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Type: Journal article
Title: Molecular shape and the energetics of chemisorption: From simple to complex energy landscapes
Author: Huang, D.
Harrowell, P.
Citation: Physical Review E. (Statistical, Nonlinear, and Soft Matter Physics), 2012; 86(1):1-8
Publisher: American Physical Soc
Issue Date: 2012
ISSN: 1539-3755
Statement of
David M. Huang and Peter Harrowell
Abstract: We enumerate all local minima of the energy landscape for model rigid adsorbates characterized by three or four equivalent binding sites (e.g., thiol groups) on a close-packed (111) surface of a face-centered-cubic crystal. We show that the number of energy minima increases linearly with molecular size with a rate of increase that depends on the degree of registry between the molecule shape and the surface structure. The sparseness of energy minima and the large variations in the center-of-mass positions of these minima vs molecular size for molecules that are incommensurate with the surface suggests a strong coupling in these molecules between surface mobility and shape or size fluctuations resulting from molecular vibrations. We also find that the variation in the binding energy with respect to molecular size decreases more rapidly with molecular size for molecules with a higher degree of registry with the surface. This indicates that surface adsorption should be better able to distinguish molecules by size if the molecules are incommensurate with the surface.
Keywords: Rheology; Energy Transfer; Adsorption; Particle Size; Phase Transition; Models, Chemical; Models, Molecular
Rights: ©2012 American Physical Society
RMID: 0020121260
DOI: 10.1103/PhysRevE.86.011606
Appears in Collections:Chemistry publications

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