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Optical Gas Sensing with Encapsulated Chiral-Nematic Liquid Crystals

  • Optical gas sensors based on chiral-nematic liquid crystals (N* LCs) forming one-dimensional photonic crystals do not require electrical energy and have a considerable potential to supplement established types of sensors. A chiral-nematic phase with tunable selective reflection is induced in a nematic host LC by adding reactive chiral dopants. The selective chemical reaction between dopant and analyte is capable to vary the pitch length (the lattice constant) of the soft, self-assembled, one-dimensional photonic crystal. The progress of the ongoing chemical reaction can be observed even by naked eye because the color of the samples varies. In this work, we encapsulate the responsive N* LC in microscale polyvinylpyrrolidone (PVP) fibers via coaxial electrospinning. The sensor is, thus, given a solid form and has an improved stability against nonavoidable environmental influences. The reaction behavior of encapsulated and nonencapsulated N* LC toward a gaseous analyte is compared, systematically. Making use of the encapsulation is an important step to improve the applicability.

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Document Type:Article
Author:Lukas Pschyklenk, Thorsten Wagner, Alexander Lorenz, Peter Kaul
Parent Title (English):ACS Applied Polymer Materials
First Page:1925
Last Page:1932
Publisher:American Chemical Society (ACS)
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2020/04/21
Copyright:© 2020 American Chemical Society. This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
Funding:This work is part of the BMBF-Project OptoSpin (FKZ 13FH023IX6). The authors acknowledge the financial support by the Federal Ministry of Education and Research of Germany.
Keyword:chiral-nematic; coaxial electrospinning; encapsulation; liquid crystal; low molecular weight; tunable pitch
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Sicherheitsforschung (ISF)
Projects:OptoSpin - IngenieurNachwuchs 2016: Optische Gassensorik mit dotierten Flüssigkristallen verbunden mit koaxialem Elektrospinnen (DE/BMBF/13FH023IX6)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik / 660 Chemische Verfahrenstechnik
Entry in this database:2020/04/29
Licence (English):License LogoACS AuthorChoice/Editors’ Choice License