This work presents the development of a wettability switching membrane device using the surface roughness effect. We designed and fabricated a roughness switchable membrane device, consisting of a thin poly(dimethylsiloxane) (PDMS) membrane bonded on the top of a rough PDMS substrate. A thin (less than 2 μm) PDMS membrane fabrication technique was developed. The membrane device was tested and it was found that the surface wettability can be switched from medium hydrophobic to superhydrophobic states by deflecting the membrane with a pneumatic method. The reported mechanism is the first demonstration of a wettability switching mechanism using surface roughness modification. Theoretical analysis was used to explain experimental results.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering