Münster 1999 – wissenschaftliches Programm

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O: Oberflächenphysik

O 32: Adsorption an Oberfl
ächen (VI)

O 32.7: Vortrag

Donnerstag, 25. März 1999, 17:45–18:00, S10

Critical wetting of a liquid/vapor-interface by octane — •Hans Riegler and Thomas Pfohl — Max-Planck-Institut fuer Kolloid- und Grenzflaechenforschung, Rudower Chaussee 5, D-12489 Berlin/Adlershof

The wetting of the planar interface between air saturated with octane vapor and an aqueous solution by octane is investigated by ellipsometry and interfacial tension measurements. The interfacial interactions are varied through the concentration of the uncharged solute (glucose). We observe abrupt and continuous increases of the octane coverage with growing solute concentration. This we attribute to short and long range (dispersion) interactions, respectively. The continuous thickness growth is analyzed as a critical wetting transition.

/1/ Thomas Pfohl, Helmuth Mohwald, and Hans Riegler, Langmuir 14(18), 5285 (1998)

/2/ Thomas Pfohl and Hans Riegler, Phys. Rev. Lett., in press