Please use this identifier to cite or link to this item: doi:10.22028/D291-24722
Title: Wettability of microstructured hydrophobic sol-gel coatings
Author(s): Pilotek, Steffen
Schmidt, Helmut K.
Language: English
Year of Publication: 2003
OPUS Source: Journal of sol gel science and technology. - 26. 2003, 1/3, S. 789-792
SWD key words: Benetzung
Morphologie <Biologie>
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: The formation of appropriate surface patterns on hydrophobic surfaces leads to a general change in their wettability and the contact angle increases substantially. Such coatings are of great technical interest, especially if aqueous media are concerned as in the prevention of ice-adhesion. For this reason various fluorine containing nanocomposite coatings have been developed by sol-gel processing. The morphology of these hydrophobic surfaces has been controlled by varying the content of silica particles regarding size, degree of aggregation, and concentration. The wettability is characterized by the measurement of dynamic contact angles against water. The complete range of different wettability regimes is accessible, i.e. smooth surfaces (both low advancing contact angle and hysteresis between advancing and receding contact angle), surfaces within the Wenzel regime (high advancing contact angle and hysteresis), and superhydrophobic surfaces (high advancing contact angle and low hysteresis). The wettability is correlated with the surface roughness as determined using a profilometer or AFM. The wettability of superhydrophobic surfaces is greatly dependent on the surface tension of the liquid. By comparison of the tiltangle &theta;t of a smooth and a superhydrophobic surface, a critical surface tension &gamma;c is identified, where &theta;t (smooth surface) = &theta;t (microstructured surface). The microstructured surface provides a better run-off of liquids &gamma;lg > &gamma;c &asymp; 55 mN • m-1.
Link to this record: urn:nbn:de:bsz:291-scidok-30476
Date of registration: 19-Nov-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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