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Reversible phase transitions in a buckybowl monolayer
Leo Merz1, Manfred Parschau, Laura Zoppi
1Nanoscale Materials Science, Swiss Federal Laboratories for Materials Testing and Research (Empa), Uberlandstrasse 129, 8600 Dübendorf, Switzerland.
Buckybowl molecules, specifically corannulene, form denser structures when cooled on copper surfaces. Upon heating, these molecules spread out, driven by increased entropy from surface vibrations.
Area of Science:
- Surface science
- Materials science
- Physical chemistry
Background:
- Corannulene molecules, known as buckybowls, exhibit unique structural properties.
- Understanding molecular behavior on surfaces is crucial for materials design.
Purpose of the Study:
- To investigate the adsorption and phase behavior of corannulene molecules on a copper surface.
- To elucidate the thermodynamic driving forces behind the observed molecular arrangements.
Main Methods:
- Experimental observation of corannulene molecules on a copper(111) surface.
- Analysis of molecular density changes with temperature variations.
Main Results:
- Corannulene molecules self-assemble into a denser phase upon cooling on a Cu(111) surface.
- Upon heating, the molecules revert to a less dense, crystalline phase.
- The transition is linked to the excitation of molecular vibrations.
Conclusions:
- The observed phase transition is governed by entropy, specifically the vibrational modes of the buckybowl molecules.
- Surface temperature significantly influences the packing density and entropy of adsorbed corannulene.
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