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Reversible Phase Transitions in a Buckybowl Monolayer
Author(s) -
Merz Leo,
Parschau Manfred,
Zoppi Laura,
Baldridge Kim K.,
Siegel Jay S.,
Ernst KarlHeinz
Publication year - 2009
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200804563
Subject(s) - monolayer , molecule , corannulene , excitation , adsorption , phase transition , crystallography , chemical physics , materials science , crystal (programming language) , copper , chemistry , nanotechnology , condensed matter physics , physics , computer science , programming language , organic chemistry , quantum mechanics , metallurgy
Like penguins on ice , buckybowl molecules move closer together when cooled on a copper surface (see model of a corannulene molecule adsorbed on Cu(111)). Upon heating, the molecules spread out into the original crystal phase again. The lower density at room temperature can be explained by the increase in entropy owing to the excitation of bowl vibrations at the surface.