that the surface has a predetermined contact line density equal to or greater than a critical contact line density, and so that the ratio of the cross-sectional dimension of the asperities to the spacing dimension of the asperities is less than or equal to 0.1.

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Portland, OR, United States of America

Michael Wright