Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Colloids and Complex Liquids II

CPP 36.9: Vortrag

Mittwoch, 2. April 2014, 17:15–17:30, ZEU 114

Stress-driven Dynamic Behavior of Free-Standing Bent-Core Liquid Crystal Filaments — •Tanya Ostapenko¹, Seyyed Muhammad Salili², Alexey Eremin¹, Antal Jákli², and Ralf Stannarius¹ — ¹Institute of Experimental Physics, Otto-von-Guericke-Universität, 39106 Magdeburg, Germany — ²Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA

Filament forming materials, such spider silk, collagen and cellulose, are widespread in nature [1]. The B₇ liquid crystalline phase of bent-core mesogens is an exceptionally good example of a mesophase forming very stable fluid filaments [2]. This phase is distinguished by an internal structure of strongly undulated molecular layers and spontaneous polarization with local splay. This results in an overall chiral columnar structure.

Here, we report on the dynamic behavior of free-standing bent-core liquid crystal filaments under dilative and axial compressive stresses in the B₇ phase [3]. We found that such filaments demonstrate very complex structures depending on the filament’s temperature relative to the clearing point, initial filament thickness, and on the velocity at which the filament is pulled or compressed. We discuss possible reasons for the formation of such structures.

[1] F. Vollrath, D. Knight. Nature 410, 541 (2001).

[2] A. Jákli, D. Krüerke, and G.G. Nair, Phys. Rev. E 67 (2003).

[3] T. Ostapenko, S.M. Salili, A. Eremin, A. Jákli, and R. Stannarius (submitted).