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Rheological characterization of ionic liquids and ionic liquid crystals with promising tribological performance

: Amann, T.; Dold, C.; Kailer, A.

Preprint urn:nbn:de:0011-n-2170738 (5.8 MByte PDF)
MD5 Fingerprint: aaa359605b9b24b2e4f4a0062f610b7e
Erstellt am: 13.11.2013

Soft matter 8 (2012), Nr.38, S.9840-9846
ISSN: 1744-683X
ISSN: 1744-6848
Deutsche Forschungsgemeinschaft DFG
SPP 1191; KA2745/3-1
Triborheology and molecular structure of novel ionic liquids influenced by flow and electric fields (IL-Triborheology)
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()
ionic liquids; ionic liquid crystals; friction; rheology; phase transition temperature; viscoelastic properties; molecular orientation

Several rheological studies of ionic liquids and ionic liquid crystals were performed to describe the measured low coefficients of friction (mu approximate to 0.02) in reciprocating sliding tests (cylinder-on-disc and ring-on-disc). The main mechanisms which are assumed to lead to low friction values are the chemical composition of the anion and the orientation of the molecules under shear. The ionic liquid crystals show strong non-Newtonian viscosity behavior and viscoelastic properties in the liquid crystalline phase. In addition, the viscosity depends on the molecule orientation, which can be influenced by shear. At the transition from the liquid crystalline to the isotropic phase a strong decrease of viscosity is observed.