Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Competitive Electrowetting of Polymer Surfaces by Water and Decane
Ist Teil von
Langmuir, 2000-04, Vol.16 (7), p.3349-3354
Ort / Verlag
American Chemical Society
Erscheinungsjahr
2000
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The present study deals with electrocapillarity effects in the three-phase system water−decane−polymer. This system consists of a decane droplet which adheres under water on a polymer surface. We applied an electric potential between an electrode beneath the polymer film and a platinum electrode immersed in the water. The polymer film acts as insulator: no steady electrical current flows between the electrodes. When the voltage is increased, the contact angle of decane and water changes, in some cases by up to 100°. The shape of the electrowetting curve (contact-angle cosine versus voltage plot) strongly depends on the type of the polymer. A saturation at higher voltages, connected with a hysteresis, is interpreted in terms of charge carrier injection into the polymer surface. Other deviations of the experimental results from the Lippmann−Young parabola concern a broadening with the polyolefins, a strong shift, and apparent reduction to one branch with two fluoropolymers, and for PET and a heavily oxidized PE sample the deviations concern a nearly zero dependence of the voltage.
Sprache
Englisch
Identifikatoren
ISSN: 0743-7463
eISSN: 1520-5827
DOI: 10.1021/la990518k
Titel-ID: cdi_crossref_primary_10_1021_la990518k
Format
–
Weiterführende Literatur
Empfehlungen zum selben Thema automatisch vorgeschlagen von bX