Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)

O 28.13: Poster

Mittwoch, 10. März 2004, 16:00–19:00, Bereich C

Mechanisms and capability of Steam Laser Cleaning — •F. Lang1, M. Mosbacher1, S. Georgiou2, and P. Leiderer11University of Konstanz, Fach M676, 78457 Konstanz, Germany — 2FORTH - IESL, P.O. Box 1527, 71110 Heraklion, Greece

Steam Laser Cleaning is a powerful approach to remove submicron particles from surfaces. In the first step a liquid is applied onto the contaminated surface. Afterwards a laser pulse heats part of the fluid to a superheated state resulting in bubble nucleation and growth. Thereby strong forces are exerted on the contaminants, which are able to overcome the adhesion of the particles to the surface.

Our measurements covering a broad range of particle sizes demonstrated the existence of a universal cleaning threshold for the laser fluence. In addition the influence of different liquid layer thicknesses was explored. Investigations of the surfaces after cleaning verified for the first time that damage free removal can be achieved, if the experimental parameters are chosen properly. Moreover fundamental studies of the bubble nucleation and growth in the superheated liquid were conducted to gain a more detailed understanding of the phase transition dynamics.

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