Representation of hydrogen atoms in molecular dynamics simulations : the influence on the computed properties of thin polystyrene films

S.A. Muntean, M.J.M. Wedershoven, R.A. Gerasimov, A.V. Lyulin

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

The united atoms (UA) and dummy hydrogen atom (DHA) approaches for molecular dynamics simulations of the interface between oxidized atactic polystyrene (aPS) thin films and water are compared. For both oxidized and non-oxidized aPS films the polymer density profile decays steepest when using the UA model. The surface roughness of the aPS film and the ordering of the phenyl rings near the surface decrease upon changing from vacuum to water for the UA, but not for the DHA model. This also supports the fact that the non-oxidized aPS films modeled in DHA representation become less hydrophobic. The water structure close to the interface also suggests that the aPS films modeled using UA are more hydrophobic compared to the aPS films modeled with DHA in the phenyl rings.
Original languageEnglish
Pages (from-to)90-97
JournalMacromolecular Theory and Simulations
Volume21
Issue number2
DOIs
Publication statusPublished - 2012

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