Abstract
In this paper, a measurement technique based on the capillary penetration method is presented for use in estimating the wettability properties of gas diffusion media (GDM), a component for proton exchange membrane fuel cells (PEMFCs). The present method solves several critical issues, including the formation of an external meniscus and the evaporation of imbibed solvent, both of which greatly affect the apparent rate of solvent imbibition. Solvent evaporation is prevented by inserting a GDM sample between two thin stainless steel plates to form a tri-layer structure having non-porous evaporation covers on each side of the porous GDM sample. The presence of stainless steel plates in contact with the GDM sample was demonstrated to have a negligible impact on the evaluation of the Washburn material constant.
| Original language | English |
|---|---|
| Pages (from-to) | 577-580 |
| Number of pages | 4 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 350 |
| Issue number | 2 |
| DOIs | |
| State | Published - Oct 2010 |
Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry
Keywords
- Evaporation
- External meniscus
- Gas diffusion media
- Internal contact angle
- Proton exchange membrane fuel cells
- Wettability properties