In Langmuir 22, 9765-9769 (2006) we present a model for predicting the streaming-potential profile near a rotating disk immersed in a dilute aqueous electrolyte. This geometry represents a promising new method for determining the zeta potential of flat surfaces (e.g. silicon wafers). We call this new technique ZetaSpin. Since then we have measured streaming potentials which are an order of magnitude larger than for flat surfaces when a 2 mm thick, highly porous sample (e.g. Velcro) is affixed to the rotating disk. A 20x view of Velcro appears below. In this paper, we present a simple model which predicts the enhanced streaming potential arising when a porous layer is affixed to the disk.

Streaming potentials near a rotating disk bearing a thick fuzzy surface layer

242nd National Meeting (2011)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.