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dc.contributor.authorYu, Chia-Huaen_US
dc.contributor.authorWu, Po-Changen_US
dc.contributor.authorLee, Weien_US
dc.date.accessioned2019-06-03T01:08:36Z-
dc.date.available2019-06-03T01:08:36Z-
dc.date.issued2019-04-01en_US
dc.identifier.issn2073-4352en_US
dc.identifier.urihttp://dx.doi.org/10.3390/cryst9040183en_US
dc.identifier.urihttp://hdl.handle.net/11536/151964-
dc.description.abstractWe demonstrated previously that the temperature of a sandwich-type liquid crystal cell with unignorable electrode resistivity could be electrically increased as a result of dielectric heating. In this study, we take advantage of such an electro-thermal effect and report on a unique electric-field approach to the formation of uniform lying helix (ULH) texture in a cholesteric liquid crystal (CLC) cell. The technique entails a hybrid voltage pulse at frequencies f(1) and, subsequently, f(2), which are higher and lower than the onset frequency for the induction of dielectric heating, respectively. When the cell is electrically sustained in the isotropic phase by the voltage pulse of V = 35 V-rms at f(1) = 55 kHz or in the homeotropic state with the enhanced ionic effect at V = 30 V-rms and f(1) = 55 kHz, our results indicate that switching of the voltage frequency from f(1) to f(2) enables the succeeding formation of well-aligned ULH during either the isotropic-to-CLC phase transition at f(2) = 1 kHz or by the electrohydrodynamic effect at f(2) = 30 Hz. For practical use, the aligning technique proposed for the first time in this study is more applicable than existing alternatives in that the obtained ULH is adoptable to CLCs with positive dielectric anisotropy in a simple cell geometry where complicated surface pretreatment is not required. Moreover, it is electrically switchable to other CLC textures such as Grandjean planar and focal conic states without the need of a temperature controller for the phase transition, the use of ion-rich LC materials, or mechanical shearing for textural transition.en_US
dc.language.isoen_USen_US
dc.subjectdielectric heatingen_US
dc.subjectcholesteric liquid crystalsen_US
dc.subjectuniform lying helixen_US
dc.titleElectro-Thermal Formation of Uniform Lying Helix Alignment in a Cholesteric Liquid Crystal Cellen_US
dc.typeArticleen_US
dc.identifier.doi10.3390/cryst9040183en_US
dc.identifier.journalCRYSTALSen_US
dc.citation.volume9en_US
dc.citation.issue4en_US
dc.citation.spage0en_US
dc.citation.epage0en_US
dc.contributor.department影像與生醫光電研究所zh_TW
dc.contributor.departmentInstitute of Imaging and Biomedical Photonicsen_US
dc.identifier.wosnumberWOS:000467300100003en_US
dc.citation.woscount0en_US
Appears in Collections:Articles