Hysteresis-free polymer-stabilized blue phase liquid crystals using thermal recycles

Chen, Hung Shan; Lin, Yi-Hsin; Wu, Chun Hung; Chen, Michael; Hsu, Hsu Kuan

doi:10.1364/ome.2.001149

Cited by 47 publications

(42 citation statements)

References 19 publications

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“…However, hysteresis and uniformity hinder the development of PS-BPLC-based devices. Recently, we reduced hysteresis of PS-BPLC by means of competition between a homogeneous nucleation and a heterogeneous nucleation during crystal growth of PSBP-LCs under external fields, such as a thermal field or an electric field [16,17]. We found that heterogeneous nucleation, which means the PS-BPLCs grow at the interface between two different materials or phases, has capability of suppressing homogeneous nucleation in terms of grain growth and inhibition by turns.…”

Section: Introductionmentioning

confidence: 99%

Influence of alignment layers on crystal growth of polymer-stabilized blue phase liquid crystals

Chen

et al. 2016

Opt. Mater. Express

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The feature that devices based on blue phase liquid crystals (BPLCs) is free of alignment layers. However, the alignment layers could affect the morphologies of BPLC-devices as well as the electro-optical properties. In this paper, we investigate the influence of alignment layers to crystal growth of polymer-stabilized blue phase liquid crystals (PS-BPLCs). Without alignment layer, PS-BPLCs experiences both homogeneous nucleation and heterogeneous nucleation, and the morphology appears in random crystal orientations. On the contrary, when the surfaces coated with alignment layers, a heterogeneous nucleation dominates during the crystal growth process. We further proposed a possible mechanism for crystal growth under different surface condition. This study provides an alternative method to control crystal growth of PS-BPLCs, which is for facilitating many PS-BPLCs based photonic devices. of the electro-optic Kerr effect in polymer-stabilized blue phases," Phys. Rev. E Stat. Nonlin. Soft Matter Phys. 91(2), 022503 (2015). 24.

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Section: Introductionmentioning

confidence: 99%

Influence of alignment layers on crystal growth of polymer-stabilized blue phase liquid crystals

Chen

et al. 2016

Opt. Mater. Express

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“…The mixtures were then cooled to the temperature at which BP appeared at a cooling rate of 0.1 C , in line with the standard practice from literature [12], [19]- [21]. A TS-4 thermal microscope stage (from Physitemp, USA) was used to control the temperature precisely.…”

Section: Methodsmentioning

confidence: 99%

Long Term Stability of Polymer Stabilized Blue Phase Liquid Crystals

Joshi

Smet

Shang

et al. 2015

J. Display Technol.

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The issue of long term stability of polymer stabilized blue phase liquid crystals was investigated. It was found that for certain liquid crystals and commonly used chiral dopant combinations, polymer stabilized blue phase liquid crystals develop dendrite like structures. These features are highly scattering and are detrimental to the uniformity of texture. Various possible causes were looked into and it was identified that crystallization of the chiral dopant leads to dendrites and a possible remedy is proposed.Index Terms-Chiral dopants, dendrites, long term stability, polymer stabilized blue phase liquid crystals (BPLCs).

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“…Chiral liquid crystalline polymers (LCPs) may exhibit a marvellous variety of liquid crystalline phases, including the chiral smectic phase (SC * ), the cholesteric (Ch) phase and the blue phases [7][8][9][10][11][12][13]. The blue phases have become an important and complex topic in LCP research because of their unique optical properties [14][15][16][17][18]. Recently, much effort has been devoted to explore stabilising blue phase liquid crystals with wide temperature range, both experimentally and theoretically [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Optical and mesomorphic properties characterisation of chiral liquid crystalline copolysiloxane exhibiting cholesteric and blue phases

Wang

Zhang

2013

Liquid Crystals

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A series of liquid crystalline polymers (LCPs) have been synthesised by two cholesteric monomers M 1 , M 2 and a nematic monomer M 3 . The chemical structures and liquid crystalline properties of the monomers and polymers have been characterised by FTIR, 1 H-NMR, differential scanning calorimetry, thermogravimetric analyses, X-ray diffraction measurements and polarising optical microscopy. All LCPs show a high thermal stability with wide mesophase temperature ranges. For polymer P 1 bearing only cholesteric LC monomers component, it shows a cholesteric phase, whereas others display a blue phase besides a cholesteric phase. The formation of the blue phase is based on the structures of the polymers and the produced biaxial helix. The glass transition temperature and isotropic temperature of the polymers decrease on heating cycle with increasing the content of M 3 in the polymers. The specific rotation values of the polymers are temperature-sensitive. The reflection spectra of polymers P 1 -P 6 show that the maximum reflected wavelengths shift to long wavelength with increasing the content of M 3 in the polymer systems. The frequency and intensity of the bands change sharply at the temperature where cholesteric phase changes to blue phase, but they show a weak dependence on temperature in the blue phase.

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Hysteresis-free polymer-stabilized blue phase liquid crystals using thermal recycles

Cited by 47 publications

References 19 publications

Influence of alignment layers on crystal growth of polymer-stabilized blue phase liquid crystals

Influence of alignment layers on crystal growth of polymer-stabilized blue phase liquid crystals

Long Term Stability of Polymer Stabilized Blue Phase Liquid Crystals

Optical and mesomorphic properties characterisation of chiral liquid crystalline copolysiloxane exhibiting cholesteric and blue phases

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