Adhäsion von Vesikeln an lateral strukturierten Grenzflächen

• Antragsteller: Professor Dr. Reinhard Lipowsky
• Fachliche Zuordnung: Physik der kondensierten Materie
• Förderung: Förderung von 1998 bis 2005
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 5106580

The wetting morphology of structured or imprinted surfaces depends on the pattern of the underlying surface domains. These morphologies may undergo abrupt changes as a control parameter such as, e.g., the volume of the wetting liquid is varied. The existence of these transitions is intimately related to the fact that the contact angle on a surface domain is, in general, not unique but may attain a whole range of different values.In the project proposed here, we want to study two problems related to these morphological wetting transitions. First, we want to consider the wetting morphology of two striped domains which are covered by two liquid channels. Each liquid channel can develope a bulge which may fuse with the neighboring channel and, thus, form a bridge between the two channels. Such bridge states have already been observed experimentally. One important question is the stability of these bridges and possible transitions to different channel states which cover both the neighboring stripes and the intermediate lyophobic surface region.A second, more general problem is concerned with the influence of the contact line tension on the wetting morphology. We will first study these line tension effects for single surface domains with sharp corners or kinks. The liquid will try to dewet the surface regions adjacent to these corners in order to reduce the energy of the contact line. Therefore, one now has morphological wetting transitions as a function of the domain size.

• DFG-Verfahren: Schwerpunktprogramme
• Teilprojekt zu: SPP 1052: Benetzung und Strukturbildung an Grenzflächen
• Beteiligte Person: Privatdozentin Dr. Rumiana Dimova