Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 62: Charged Soft Matter, Polyelectrolytes and Ionic Liquids III
CPP 62.2: Vortrag
Donnerstag, 15. März 2018, 09:45–10:00, C 243
Interfaces in fluids of ionic liquid crystals — •Hendrik Bartsch1,2, Markus Bier1,2, and Siegfried Dietrich1,2 — 1Max-Planck-Institut für Intelligente Systeme, Stuttgart, Deutschland — 2Universität Stuttgart, Stuttgart, Deutschland
Ionic liquid crystals are attracting increasing scientific, as well as technological attention, since they are expected to exhibit unique structural properties, which are directly linked to the interplay of the anisotropy of the molecules,
on the one hand, and their charges, on the other hand.
Recently, for such an ionic liquid crystal system a new type of smectic-A bulk structure could be observed, the smectic layer spacing of which is significantly larger than that of the ordinary smectic-A phase [HB et al, 2017, J. Phys.: Condens. Matter 29 464002]. Moreover, unlike the ordinary smectic-A phase it shows alternating layers of particles parallel to the layer normal and oriented perpendicular to it. This finding stresses that ionic liquid crystals exhibit distinct structural and orientational behavior. In particular in inhomogeneous systems, e.g.,
an electrolyte in the vicinity of an electrode or interfaces
between bulk phases, these properties are very important and they are expected to affect the interfacial phenomena of these materials crucially.
In this talk, we report on new findings, obtained within
classical density functional theory, concerning the fluid structure and molecular orientations at a free interface of coexisting bulk phases. We discuss and compare the density and orientational order parameter profiles for different kinds of the liquid-smectic phase coexistence occurring in ionic liquid crystals and ordinary (uncharged) liquid crystals.