title: Surface-functionalized ionic liquid crystal-supported ionic liquid phase materials: ionic liquid crystals in mesopores.
abstract: The influence of confinement on the ionic liquid crystal (ILC) [C(18)C(1)Im][OTf] is studied using differential scanning calorimetry (DSC), polarized optical microscopy (POM), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The ILC studied is supported on Si-based powders and glasses with pore sizes ranging from 11 to 50 nm. The temperature of the solid-to-liquid-crystalline phase transition seems mostly unaffected by the confinement, whereas the temperature of the liquid-crystalline-to-liquid phase transition is depressed for smaller pore sizes. A contact layer with a thickness in the order of 2 nm is identified. The contact layer exhibits a phase transition at a temperature 30 K lower than the solid-to-liquid-crystalline phase transition observed for the neat ILC. For applications within the "supported ionic liquid phase (SILP)" concept, the experiments show that in pores of diameter 50 nm a pore filling of α>0.4 is sufficient to reproduce the phase transitions of the neat ILC.
authors: Department of Chemical and Bioengineering, Reaction Engineering, University Erlangen-Nuremberg, Egerlandstrasse 3, 91058 Erlangen, Germany.
authors: Florian T U
authors: FT
authors: Kohler
authors: Bruno
authors: B
authors: Morain
authors: Alexander
authors: A
authors: Weiss
authors: Mathias
authors: M
authors: Laurin
authors: Jörg
authors: J
authors: Libuda
authors: Valentin
authors: V
authors: Wagner
authors: Berthold U
authors: BU
authors: Melcher
authors: Xinjiao
authors: X
authors: Wang
authors: Karsten
authors: K
authors: Meyer
authors: Peter
authors: P
authors: Wasserscheid
mesh_terms: D002152:Calorimetry, Differential Scanning; D052578:Ionic Liquids / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D044367:Phase Transition; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D044366:Transition Temperature
chemical_list: D052578:Ionic Liquids; D012822:Silicon Dioxide