Browsing by Author "Chien L.-C."

Now showing 1 - 4 of 4
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    Electro-optical properties of carbon nanotube-doped polymer-stabilised blue phase liquid crystal IPS cell
    (Taylor and Francis Ltd., 2016) Kemiklioglu E.; Chien L.-C.
    Carbon nanotube (CNT)-doped polymer-stabilised blue phase (PSBP) liquid crystal cells driven by an in-plane field are fabricated. Their electro-optical properties are investigated for both single-wall and multiwall CNT dopants. A small amount of CNT dopants in PSBP liquid crystals leads to broadening the blue phase temperature range over 42°C and stabilising the reflection wavelength against temperature changes. A lower Kerr constant and threshold voltage are obtained for a higher CNT concentration. Higher CNT concentrations lead to an increase in the elastic constant; therefore, the rise time of CNT-doped PSBP liquid crystal cells increases and decay time decreases. © 2016 Informa UK Limited, trading as Taylor & Francis Group.
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    Effects of photoinitiator on electro-optical properties of polymerization-induced phase separation blue-phase liquid crystals
    (Springer New York LLC, 2017) Kemiklioglu E.; Chien L.-C.
    Abstract.: We have reported polymer-dispersed blue-phase (PDBP) liquid-crystal films via polymerization-induced phase separation. PDBP films are prepared by photochemical polymerization of curable crosslinking agent, monomer and blue-phase liquid crystal under an ultraviolet (UV) light. The influences of photoinitiator and weight ratio between monomer/crosslinking agent and blue phase on the electro-optical properties of PDBP liquid-crystal samples are investigated. The electro-optical (E-O) properties of PDBP films are determined in the top-down electro-optical cell. PDBP liquid-crystal films show good E-O properties with high contrast ratio and fast response time. Graphical abstract: [Figure not available: see fulltext.] © 2017, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
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    Polymer encapsulated and stabilised blue-phase liquid crystal droplets
    (Taylor and Francis Ltd., 2017) Kemiklioglu E.; Chien L.-C.
    Polymer-encapsulated–polymer-stabilised blue-phase liquid crystals (LCs) are investigated. Encapsulated droplets are formed in a polyvinyl alcohol solution by emulsification, and blue-phase (BP) LCs in the droplets are stabilised via the polymerisation of reactive monomers to extend the BP temperature range. Polymer stabilised droplets are found to cause the expansion of the BP temperature range from 53°C to below 0°C. The effects of composition on droplet formation and the electro-optical behaviour and morphological properties of these droplets are reported. © 2016 Informa UK Limited, trading as Taylor & Francis Group.
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    Effect of achiral halogen-substituted bent-core molecules on the blue phases
    (Elsevier B.V., 2018) Kemiklioglu E.; Chien L.-C.
    The effects of molecule structure and concentration of achiral bent-core molecules on the blue phase liquid crystal stabilization have been investigated. Blue phase mixtures are formed doping bent-core molecules and BP temperature range is able to widen doping bent-core molecules with different substituents. Bent-core molecules with different substituents are found to cause a decrement in the threshold and turn-on voltages of the bent-core doped blue phase liquid crystal samples, as a result of the difference in their molecular shape and dipole moments. Use of bent core LC as dopants for a blue phase LC mixture led to a reduction of the driving voltage by more than 50%. © 2018