Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/13989
Title: Evidence for phase separation of ethanol-water mixtures at the hydrogen terminated nanocrystalline diamond surface
Authors: JANSSENS, Stoffel 
DRIJKONINGEN, Sien 
SAITNER, Marc 
BOYEN, Hans-Gerhard 
WAGNER, Patrick 
Larsson, Karin
HAENEN, Ken 
Issue Date: 2012
Source: JOURNAL OF CHEMICAL PHYSICS, 137 (4), (ART N° 044702)
Abstract: Interactions between ethanol-water mixtures and a hydrophobic hydrogen terminated nanocrystalline diamond surface, are investigated by sessile drop contact angle measurements. The surface free energy of the hydrophobic surface, obtained with pure liquids, differs strongly from values obtained by ethanol-water mixtures. Here, a model which explains this difference is presented. The model suggests that, due to a higher affinity of ethanol for the hydrophobic surface, when compared to water, a phase separation occurs when a mixture of both liquids is in contact with the H-terminated diamond surface. These results are supported by a computational study giving insight in the affinity and related interaction at the liquid-solid interface.
Notes: Janssens, SD (reprint author), Hasselt Univ, Inst Mat Res IMO, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. stoffel.janssens@uhasselt.be; ken.haenen@uhasselt.be
Keywords: alcohol-water; surface free energy; nanocrystalline diamond; contact angle; surface chemistry
Document URI: http://hdl.handle.net/1942/13989
ISSN: 0021-9606
e-ISSN: 1089-7690
DOI: 10.1063/1.4738192
ISI #: 000307611500050
Rights: © 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4738192]
Category: A1
Type: Journal Contribution
Validations: ecoom 2013
Appears in Collections:Research publications

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