Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Charged Soft Matter I
CPP 44.10: Vortrag
Donnerstag, 3. April 2014, 12:00–12:15, ZEU 118
Observation of Polarization in the Leaning Plane of a Bent-Core Molecular Compound — •Nattaporn Chattham1,2, Maria Gabriela Tamba1, Eduard Westphal4, Hideo Takezoe1,3, Ralf Stannarius1, Carsten Tschierske4, and Alexey Eremin1 — 1Otto-von-Guericke-Universität Magdeburg, IEP/ANP, D-39106 Magdeburg, Germany — 2Department of Physics, Faculty of Science, Kasetsart University, Bangkok 10900 Thailand — 3Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Tokyo 152-8552, Japan — 4Institute of Chemistry, Martin-Luther-University Halle-Wittenberg, D-06120 Halle,Germany
Bent-core molecules have been of interest to liquid crystal scientists for over decades. Designing molecules and identifying their phase structures provide much knowledge to understand the complexity of molecular organization of these phase structures. In the conventional polar SmCP (B2) phase of bent-core mesogens, the tilting of molecules with respect to the layer normal occurs by the rotation about the bend direction, so that the spontaneous polarization is perpendicular to the tilt plane. In contrast, molecules lean within their bend plane in the SmC leaning phase, where the polarization is in the leaning plane and deviates from the layer plane. Here we report a clear evidence of this structure, i.e., the polarization lying in the leaning plane from direct observations of thick freely suspended films at inclined incidence under an in-plane electric field. The induced polarization was also confirmed by second-harmonic generation (SHG) activity. This work was supported by Alexander von Humboldt Foundation.