Partial Air Wetting on Solvophobic Surfaces in Polar Liquids

The properties of solvophobic surfaces in polar liquids are studied by sedimentation experiments as well as by force measurements using a scanning force microscope (SFM). Depending on whether the polar liquid contacts the solvophobic surface under normal air pressure or under vacuum the experimental...

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Bibliographic Details
Published in:Journal of colloid and interface science 1999-03, Vol.211 (2), p.243-251
Main Authors: Boehnke, U.-C., Remmler, T., Motschmann, H., Wurlitzer, S., Hauwede, J., Fischer, Th.M.
Format: Article
Language:English
Subjects:
air bubbles
butanol
Chemistry
diethyltetramethyldisilazane
Exact sciences and technology
Gas-liquid interface and liquid-liquid interface
General and physical chemistry
long-range hydrophobic force
partial wetting
PDMS
propanediol
propanetriol
scanning force microscopy
sedimentation experiments
Surface physical chemistry
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Summary:The properties of solvophobic surfaces in polar liquids are studied by sedimentation experiments as well as by force measurements using a scanning force microscope (SFM). Depending on whether the polar liquid contacts the solvophobic surface under normal air pressure or under vacuum the experimental results are different. Sedimentation velocities of vacuum-contacted solvophobic surfaces are similar to those of solvophilic vacuum- or air-contacted ones. However, for the air-contacted solvophobic surfaces there is a slip boundary condition of the hydrodynamic flow causing a change of the sedimentation velocity of about 20%, and a long-range attraction varying with the polarity of the liquid molecule is observed between them. These effects can be explained by an incomplete air dewetting of the solvophobic surface when brought into contact with the polar liquid at normal air pressure.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1998.5987