title: Effective van der Waals surface energy of self-assembled monolayer films having systematically varying degrees of molecular fluorination.
abstract: The systematic variation of the van der Waals surface energy with fluorination for a series of self-assembled monolayers (SAMs) generated by the adsorption of partially fluorinated alkanethiols onto the surface of gold is examined experimentally and theoretically. The surface energy is elucidated on the basis of an effective Hamaker constant, which is obtained as a combination of the respective Hamaker constants of fluorocarbons and hydrocarbons; the fraction depends on the degree of fluorination. The good agreement between experiment and theory is discussed. In addition, the Hamaker constants of various liquids contacted on the well-defined hydrophobic surfaces are interpreted using modified Lifshitz theory.
authors.affiliation: Department of Materials Science and Engineering, Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi 756-0884, Japan. taken@ed.yama.tus.ac.jp
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Takenaga
authors.forename: Sadaharu
authors.initials: S
authors.lastname: Jo
authors.forename: Michael
authors.initials: M
authors.lastname: Graupe
authors.forename: T Randall
authors.initials: TR
authors.lastname: Lee
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004563:Electrochemistry; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry; D008956:Models, Chemical; D013499:Surface Properties; D053835:Unilamellar Liposomes / Q000737:chemistry*
chemical_list: D006845:Hydrocarbons, Fluorinated; D053835:Unilamellar Liposomes