Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 78: Surface Dynamics I
O 78.9: Vortrag
Donnerstag, 14. März 2013, 18:00–18:15, H42
Deposition of model chains on surfaces: anomalous relation between flux and stability — •Pritam Kumar Jana1 and Andreas Heuer2 — 1Westfälische Wilhelms-Universität Münster, Institut für Physikalische Chemie, Corrensstr. 28/30, 48149 Münster, Germany — 2Westfälische Wilhelms-Universität Münster, Institut für Physikalische Chemie, Corrensstr. 28/30, 48149 Münster, Germany
We have investigated model chains which are deposited on the surface with a fixed flux via Monte Carlo simulations. They are supposed to mimic stiff lipophilic chains with a head group and tail groups, reflecting an alkyl chain. After some subsequent fixed simulation time we determine the final energy as a function of flux and temperature. Surprisingly we observe that in some range of temperature and flux the final energy increases with decreasing flux. The physical origin of this counterintuitive observation is elucidated. In contrast, when we are performing equivalent cooling experiments no such anomaly is observed. Furthermore, it is discussed whether flux experiments produce configurations with lower energies as compared to cooling experiments. These results are related to recent experiments by the Ediger group[1] where very stable configurations of glass-forming systems have been generated via flux experiments.
Reference:
1. K. L. Kearns, S. F. Swallen, M. D. Ediger, T. Wu, Y. Sun, and L. Yu, J. Phys. Chem. B 112, 4934 (2008).