Electrostatics and metal oxide wettability
Access Status
Fulltext not available
Authors
Hanly, G.
Fornasiero, D.
Ralston, J.
Sedev, Rossen
Date
2011Type
Journal Article
Metadata
Show full item recordCitation
Hanly, G. and Fornasiero, D. and Ralston, J. and Sedev, R. 2011. Electrostatics and metal oxide wettability. Journal of Physical Chemistry C. 115 (30): pp. 14914-14921.
Source Title
Journal of Physical Chemistry C
ISSN
School
Department of Chemical Engineering
Collection
Abstract
The wettability of a titania surface, whose surface was partially covered with a strongly based octadecyltrihydrosilane, was studied above and below the isoelectric point (or pHiep). The advancing water contact angle is at a maximum at the pHiep, decreasing symmetrically on either side in a Lippmann-like manner. The change in wettability, for a given pH, became more pronounced with increasing salt concentration. Using a non-Nernstian model of the electrical double layer, the experimental dependence of contact angle on both pH and salt concentration was satisfactorily predicted.