Polymer encapsulated and stabilised blue-phase liquid crystal droplets

Kemiklioğlu, Emine; Chien, Liang–Chy

doi:10.1080/02678292.2016.1234072

Cited by 14 publications

(7 citation statements)

References 23 publications

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“…6,7 Devices have in fact been developed using encapsulated LC droplets, where the encapsulating shell is capable of changing the alignment in LC surface anchoring, e.g., responding to reactions with different substances. [8][9][10] The cumulative effect due to system changes, such as the imposition of external electric fields or changes in temperature, is generally tractable using computational approaches. On the other hand, a reliable model able to describe the localized effect due to an external substance is currently missing, in part because LC confinement occurs at lengths scales that are smaller than those probed by continuum models, and larger than those typically probed by molecular and coarse-grained simulations.…”

Section: Introductionmentioning

confidence: 99%

Engineered liquid crystal nano droplets: insights from multi-scale simulations

2020

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Section: Introductionmentioning

confidence: 99%

Engineered liquid crystal nano droplets: insights from multi-scale simulations

2020

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“…The electro-optic properties of PDLC devices, such as displays and smart windows can be improved by using BPLCs. The polymer dispersed or encapsulated blue phase liquid crystal films have many advantages when compared to that of polymer dispersed or encapsulated nematic liquid crystals [33][34][35]53]. One of these advantages of BPLCs is field-induced birefringence due to their submillisecond response time, which is at least one order of magnitude faster than the present nematic LC-based displays [53].…”

Section: Polymer Dispersion Of Blue Phasesmentioning

confidence: 99%

“…This chapter will be focused on the stabilization and electro-optical properties of blue phases and their potentials for advanced applications in display as well as photonic devices [18-22, 31, 32]. The chapter concludes with the studies related to the recent novel studies on the encapsulation of blue phases [33], the stabilization of the encapsulated blue phases [34] and polymerizationinduced polymer-stabilized blue phase [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

From a Chiral Molecule to Blue Phases

Kemiklioğlu¹

2018

Liquid Crystals - Recent Advancements in Fundamental and Device Technologies

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Chiral molecules play an important role in a wide range from biological structures of plants and animals to chemical systems and liquid crystal display technologies. These molecules were used in different research fields due to their opaqueness and iridescent colors changes as a function of the variation in temperature after their discovery by Lehman in 1889. The iridescent colors and different optical textures of cholesterol make it attractive for the new study field of cholesteric liquid crystals. The direction of the cholesteric liquid crystals generates a periodic helical structure depending on the chirality of molecules. This helical structure might be right or left handed configuration and it is very sensitive to the external conditions, such as chiral dopant concentration and temperature. The variation in a helical structure, which was induced by these external conditions, had a great attraction for the scientists working on the chirality in liquid crystals and their applications. This chapter will provide a general introduction not only about the chirality in nature and its application in liquid crystals, especially in blue phases but also about the trends in the stabilization of blue phases and the investigation of their electro-optical properties for advanced applications in display, photonic devices.

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“…In particular, due to the efficient black state of the OI-NDLC, which is critical for improving the display visibility, the OI phase induced by the NDLC has several advantages over other OI LC modes such as relatively structurally unstable polymer-stabilized blue phase LC (BPLC) modes. [16][17][18][19] However, the volume fill-factor of LC nanodroplets, achievable with conventional PIPS approaches, is still too low, which is remains as a critical issue to be elucidated to avail all the unique properties of OI-NDLC mode. [13,20] The low LC fill-factor results in a lower Kerr constant and a higher operation voltage, which must be solved to realize practical applications.…”

Section: Introductionmentioning

confidence: 99%

Optically Isotropic Liquid Crystal Mode Templated by Nanoporous Breath Figure Membrane

Shin

Park

Joo

et al. 2022

Adv Materials Inter

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is improving its technological competitiveness with organic light-emitting diode (OLED) in almost every aspect of display technological issues such as visibility, resolution, panel power consumption, and color gamut, [1][2][3][4][5] the development of an innovative liquid crystal (LC) mode is still essentially required to enter novel display application fields such as curved, rollable, and flexible displays to compete with OLED's superior mechanical flexibility. [6] In contrast to OLED that is composed of thin organic solid layers, LCDs consist of fluidic LC molecules for transmittance level control by utilizing field-switchable birefringent effects. Thus, their electrooptical (EO) properties, such as transmittance in bright state, light leakage in dark state, contrast ratio (CR) levels, and LC texture uniformity, highly depend on the cell gap uniformity of LCDs, initial LC alignments, and LC geometries of the field-induced molecular reorientations. These LCD properties are highly sensitive to external stress conditions, such as local pressure and substrate bending because the LC orientations are distorted and the LCD cell gap is positionally varied under the externally deformed conditions.As an LC mode that is more suitable for flexible displays, the polymer-dispersed liquid crystal (PDLC) has been widely studied in LCDs. [7][8][9][10][11] The PDLC structure is a valuable approach in achieving flexible display applications due to its various advantages, including simple fabrication without requiring alignment layers, high mechanical stability by the polymer matrix, wide and symmetric viewing angle properties, and large-scale applicability. [10,11] Contrary to conventional LCDs, the LC molecules in the PDLC structure are formed within randomly dispersed LC droplets encapsulated within the polymer matrix, which also have random distributions in their effective optic axis. Accordingly, several types of the phase separation process have been proposed to obtain this PDLC structure. These include polymerization-induced phase separation (PIPS), thermally induced phase separation, and solvent-induced phase separation. [8,9] Among these, PIPS is one of the most widely used methods for fabricating the PDLC structure because the PDLC morphologies, such as the LC droplet size and density, can be controlled by varying the phase separation conditions, such as the relative molecular mixing ratio between the LCs and the prepolymers, In this study, a printing-based scalable method is proposed for the higher density of a liquid crystal (LC) nanodroplet structure suitable for the optically isotropic LC mode where the LC nanodomains are accurately templated by a nanoporous breath figure (BF) membrane. The highly porous BF polymeric template structure is reliably obtained by utilizing self-structured packing effects of the silica nanospheres achieved by doctor blade coating. A nanocomposite film with densely packed silica nanospheres encapsulated by the UV-crosslinked polymer matrix is made by controlling the blade coating velocity ...

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Polymer encapsulated and stabilised blue-phase liquid crystal droplets

Cited by 14 publications

References 23 publications

Engineered liquid crystal nano droplets: insights from multi-scale simulations

Engineered liquid crystal nano droplets: insights from multi-scale simulations

From a Chiral Molecule to Blue Phases

Optically Isotropic Liquid Crystal Mode Templated by Nanoporous Breath Figure Membrane

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