Light-induced pitch transitions in photosensitive cholesteric liquid crystals: Effects of anchoring energy

dc.citation.epage012503-10en_US
dc.citation.issueNumber1en_US
dc.citation.spage012503-1en_US
dc.citation.volumeNumber89en_US
dc.contributor.authorOrlova, T. N.en_US
dc.contributor.authorIegorov, R. I.en_US
dc.contributor.authorKiselev, A. D.en_US
dc.date.accessioned2016-02-08T10:58:58Z
dc.date.available2016-02-08T10:58:58Z
dc.date.issued2014en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe experimentally study how the cholesteric pitch P depends on the equilibrium pitch P0 in planar liquid crystal (LC) cells with both strong and semistrong anchoring conditions. The cholesteric phase was induced by dissolution in the nematic LC of the right-handed chiral dopant 7-dehydrocholesterol (7-DHC, provitamin D3) which transforms to left-handed tachysterol under the action of uv irradiation at the wavelength of 254 nm. By using the model of photoreaction kinetics we obtain the dependencies of isomer concentrations and, therefore, of the equilibrium pitch on the uv irradiation dose. The cholesteric pitch was measured as a function of irradiation time using the polarimetry method. In this method, the pitch is estimated from the experimental data on the irradiation time dependence of the ellipticity of light transmitted through the LC cells. It is found that the resulting dependence of the twist parameter 2D/P (D is the cell thickness) on the free twisting number parameter 2D/P0 shows jumplike behavior and agrees well with the known theoretical results for the anchoring potential of Rapini-Papoular form. © 2014 American Physical Society.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:58:58Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2014en
dc.identifier.doi10.1103/PhysRevE.89.012503en_US
dc.identifier.issn1539-3755
dc.identifier.urihttp://hdl.handle.net/11693/26375
dc.language.isoEnglishen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionofhttps://doi.org/10.1103/PhysRevE.89.012503en_US
dc.source.titlePhysical Review E - Statistical, Nonlinear, and Soft Matter Physicsen_US
dc.subjectAnchoring energiesen_US
dc.subjectCell thicknessen_US
dc.subjectCholesteric phaseen_US
dc.subjectCholesteric pitchen_US
dc.subjectIrradiation timeen_US
dc.subjectLiquid crystal cellsen_US
dc.subjectPhotoreaction kineticsen_US
dc.subjectUV irradiationen_US
dc.subjectComputer Simulationen_US
dc.subjectEnergy Transferen_US
dc.subjectLighten_US
dc.subjectLiquid Crystalsen_US
dc.subjectMaterials Testingen_US
dc.subjectModels, Chemicalen_US
dc.subjectModels, Molecularen_US
dc.subjectRadiation Dosageen_US
dc.subjectRefractometryen_US
dc.titleLight-induced pitch transitions in photosensitive cholesteric liquid crystals: Effects of anchoring energyen_US
dc.typeArticleen_US

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