Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9670560 | Microelectronic Engineering | 2005 | 6 Pages |
Abstract
The natural hydrophobicity of surfaces can be enhanced if they are micro-textured. This is due to air trapped in the structure, which provides the deposited drop with a composite surface made of solid and air on which it is resting. Here, we give evidence for this effect using a forest of micro-pillars which allows us to control the micro structure density under the drop, and thus the degree of super-hydrophobicity. For this purpose, silicon wafers were firstly patterned by conventional photolithography techniques. After deposition of an aluminium layer, the samples were subjected to a deep reactive ion etching (DRIE) with the “Bosch process” in order to achieve high aspect ratios (⩾10). However, this state is not always the most stable situation for a drop on a hydrophobic surface: the drop can also fill up the microstructure. We have been able to observe these two super-hydrophobic states on our surfaces and to characterize advancing and receding contact angles for both of them.
Related Topics
Physical Sciences and Engineering
Computer Science
Hardware and Architecture
Authors
Mathilde Callies, Yong Chen, Frédéric Marty, Anne Pépin, David Quéré,