Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 47: Complex Fluids and Soft Matter I (joint session DY/CPP)
DY 47.5: Vortrag
Donnerstag, 23. März 2017, 16:00–16:15, ZEU 160
Quantised Phase Transition of Confined Discotics forming Concentric Rings: Monte-Carlo and Experimental Studies — •Arne W. Zantop1, Kathrin Sentker2, Patrick Huber2, and Marco G. Mazza1 — 1Max-Planck-Institut für Dynamik Komplexer Fluide, Am Faßberg 17, 37077 Göttingen — 2Institut für Materialphysik und -technologie, Technische Universität Hamburg-Harburg, Eißendorferstr. 42, 21073 Hamburg
Interfaces and geometrical confinement crucially alter the phase transitions of various substances, as those of liquid crystals. We present combined results of a parallel tempering Monte-Carlo study of the discotic Gay-Berne-II fluid model in cylindrical nano-confinement, and an experimental study of the triphenylene derivate HAT6 confined in porous silica pores rendered both hydrophilic and hydrophobic. Here we report a quantised, layer by layer transition of the confined discotic liquid crystals. While the bulk phase shows a discontinuous transition from isotropic to hexagonal columnar phase upon cooling, the confined system forms concentric rings. Starting form the interface these ring develop inwards one after another with a discontinuous increase in local order parameter followed by plateaus with a continuous increase in local order.