Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Ionic Liquids
CPP 3.9: Vortrag
Montag, 31. März 2014, 12:00–12:15, ZEU 260
Surface crystallization in the ionic liquid [C22mim+][TFSI−] — •Julian Mars1, Binyang Hou1,2, Peter Reichert1,3, Diego Pontoni2, Harald Reichert2, Oleg Konovolav2, and Markus Mezger1,3 — 1Max-Planck-Institut für Polymerforschung, 55128 Mainz, Germany — 2European Synchrotron Radiation Facility, 38043 Grenoble, France — 3Johannes Guttenberg-Universität, 55128 Mainz, Germany
The near surface structure of
1-docosyl-3-methylimidazolium bis(trifluoromethane)sulfonimide
([C22mim+][TFSI−])
was studied by x-ray reflectivity (XRR) and gracing incidence diffraction (GID).
At high temperatures, an oscillating decaying electron density profile was observed by XRR experiments [1].
Up to 20∘C above the bulk melting point, the formation of
a discrete number of surface crystalline layers was detected by XRR.
Their in-plane structure was studied by GID.
Complementary bulk x-ray diffraction, differential scanning calorimetry, and
petrographic microscopy measurements suggest that the observed surface structure is related to a metastable bulk phase.
[1] M. Mezger et al., Proc. Natl. Acad. Sci. USA 110, 3733 (2013).