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原稿種別: 付録等
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発行日: 2023年
公開日: 2024/06/01
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原稿種別: 付録等
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発行日: 2023年
公開日: 2024/06/01
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原稿種別: 付録等
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発行日: 2023年
公開日: 2024/06/01
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福田 順一
セッションID: 1AO1
発行日: 2023年
公開日: 2024/06/01
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We study numerically how the structural phase transition from a perfectly ordered cholesteric blue phase (BP) II to BP I occurs in real space, using a Langevin-type equation of motion for the orientational order parameter of a second-rank tensor. Experimentally observed twin structures of BP I are reproduced numerically as well, and it is demonstrated that the transformation from BP II to BP I is initiated by the formation of BP I nuclei from the background BP II. The transformation from twinnedBP I to BP X under an electric field is also discussed.
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髙西 陽一
セッションID: 1AO2
発行日: 2023年
公開日: 2024/06/01
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It was found that the helical pitch in the SmC* phase becomes shorter when an ionic liquid is mixed with a ferroelectric liquid crystal (FLC). Based on the phenomenological theory related to the SmA-SmC phase transition by Pikin & Indenbom, related physical parameters to the helical pitch are considered to be the elastic constant, the spontaneous polarization, the tilt angle, the flexoelectric coefficient, and so on. Hence, we evaluated these physical properties experimentally, and discussed the mixing effect of ionic liquids on the helical pitch of FLCs.
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藤田 正博
セッションID: 1BI3
発行日: 2023年
公開日: 2024/06/01
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A plastic crystal is a kind of mesophase and represents a state in which the positions of the molecules/ions are ordered but their orientation is not ordered. Ionic plastic crystals are soft solids and are expected to have applications in electrochemical devices such as Li-ion batteries and capacitors because of their properties such as excellent thermal stability and ionic conductivity. Recently, the authors have been vigorously working to deepen the understanding of the correlation between the molecular structure and physicochemical properties of ionic plastic crystals to develop soft high-performance solid electrolytes. This presentation introduces the structural characteristics and fundamental physicochemical properties of ionic plastic crystals.
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藤井 修治
セッションID: 1BI4
発行日: 2023年
公開日: 2024/06/01
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We study yielding behavior of adzuki beans paste under oscillatory shear. PIV analysis showed that the granules form clusters under the oscillation. In spite of the cluster formation of the granules, the dynamic moduli showed decrease with the strain amplitude. The cluster formed under the oscillation might be a local structure and thus do not contribute the modulus.
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桑折 道済, 小見山 夏緒, 大窪 貴洋, 一國 伸之, 尾原 幸治, 三輪 洋平, 沓水 祥一, 岸川 圭希
セッションID: 1BO1
発行日: 2023年
公開日: 2024/06/01
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In this study, we focused on holmium (Ho), one of the lanthanide elements with excellent magnetic properties, and prepared a liquid crystalline metal complex with Ho as the central metal. The seven-coordinated Ho complexes, consisting of three β-diketone-type ligands with alkoxy side chains and one water molecule, exhibited a micellar cubic liquid crystal phase at room temperature, which is composed of a supramolecular sphere based on three Ho complex molecules. The obtained Ho complex exhibited an excellent magnetic response to a neodymium magnet and was shown paramagnetic by SQUID measurements.
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佐々木 弘毅, 的場 翔太郎, 内田 幸明, 西山 憲和
セッションID: 1BO2
発行日: 2023年
公開日: 2024/06/01
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Chemical sensors have targeted a wide variety of substances. Whereas most sensors electrically amplify signals, we propose a system that uses a hyperswollen lamellar phase to directly detect targets in solution with the naked eye here. The oligoethylene glycol chain of the amphiphile, whose solutions can show hyperswollen lamellar phases, traps alkali metal and alkaline earth metal ions. The phase transition due to the association of ions and amphiphiles allows the detection of ions as a change in macroscopic birefringence.
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大園 拓哉, 小山 恵美子
セッションID: 1CO1
発行日: 2023年
公開日: 2024/06/01
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Modulation of the nematic order by photo-isomerization of azobenzene units incorporated into nematic liquid crystal elastomers alters the mechanical properties and generate stress or strain change. The conditions that elicit the most significant variation in the photomechanical stress or strain with respect to the operating and photo-switchable phase transition temperatures are explored and discussed.
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坊野 慎治, 小西 聡
セッションID: 1CO2
発行日: 2023年
公開日: 2024/06/01
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We investigated the rotational and translational motion of liquid crystal droplets (LCDs) dispersing on microstructured electrodes to visualize the electric field distribution. LCDs under electric fields show rotational behavior depending on the positions of LCDs. Moreover, LCDs show translational motion with an increasing electric field. After a comparison between numerical calculation and experimental results, we succeeded in visualizing the electric fields and the electrostatic energy density on microfabricated electrodes. The detection accuracy and the spatial resolution are 5 V m1 and 10 m, respectively.
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太田 最実, 鍋谷 俊太, 上久保 真紀, 佐藤 文紀, 深港 豪, 栗原 清二
セッションID: 1LO1
発行日: 2023年
公開日: 2024/06/01
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We demonstrated a new transparent display which consists of an optically switchable transparent polymer network liquid crystal (PNLC), UV LED and visible projector. UV irradiation changed the PNLC film from the transparent mode to the screen mode. Also, blue light returned it from the screen state to the transparent state. This switching was achieved by the change of helical twisting power (HTP) between trans and cis state of azobenzene mixed with liquid crystal.
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坂井 彰
セッションID: 1LO2
発行日: 2023年
公開日: 2024/06/01
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As the trend of display technology shifts from LCDs to OLEDs, there is a need to reconstruct development strategies to ensure the survival of LCDs. In this presentation, we will introduce specific examples of new technologies in the automotive and AR/VR markets, where the LCD market is expected to grow, of the development of feature technologies that can be realized only with LCDs or in which LCDs have an advantage at present. We will also introduce nanoLED technology, which we position as the next-generation self-emissive display.
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岩本 宜久, 桐田 英和
セッションID: 1LO3
発行日: 2023年
公開日: 2024/06/01
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Summary: In order to realize a headlamp system that makes it easy for the driver to find people on opposite side of the car, even from a distance, and that the people on the opposite side do not feel glare, we have developed a liquid crystal module to be installed as a core component in the LCD-ADB (Adaptive Driving Beam ) headlamp system. In this report, we demonstrate a method for achieving high transmission while seamlessly controlling the necessary and sufficient resolution for the light irradiation pattern, achieving the required performance such as a wide operating temperature range suitable for headlamps and durability performance.
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岡 俊彦
セッションID: 2AO1
発行日: 2023年
公開日: 2024/06/01
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Liquid crystal bicontinuous phases with three-dimensional periodicity, such as gyroid phase, have been measured by diffraction. However, there is no established method to determine the phases of the structure factors necessary to restore electron density. In this presentation, I show a method for determining the electron density distribution by retrieving the phase from diffraction data. Application to powder diffraction data is also discussed.
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岡 俊彦, 山村 泰久, 齋藤 一弥, 沓水 祥一, 大野 稜貴, 三輪 洋平, 橋本 慧
セッションID: 2AO2
発行日: 2023年
公開日: 2024/06/01
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Aggregation structure of chiral cubic phase spontaneously formed by achiral rodlike molecules, a long-time unsolved problem in liquid crystal science, has been clarified by applying a new crystallographic algorithm recently developed. The presence of two interwoven networks of 3-connected junctions is found common to the neighboring Gyroid phase in a phase diagram as a function of the alkyl chain length and temperature. The space group determined is I2_13. The network is compatible with the homochiral arrangement of rodlike molecules with successive twists by a proper angle between adjacent junctions.
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齋藤 一弥, 山村 泰久
セッションID: 2AO3
発行日: 2023年
公開日: 2024/06/01
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Inspired by the recent finding of the twined noh structures in a chiral cubic phase of thermotropic mesogens, we explore the possibility of the fundamental importance of network geometry by analyzing the junction ideality and spatial homogeneity. The twinned noh nets are superior to other candidate nets within the cubic symmetry except for the srs twins of the gyroid phases. The successful description based on net geometry implies that the cubic phases, both the achiral gyroid phase and chiral I213 phase, of rodlike molecules are well characterized as spatially-organized networks of twist segments of molecules.
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伊藤 裕貴, 吉岡 潤, 深尾 浩次
セッションID: 2AO6
発行日: 2023年
公開日: 2024/06/01
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The Marangoni convection driven by temperature gradient in cylindrical droplet near phase transition points was investigated in some liquid crystals of cyanobiphenyl series. By using photo-bleaching method, we confirmed the existence of the characteristic flow near air interface in the coexistence state of different phases. In the 5CB, the flow direction on the interface is from isotropic to nematic phase, that is, the inverse flow direction in the 7CB. It is considered that the cause of these flows is different temperature dependence of surface tension for each sample.
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山村 泰久, 齋藤 一弥
セッションID: 2AO7
発行日: 2023年
公開日: 2024/06/01
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Recently, we have reported two molecular packing modes of the alkyl chain in SmA liquid crystal phases: normal and tilted types, which are named by the orientation relative to the layer normal. A relation between the molecular packing modes and the nature of the SmA-N phase transition is examined. The results of thermodynamic and structural experiments indicate that the phase transitions of the normal and tilted types are of second and first order, respectively, and that the molecular packing modes are crucial for the nature of the SmA-N phase transition.
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河合 一輝, 茂山 友樹, 松本 浩輔, 堤 治
セッションID: 2AO8
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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This study focuses on the synthesis of monodisperse cross-linked liquid-crystalline polymer particles with precisely controlled mesogenic alignment. These particles exhibit unique material properties based on their molecular orientation, particularly in relation to optical and thermal properties. The introduction of the cross-linked structure into the particles offers advantages such as external stimulus response and environmental stability. However, conventional methods for introducing the cross-linked structures often result in polydispersity or the loss of their molecular orientation. In this study, we propose new methods for synthesizing cross-linked liquid-crystalline polymer particles that overcome these problems, achieving monodisperse particles controlled their molecular orientation.
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吉岡 潤
セッションID: 2AS9
発行日: 2023年
公開日: 2024/06/01
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円柱状のコレステリック液晶滴における構造形成過程を解析した。温度勾配を印加しつつ滴に特定の昇降温操作を施すことで、リング状の線欠陥の発現および組み換えを通して、最終的に形成される構造が変化した。温度勾配が存在することで、構造形成と同時にレーマン回転と呼ばれる特徴的な回転現象が誘起された。これらの非自明な非平衡現象は、温度勾配印加によって発生したマランゴニ対流によって誘起されたものと考えられる。
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西川 浩矢, 荒岡 史人
セッションID: 2BO1
発行日: 2023年
公開日: 2024/06/01
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To gain a comprehensive understanding of the manifestation mechanism of ferroelectric liquid crystal (FLC) phases, including the ferroelectric nematic phase, and to advance the development of cutting-edge FLC-based devices, effective screening of various FLC molecules is imperative. In this study, we implemented mechanochemical synthesis using a ball mill and successfully demonstrated a rapid, solvent-minimized, and sustainable method for screening FLC molecules. Utilizing this approach, we achieved high yields of both known and novel FLC molecules within a timeframe of 2-7 hours, involving 4-8 steps. Herein, we present detailed manufacturing methods and physical properties of the synthesized molecules.
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大野 滉太, 須賀 健介, 御代川 克輝, 原 光生, 齊藤 尚平
セッションID: 2BO2
発行日: 2023年
公開日: 2024/06/01
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To develop soft materials with strong non-hydrogen bond interactions, we introduced electron-deficient π-system and long alkyl chains into a V-shaped molecule that forms tight columnar stacking. This compound exhibited liquid crystal properties at room temperature, and it works as a pressure-sensitive adhesive for glass substrates. In this presentation, we will discuss synthesis, packing structures, thermal phase transitions, and viscoelastic properties of the pressure-sensitive adhesive.
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相沢 美帆
セッションID: 2BS3
発行日: 2023年
公開日: 2024/06/01
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空間選択的な光照射により分子配向を制御する動的光重合法を開発し,さらにこの研究過程で周期構造体が自己組織的に形成することを見出した。また,この自己組織化を利用した配向法という概念を基にコラーゲン分子の大面積配向制御にも成功した。本講演では,分子配向制御を基盤とした液晶高分子フィルムの機能化に関する研究として,動的な光照射により作製した光学機能材料およびコラーゲンからなる高強度フィルムを紹介する。
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佐藤 弘志
セッションID: 2BI4
発行日: 2023年
公開日: 2024/06/01
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1D hybrid metal-organic frameworks (MOFs) are attractive if they consist of different MOF blocks with interconnected channels. Here, we propose the "photochemical surgery" method, which combines top-down and bottom-up approaches. When photoreactive DTEMOF, for example, was exposed to UV light through a photomask in a solvent, the unmasked part was removed via solubilization to produce a gap. The resulting specimen was immersed in a solution containing the necessary components for constructing DTZEMOF. Eventually, the gap was filled with DTZEMOF to form a triblock hybrid MOF (DTEMOF-DTZEMOF-DTEMOF). "Photochemical surgery" can be applied to synthesize 1D hybrid MOFs bearing unconventional sequences and morphologies.
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秋山 吾篤, 桑折 道済, 岸川 圭希
セッションID: 2BO6
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
認証あり
Establishing a methodology to control the properties of ferroelectric columnar liquid crystals (FCLCs) is key to utilizing them as materials. This study demonstrates that mixing is an effective approach for tuning ferroelectric properties. Novel FCLC materials were realized by mixing urea molecules with a small steric hindrance showing pyroelectricity and a large steric hindrance showing little electric-field responsiveness. The two different molecules are stacked alternately due to steric effects, exhibiting a stable hexagonal columnar phase. Depending on the mixing ratio, the intermolecular hydrogen bonding strength could be tuned, and the coercive field and spontaneous polarization were controlled by temperature.
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中尾 汰紋, 松本 浩輔, 堤 治
セッションID: 2BO7
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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Aggregation-induced emission (AIE) materials have been expected to be applied as luminescent materials. So far, we have synthesized liquid-crystalline trinuclear Au complexes and reported their AIE behavior. Furthermore, we have found that luminescence properties of those complexes depending on the length of the alkyl side-chains. In this study, we introduced the branched side-chains via ester linkage and discussed the relationship between their structure and photophysical/thermal properties. The melting points of complexes were lowered by the introduction of the branched side-chains. In particular, the complex with the longest branch, E-Hex, showed the melting point at -15 °C and discotic nematic phase (ND) in extremely wide temperature range. These Au complexes exhibited strong phosphorescence with AIE properties at room temperature.
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東谷 智博, 松本 浩輔, 堤 治
セッションID: 2BO8
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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Chiral-nematic liquid crystals (N*LC) exhibit a helical molecular orientation that selectively reflects light based on their helical pitch. External stimuli can alter the helical pitch, making them ideal sensing materials. Recently, we have achieved quantitative detection of out-of-plane strain by developing strain sensors using N*LC elastomer films. Additionally, we successfully synthesized N*LC microparticles with radially aligned helical axes, enabling the detection of three-dimensional strain. However, the glass transition temperature (Tg) of these particles was 40 °C, limiting strain measurements to temperatures at room temperature. In this study, we developed N*LC microparticles with a Tg below room temperature to investigate their molecular orientation and optical properties under strain.
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児島 敬子, 神徳 啓邦, 桒原 有紀, 相沢 美帆, 山本 貴広, 室賀 駿, 小橋 和文, 岡崎 俊也
セッションID: 2BO9
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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Single-walled carbon nanotubes (SWCNTs) are tubular carbon allotropes with high electrical conductivity and high tensile strength which appear along the tube directions, therefore, the control of SWCNT orientation in materials is very important. Liquid crystalline SWCNT dispersions are expected to be the raw materials of highly oriented SWCNT materials. However, the liquid crystal (LC) phase behaviors of SWCNT aqueous dispersions hadn’t been discussed in detail. In this study, we investigated the preparation process of rod-like SWCNT dispersions which are suitable for SWCNT LC by differential centrifugal sedimentation (DCS) method. Furthermore, we achieved the first report of the direct observations of Schlieren textures of SWCNTs in liquid phase.
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Soberats Bartolome
セッションID: 2BO10
発行日: 2023年
公開日: 2024/06/01
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Herein we present two new core N-substituted Naphthalene diimides (NDIs) (1 and 2) that form unprecedented columnar liquid-crystalline (LC) J-aggregates. NDI-1 spontaneously assembles into an unconventional columnar J-aggregate where the dyes organize with the cores parallel to the columnar axis via hydrogen bonds and slipped π-π interactions. On the other hand, NDI-2 self-assembles into conventional columnar LC H-aggregates, but its conversion into J-aggregates was achieved by mechanical shearing of the sample, which induces a blue shift of the main absorption band and a fluorescence light-up. We describe for a first-time the preparation of LC NDI J-aggregates with great potential as optical materials.
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舟橋 正浩, 上村 忍
セッションID: 2CO1
発行日: 2023年
公開日: 2024/06/01
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We synthesized terthiophene derivatives bearing lactic dimer units. These compounds exhibited chiral ordered smectic phases at room temperature. In the ordered smectic phase, a macroscopic polarization was induced by a DC bias application during the phase transition from the isotropic to the smectic phase. In the polarized states, the bulk photovoltaic effect was observed in these compounds. In particular, the fill factor and durability of the photovoltaic cell were improved because of the suppression of the thermal motion of the side chains.
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清水 洋, 山本 理人, 須藤 涼大, 太田 昇, 川野 幸稀, 藤井 明彦, 内田 欣吾, 河合 壯, 尾﨑 雅則
セッションID: 2CO2
発行日: 2023年
公開日: 2024/06/01
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Synchrotron radiation XRD technique was applied to analyze the nano-structure of the composites of a liquid crystalline semiconductor (9TNAT9) and poly(3-hexylthiophene) (P3HT), which exhibit the highest level of hole mobility for the well-aligned P3HT reported so far. It was indicated that an amount of 9TNAT9 resolved in P3HT surely enhances the - interaction among polymer backbones, probably due to partial pinning of the polymer chains caused by 9TNAT9 molecules.
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関 淳志, 青木 健一
セッションID: 2CO3
発行日: 2023年
公開日: 2024/06/01
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In this study, we evaluated the phase transition behaviors and electronic properties of π-conjugated compounds bearing distinct chiral branched-alkoxy chains. The ferroelectric bulk photovoltaic effect (FePVE) in the polarized structure of chiral ordered smectic phase was confirmed. In this presentation, we will discuss the influence of the molecular structures upon the structural fixation through phase transition in the presence of external electric field. We will also explain the improvement of the output performance for the FePVE by the efficient fixation of polar structure.
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冨岡 安, 國松 登, 袋 裕善, 遠藤 秀幸, 長瀬 裕
セッションID: 2CS7
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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IPS(In-Plane Switching)-LCDには、開発当初からラビング配向処理に起因する生産上の課題に加えてコントラスト比低下等の画質性能面の課題があり、それを解決するため非接触の光配向技術への大きな期待があった。ここで紹介するIPS光配向量産技術は、IPS-LCD実用化に向けた重要な指標であるAC残像特性と生産能力の指標である光感度に着目して、最適な光配向方式の選定と材料プロセスの改良を図り、IPS-LCDの画質性能向上と高い量産性を実現したものである。
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平野 幸夫
セッションID: 2CO8
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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Many serious problems related to flicker phenomena in fringe-field switching liquid crystal displays (FFS-LCDs) remain unresolved, and the Vcom shift is difficult to explain due to the flexoelectric effect. We studied the Vcom shift using COMSOL Multiphysics simulations considering material properties, transport phenomena of ions, electric double layer at interface and flexoelectric effect and found that the Vcom shift is affected by the potential of the liquid crystal layer, the alignment layer, and the SiNx layer, and the interface charge between these materials.
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吉田 尚生, 山口 留美子, 田中 達士
セッションID: 2CO9
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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The same liquid crystal alignment configuration of a conventional 90° twisted nematic LC display cell can be obtained in a twisted hybrid alignment liquid crystal cell, when the polar anchoring strength of the homeotropic surface is lower than a critical one. We call that a Quasi-Twisted Nematic mode. We have numerically clarified relations between the pretilt angle on the strong planer anchoring surface and electro-optical property. By selecting the appropriate polar anchoring strength of the homeotropic surface, the high transmittance in the voltage off and the low voltage drive are possible.
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木谷 達郎
セッションID: 2CO10
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
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Colored polymer dispersed liquid crtstals have been proposed. However it has been reported that some dichroic dye was bleached in the process of photo-polymerization by irradiating the UV light. We have investigated the photo-bleaching in the liquid crystal E7 with some dyes and photoinitiators and found that the photo-bleaching of blue dichroic dye AB2 did not occur when using the photoinitiators of OXE01 and OXE02, but Irg184 and Irg907. Orange dye of AO1 and yellow dye of AG1 did not bleached by using all photoinitiators used in this study.
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佐々木 健夫
セッションID: 2SO1
発行日: 2023年
公開日: 2024/06/01
会議録・要旨集
認証あり
In this study, a novel laser ultrasonic measurement system using liquid crystals was developed. A laser pulse is irradiated to a material to generate an ultrasonic vibration. Another laser beam is irradiated to the material to detect the vibration. The ultrasonic vibration of the material surface shifted the phase of the laser beam reflected by the material. Liquid crystals exhibiting a photorefractive effect were used to detect the phase shift. Compared to the conventional laser ultrasonic method, the optical system is more straightforward, and accurate measurement is possible without being affected by vibrations in the measurement environment.
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小野 浩司
セッションID: 2SO2
発行日: 2023年
公開日: 2024/06/01
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In photonics, the need to manipulate polarized optical signals has grown due to advancements in light sensing, imaging, recording, laser processing, and optical communications. This has sparked interest in geometric phase optical elements (GPOEs) for polarization control. Unlike conventional phase optical devices, polarization photonic devices operate by locally modifying the geometric phase of light-waves passing through them, using spatial modulation of optical anisotropy. Liquid crystals have emerged as an important material for generating polarization photonic functions due to their structural flexibility and high orderliness at molecular and bulk levels. This lecture summarizes the past and present studies on polarization photonics, covering both fundamentals and applications.
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田頭 健司
セッションID: 3AS2
発行日: 2023年
公開日: 2024/06/01
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伝法谷 莉南
セッションID: 3AO3
発行日: 2023年
公開日: 2024/06/01
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Three-dimensional liquid crystal (LC) molecular orientations of an LC lens with a highly resistive layer coated on the ring electrodes were reported. Fresnel lens type refractive index has been realized by adjusting the applied voltages across the patterned electrodes and the common electrode. In this study, the azimuthal angle distribution of the LC lens with Fresnel lens type refractive index are calculated and the lens properties are evaluated when elastic constants of the LC material are changed.
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坂本 盛嗣, 大原 空, 三星 陽平, 野田 耕平, 鈴木 雅人, 佐々木 友之, 川月 喜弘, 小野 浩司
セッションID: 3AO4
発行日: 2023年
公開日: 2024/06/01
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Although liquid crystal polarization grating (LCPG) has a lot of attractive applications such as augmented reality and polarization imaging, most of the LCPG are optimized for visible wavelength. LCPG optimized for infrared (IR) wavelength should open new applications such as IR polarization spectroscopy and IR polarization imaging. In this presentation, we tried to fabricate LCPG optimized for infrared (IR) wavelength.
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垣内田 洋, 胡 致維, 荻原 昭文
セッションID: 3AO5
発行日: 2023年
公開日: 2024/06/01
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Smart windows are often installed in the vicinity of outdoors and could be exposed to severe thermal environments, depending on climate, weather, and location. We have worked on polymer network liquid crystals (PNLC) for the application to thermoresponsive switchable windows and have improved the durability at low- and high-temperature environment. The PNLCs were improved by using liquid crystal (LC) mixtures, not to leave white spots therein after experiencing cold condition. They were improved by adjusting compositional ratios of LCs to reactive mesogens, to increase the temperature transforming haze to transparence back during the rise in temperature.
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門脇 優子, 吉田 万里映, 今井 順平, 宇部 達, 池田 富樹
セッションID: 3AO6
発行日: 2023年
公開日: 2024/06/01
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We doped a photoresponsive molecule, oxa bridged azobenzene (O-B-Azo), into chiral nematic liquid crystals (LCs). When the mixture was exposed to visible light, O-B-Azo exhibited photoisomerization behavior in LCs, which was accompanied by an isotropic to chiral nematic phase transition of the mixture. In addition, we prepared a smart window composed of host LCs and O-B-Azo. The smart window showed a less colored and transparent initial state. Transmittance of the device decreased upon exposure to visible light, and the smart window quickly reverted to the transparent initial state in the dark.
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塚本 脩仁, 尾﨑 雅則
セッションID: 3AO7
発行日: 2023年
公開日: 2024/06/01
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We develop a control method of pretilt angle using a surface modification of polyimide film by ultra-violet (UV) irradiation. This study fabricates a liquid crystal (LC) light wavefront control device with periodic pretilt angle distribution by this alignment method and evaluates the electro-optical properties.
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高頭 孝毅, 小林 美夏, 伊藤 雅浩
セッションID: 3AO8
発行日: 2023年
公開日: 2024/06/01
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For light shielding, it is preferable to cut only the light from above. The optical filters possessing asymmetric dependences on the incident angle direction could be realized. The filters contain LC films of HAN-LC type structure which could be produced by using dichroic dye and LC monomer. Two types of the filters are proposed. One is composed of one HAN-LC film and a polarizer. Another is composed of two HAN-LC films and a half wave plate. These filters can be used for sunglasses, windows in cars and buildings and other applications.
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Lang Trong Nghia, 井上 曜, 森武 洋
セッションID: 3AO9
発行日: 2023年
公開日: 2024/06/01
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Phased array antenna is a well-known system that has the unique ability to change its radiation patterns such as direction and shape, without physically moving. In this study, by utilizing microfiber/liquid crystal composite, we succeeded in realizing two terahertz wave phased array antennas for 100 GHz band frequency: one with a high gain of about 15.8 dBi and continuous steering angles up to ±28°, and the other with a smaller gain of about 14.3 dBi but larger steering angles up to ±42°.
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井上 曜, 鹿田 建普, 森武 洋
セッションID: 3AO10
発行日: 2023年
公開日: 2024/06/01
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LC-based non-mechanical beam steering has attracted considerable interest in recent years because of the urgent need from sensing technology such as light detection and ranging (LiDAR) for self-driving cars. The most well-known LC-based non-mechanical beam steering method is the diffraction-type device (optical phased array). However, the diffraction type has drawbacks in beam splitting, discontinuous angle control, availability limited at a single wavelength, response speed, and a small steering angle. In this study, we demonstrate a refraction-type LC beam steering device with continuous beam control, wide-band availability, and high scan rate.
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緒方 真希, 森本 涼太, 松本 浩輔, 下ノ村 和弘, 堤 治
セッションID: 3BO1
発行日: 2023年
公開日: 2024/06/01
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Pressure sensing technologies have attracted much attention in various fields such as robotics, healthcare, and human-machine interfaces. Chiral nematic liquid crystalline polymers, known for their unique optical and mechanical properties, hold promise for pressure sensing devices. This study explores the potential of chiral nematic liquid crystalline polymers for such applications. These materials exhibit a twisted helical structure, resulting in distinctive optical properties like selective light reflection. By incorporating them into polymeric matrices, pressure-induced changes in the molecular orientation can be utilized for sensing, enabling visualization of pressure variations through color or optical changes. The investigation involves synthesizing and characterizing tailored chiral nematic liquid crystal polymers and evaluating material performance.
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小倉 淑希, 秋山 吾篤, 桑折 道済, 岸川 圭希
セッションID: 3BO2
発行日: 2023年
公開日: 2024/06/01
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Ferroelectric columnar liquid crystals (FCLCs) are promising materials for sensors and memory. We reported that a diphenylurea molecule with chiral side chains generate an FCLC phase, but the details of the mechanism remained unclear. In this study, we prepared four molecules in which each of the chiral chains at the phenyl group was regioselectively introduced, and investigated the correlation between the ferroelectricity and the arrangement of the chiral groups. As a result, it was clarified that the introduction of the chiral chains at specific positions plays a significant role in stabilizing the intra-column structure, which in turn influences the ferroelectricity.
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