Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session III (Nanotribology; Polymeric biomolecular films; Organic electronics and photovoltaics, Covalent networks on surfaces; Phase transitions; Particles and clusters; Transparent conductive oxides)
O 59.7: Poster
Wednesday, March 16, 2011, 17:30–21:00, P3
On the surface tension of ionic liquids — •Claudia Kolbeck1, Julia Lehmann3, Kevin R. J. Lovelock4, Till Cremer1, Natalia Paape2, Peter Wasserscheid2, Andreas P. Fröba3, Florian Maier1, and Hans-Peter Steinrück1 — 1LS Physikalische Chemie II, FAU Erlangen, D — 2LS Chemische Reaktionstechnik, FAU Erlangen, D — 3SAOT, FAU Erlangen, D — 4School of Chemistry, University of Nottingham, UK
The interface between ionic liquids (ILs) and gases plays a vital role in many applications such as gas separation and heterogeneous catalysis. An understanding of the surface properties of ILs is thus essential for developing new and commercially favourable systems for industrial applications. To probe the influence of the cation and anion on the surface tension of ILs nine [Tf2N]−-based and twelve [C8C1Im]+-based ILs were measured with the pendant drop method. When increasing the alkyl chain length in the [CnC1Im][Tf2N] series (n = 1, 2, 4, 6, 8, 10, 12), an initial decrease in surface tension is observed whereas for alkyl chain lengths greater than n = 8 the surface tension reaches a plateau. Functionalizing the alkyl chains with ethylene glycol groups results in a higher surface tension. For the dependence of surface tension on the chemical nature of the anion, relations are only found for subgroups of the studied ILs. Surface tension values are discussed with respect to intermolecular interactions and surface composition as determined by angle resolved X-ray photoelectron spectroscopy. - Supported by the DFG through SPP 1191 and by the Cluster of Excellence - Engineering of Advanced Materials.