Preliminary communication: Monte carlo simulations of mixed monolayers

J. Ilja Siepmann, Ian R. McDonald

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Abstract

Results are presented of Monte Carlo calculations for self-assembled monolayer systems consisting of binary mixtures of long-chain alkyl thiols of different lengths adsorbed on a gold surface. A sampling scheme is used in which large- scale conformational changes are made to a trial molecule in a single move, supplemented by attempted interconversions of long and short chains. A marked trend towards segregation of the two species is observed, and the outer regions of the monolayers are found to be conformationally more disordered than the inner parts; both effects are most pronounced when the concentration of long chains is low.

Original languageEnglish (US)
Pages (from-to)255-259
Number of pages5
JournalMolecular Physics
Volume75
Issue number2
DOIs
StatePublished - Feb 10 1992
Externally publishedYes

Bibliographical note

Funding Information:
We thank C. D. Bain and M. L. Klein for many stimulating discussions. The work has been supported by SERC under Special Grant No. GR/E68716. One of us (JIS) acknowledges support by a Stipendium der Friedrich-Naumann-Stiftung and by a Foreign arid Commonwealth Office Scholarship.

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