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Publisher DOI: 10.1039/C7NR07273B
arXiv ID: 1711.09673v1
Title: A ferroelectric liquid crystal confined in cylindrical nanopores : reversible smectic layer buckling, enhanced light rotation and extremely fast electro-optically active Goldstone excitations
Language: English
Authors: Busch, Mark  
Kityk, Andriy V. 
Piecek, Wiktor 
Hofmann, Tommy 
Wallacher, Dirk 
Calus, Sylwia 
Kula, Przemyslaw 
Steinhart, Martin 
Eich, Manfred 
Huber, Patrick 
Keywords: Physics - Soft Condensed Matter;Physics - Soft Condensed Matter;Physics - Mesoscopic Systems and Quantum Hall Effect;Physics - Materials Science;Physics - Chemical Physics;Physics - Optics
Issue Date: 27-Nov-2017
Publisher: Royal Society of Chemistry (RSC)
Source: Nanoscale 9, (2017) 48 : pp. 19086-19099
Journal or Series Name: Nanoscale 
Is supplemented by: 10.5281/zenodo.1243648
Abstract (english): The orientational and translational order of a thermotropic ferroelectric liquid crystal (2MBOCBC) imbibed in self-organized, parallel, cylindrical pores with radii of 10, 15, or 20 nm in anodic aluminium oxide monoliths (AAO) are explored by high-resolution linear and circular optical birefringence as well as neutron diffraction texture analysis. The results are compared to experiments on the bulk system. The native oxidic pore walls do not provide a stable smectogen wall anchoring. By contrast, a polymeric wall grafting enforcing planar molecular anchoring results in a thermal-history independent formation of smectic C* helices and a reversible chevron-like layer buckling. An enhancement of the optical rotatory power by up to one order of magnitude of the confined compared to the bulk liquid crystal is traced to the pretransitional formation of helical structures at the smectic-A*-to-smectic-C* transformation. A linear electro-optical birefringence effect evidences collective fluctuations in the molecular tilt vector direction along the confined helical superstructures, i.e. the Goldstone phason excitations typical of the para-to-ferroelectric transition. Their relaxation frequencies increase with the square of the inverse pore radii as characteristic of plane-wave excitations and are two orders of magnitude larger than in the bulk, evidencing an exceptionally fast electro-optical functionality of the liquid-crystalline-AAO nanohybrids.
DOI: 10.15480/882.1614
ISSN: 2040-3372
Institute: Optische und Elektronische Materialien E-12 
Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
Project: SFB 986: Teilprojekt B7 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen 
SFB 986: Teilprojekt C2 - Keramikbasierte hochtemperaturstabile Wärmestrahlungsreflektoren und Strukturfarben 
License: CC BY-NC 3.0 (Attribution-NonCommercial) CC BY-NC 3.0 (Attribution-NonCommercial)
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