Dr. Hans Riegler "Phase transitions and transport phenomena in planar confined systems"
Max Planck Institute of Colloids and Interfaces, Department of Interfaces, Research Campus Potsdam-Golm, 14476 Potsdam, Germany
| What |
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| When |
Nov 09, 2011 from 02:15 PM to 03:00 PM |
| Where | “Hörsaal Makromolekulare Chemie”, Stefan-Meier-Str. 31, Freiburg |
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The confinement of a system influences its phase transition behavior because of interfacial contributions to the free energy. We investigate this with molecularly thin films and nano size aggregates at solid/gas interfaces. It will be demonstrated that the interplay between phase transition, wetting properties and nucleation barriers leads to a variety of interesting (and sometimes unexpected) consequences, such as the broadening of phase transitions (1,2), size-dependent contact angles (“line tension effect” (3)), “running” droplets, whose direction and speed of movement can be controlled (4,5), nucleation barriers for melting (6), and the delayed coalescence of sessile droplets of completely miscible (!) fluids (7,8).
(1) H. Riegler and R. Köhler; Nature Physics 754 (2007)
(2) R.-C. Mutihac and H. Riegler; Langmuir 26, pp. 6394-6399 (2010)
(3) J.K. Berg, C.M. Weber, and H. Riegler; Phys. Rev. Lett. 105, 076103 (2010)
(4) P. Lazar, H. Schollmeyer, and H. Riegler; Phys. Rev. Lett. 94, 116101 (2005)
(5) P. Lazar and H. Riegler; Phys. Rev. Lett. 95, 136103 (2005)
(6) H. Kusumaatmaja, R. Lipowsky, R.-C. Mutihac, C. Jin, and H. Riegler; Nature Physics, submitted
(7) H. Riegler and P. Lazar; Langmuir 24, pp. 6395-6398 (2008)
(8) S. Karpitschka and H. Riegler; Langmuir 26, pp. 11823-11829 (2010)