Amphiphilic
molecules with a terminal diole-head form thermotropic-smectic
and lyotropic-lamellar layer-structures with cooperative
hydrogen bonds, which allow a fast proton
conductivity (Grotthuß-mechanism)
along the smectic layers. The electrolytical charge
transport and the possible excess conductivity in
these systems is investigated in both free-standing
liquid crystal films (thickness approx. 100 nm) and
cells with blocking electrodes by means of impedance
spectroscopy.
A possible application is for instance the use as
membrane materials in mid-temperature fuel cells.
Publications
Elektrolytischer
Ladungstransport in smektischen und lamellaren Flüssigkristallphasen
amphiphiler Moleküle Dissertation, Roland Germer 2001, ISBN 3-89720-609-9
Anomalous electric conductivity in amphiphilic smectic liquid crystals
with terminal diol-groups
R. Germer, F. Giesselmann*, P. Zugenmaier, and C. Tschierske Molecular Crystals and Liquid Crystals331,
643 - 650 (1999)
Elektrische Leitfähigkeit in amphiphilen Flüssigkristallen Diplomarbeit, Arne Langhoff 1997
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