Dieses Dokument steht unter einer CreativeCommons Lizenz by-nc/3.0
Verlagslink DOI: 10.1039/C7NR07273B
Titel: A ferroelectric liquid crystal confined in cylindrical nanopores : reversible smectic layer buckling, enhanced light rotation and extremely fast electro-optically active Goldstone excitations
Sprache: English
Autor/Autorin: Busch, Mark 
Kityk, Andriy V. 
Piecek, Wiktor 
Hofmann, Tommy 
Wallacher, Dirk 
Calus, Sylwia 
Kula, Przemyslaw 
Steinhart, Martin 
Eich, Manfred 
Huber, Patrick 
Schlagwörter: Physics - Soft Condensed Matter;Physics - Soft Condensed Matter;Physics - Mesoscopic Systems and Quantum Hall Effect;Physics - Materials Science;Physics - Chemical Physics;Physics - Optics
Erscheinungsdatum: 27-Nov-2017
Verlag: Royal Society of Chemistry (RSC)
Quellenangabe: Nanoscale 9, (2017) 48 : pp. 19086-19099
Zeitschrift oder Schriftenreihe: Nanoscale 
Verwendet: jsp.display-strategy.tuhh.relation.issupplementedby.doi
Zusammenfassung (englisch): 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.
URI: http://tubdok.tub.tuhh.de/handle/11420/1617
DOI: 10.15480/882.1614
ISSN: 2040-3372
Institut: Optische und Elektronische Materialien E-12 
Werkstoffphysik und -technologie M-22 
Dokumenttyp: (wissenschaftlicher) Artikel
Projekt: Project “Molecular Structure and Dynamics of Liquid Crystals Based Nanocomposites” 
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