Deposition and Wettability of [bmim][triflate] on Self-Assembled Monolayers
| Autor: | G. Kane Jennings, Clare McCabe, Oleg A. Mazyar, Angeline M. Cione, Brandon D. Booth |
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| Rok vydání: | 2009 |
| Předmět: |
Inorganic chemistry
Self-assembled monolayer Hexadecane Surfaces Coatings and Films Electronic Optical and Magnetic Materials Surface tension Contact angle chemistry.chemical_compound General Energy chemistry Monolayer Ionic liquid Physical chemistry Wetting Physical and Theoretical Chemistry Trifluoromethanesulfonate |
| Zdroj: | The Journal of Physical Chemistry C. 113:2384-2392 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp808098w |
| Popis: | The interfacial behavior of ionic liquids (ILs) affects their use in many applications including as solvents, electrolytes, and lubricants. Here, we report the wettability and deposition of 1-n-butyl-3-methylimidazolium triflate ([bmim][triflate]) on model surfaces generated by the assembly of thiol- and silane-based monolayers on gold and silicon, respectively. Advancing contact angles of [bmim][triflate] on —CF3, —CH3, ═CH2, —OH, and mixed —CH3/—OH surfaces are found to be intermediate between those of water and hexadecane on the same surfaces and dissimilar to those of dicyclohexyl, which has a similar surface tension as [bmim][triflate] but only dispersive intermolecular interactions. Molecular simulations provide qualitative agreement with experimental contact angles and show that the hydroxyl surface disrupts electrostatic interactions between the ions of the [bmim][triflate] droplet, resulting in lower local surface tensions and increased area of contact. IL films as thin as ∼100 nm were prepared b... |
| Databáze: | OpenAIRE |
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