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Masaya Natsukari, Hiromichi Tejima, Kazuyuki Hiraoka, H. Kaneko, M. Su ...
Article type: Article
Session ID: PB12
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Recently, liquid crystalline elastomers composed of chiral mesogens have attracted both industrial and scientific interests because of their physical properties such as, pyroelectricity, ferroelectricity, and piezoelectricity owing to their local symmetry. It is worthwhile to notice that they are ideal materials for the investigation of piezoelectric effects in chiral smectic systems, because the polymer network prevents macroscopic flow which disturbs the emergence of piezoelectricity in the conventional low-molar mass ferroelectric liquid crystals. On the other hand, nanometer sized diamonds, designated as "nanodiamond", has been paid an increasing attention as a novel class of piezoelectric fillers because of the good dispensability owing to their surface electric charge. In this study, chiral smectic elastomers filled with nanometer sized diamonds are prepared, and the mesogenic alignments and the phase transition behavior are investigated. In addition, the spontaneous deformation responsible to re-alignments of mesogens in a heating and cooling process containing the SmA-Iso phase transition is discussed.
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Hiroya Nishikawa, Hiroki Higuchi, Yasushi Okumura, Hirotsugu Kikuchi
Article type: Article
Session ID: PB13
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Blue phases that appear in a very narrow temperature range between a chiral nematic and an isotropic liquid phase have three-dimensional periodic structures for visible light wavelengths. Therefore, blue phase liquid crystals have attracted much attention for their application to photonics devices. In this study, we prepared new photoresponsive binaphthyl derivatives having anthracene moieties which can photodimerize and dissociate and investigated how an induced chirality of a host liquid crystal changes by the change in configuration of chiral dopants before and after UV light irradiation.
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Shigeo Kohmoto, Ryo Nayuki, Masahiro Takahashi, Keiki Kishikawa
Article type: Article
Session ID: PB14
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Chiral propeller-patterned textures were generated spontaneously from achiral benzoic acid derivatives possessing diethyleneoxide tails. In order to investigate the origins of spontaneous chiral induction, we prepared several types of benzoic acids with modified tails. In addition, we have carried out a supramolecular approach to generate chiral propeller-patterned textures. Several H-bond acceptors, bipyridyl and pyrazine for example, were mixed with the benzoic acid derivatives and their phase behaviors were examined.
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Yuki Nagashima, Syusaku Nagano, Takahiro Seki
Article type: Article
Session ID: PB15
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Random copolymers containing cyanobiphenyl methacrylate and azobenzene methacrylate were synthesized by atom transfer radical polymerization (ATRP) method. Thin films of these polymers were prepared by spincoating method. UV-Vis spectroscopy and grazing incidence small angle X-ray scattering (GI-SAXS) measurement revealed that the orientation of mesogens in the thin films depended on copolymerization ratios. Also, block copolymers containing the random copolymerized mesogens were synthesized by ATRP method. Liquid crystalline (LC) phases and micro-phase separated structures of these polymers were investigated by GI-SAXS measurement. It is found here that the homeotropic and planar alignment of the LC phases can be switched by light irradiation.
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Keiki Kishikawa, Ryoichi Ohtsubo, Masahiro Takahashi, Shigeo Kohmoto
Article type: Article
Session ID: PB16
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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For achieving realization of ferroelectric columnar mesophase, we synthesized liquid crystalline urea-compounds. The compounds exhibited rectangular columnar and smectic A liquid crystal phases. We investigated their mesophases and structures by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and one- and two-dimentional X-ray diffractions (XRD). In addition, we investigated their ferroelectric switching behaviors by applying a triangular wave voltage. As a result, all compounds showed a response to the electric field but did not show ferroelectric behavior.
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Keiki Kishikawa, Kitaru Sato, Masahiro Takahashi, Shigeo Kohmoto
Article type: Article
Session ID: PB17
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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In order to realize ferroelectric columnar mesophases, we synthesized LC urea-derivatives. The compounds exhibited hexagonal columnar and rectangular columnar LC phases. We investigated their phase transitions and superstructures by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and one- and two-dimentional X-ray diffractions (XRD). In addition, we investigated their ferroelectric switching behaviors by applying a triangular wave voltage. As a result, some compounds indicated high-speed ferroelectric switching and stability of the polarization.
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Yutaro Miyazaki, Mikio Yasutake, Takuji Hirose
Article type: Article
Session ID: PB18
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Novel discotic liquid-crystalline materials were synthesized from triphenylene and hexabenzocoronene by attaching trialkylsilyl groups in the side chains. These compounds dissolved well in hexane, toluene, chloroform, diethyl ether and THF. DSC, POM and XRD measurements proved that triphenylene and hexabenzocoronene derivatives exhibit Col r and Col ho masophases respectively, over wide temperature ranges. Trialkylsilyl group was shown to be an effective flexible moiety of liquid-crystalline materials to improve solubility in organic solvents.
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Keiki Kishikawa, Tomohiro Watanabe, Masahiro Takahashi, Shigeo Kohmoto
Article type: Article
Session ID: PB19
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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To investigate the influence of molecular structure of dopants for stabilization of blue phases, we prepared dopant compounds which had different spatial arrangements of chiral mesogens, and they were added to 5CB, respectively. The mixture of 5CB with a tripodant compound showed the widest temperature range of the blue phase in this series, and compounds possessing two mesogens at o-, m- and p- positions of benzenes indicated a clear difference in the temperature range of the blue phase. We suggested the mechanism for stabilization of the blue phases.
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Emi UCHIDA, Yasuo NORIKANE, Reiko AZUMI, Kouji SAKAKI, Yumiko NAKAMURA ...
Article type: Article
Session ID: PB20
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We have reported on materials that show reversible photoinduced solid-liquid phase transition at room temperature; macrocyclic compounds possessing several azobenzenes in a backbone and alkoxy groups as side chains exhibit excellent photoresponsivity for change from crystal state to liquid state and stability of liquid state. Herein we report the thermal properties, photoisomerization, phase transition and molecular orientation of these liquid-crystalline cyclic azobenzene derivatives.
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Yuki Konuma, Akihiko Kanazawa
Article type: Article
Session ID: PB21
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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1,3-Dialkylureas with different alkyl groups were prepared and their thermotropic liquid-crystalline behavior was evaluated. In spite of the aliphatic compounds without disc-like molecular shape, these compounds were found to exhibit a columnar phase with two-dimensional hexagonal lattice on in which each column is built up from one-dimensional chains of hydrogen bond. In the urea based materials, we predicted that delocalization of protons along the one-dimensional chains of hydrogen bond is induced, resulting in useful channels for prototropy. Furthermore, we evaluated the electric conductivity of the dialkylurea thin films. The solid films with the columnar structure were found to show an ionic conductivity even under dry conditions.
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Kohei Sato, Yoshimitsu Itoh, Takuzo Aida
Article type: Article
Session ID: PB22
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We have reported that bio-mimetic cyclic peptides (S)-1_<chiral> and (R)-1_<chiral.> form a hexagonal columnar liquid crystalline (LC) mesophase, whose columns align unidirectionally along an applied electric field over a macroscopic length scale. We newly found that mixtures of (S)-1_<chiral> and (R)-1_<chiral> likewise form a hexagonal columnar mesophase, whose diagram is intact to the molar ratio of (S)-1_<chiral> to (R)-1_<chiral>, indicating the formation of homochiral columns in the resulting LC assembly. Meanwhile, newly designed 2_<meso> self-assembled into a hexagonal columnar mesophase, whose clearing temperature is much higher than that of 1_<chiral>.
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M. YAMAMOTO, Y. IIMURA
Article type: Article
Session ID: PB23
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Recently, flexible LCDs using plastic substrates are expected to become next-generation LCDs due to their lightweight and durability, etc. However, realization of high performance flexible LCDs are difficult to make because of weakness of plastic substrates against high process temperatures above 200℃. In this research, we report process technology of high performance flexible LCDs.
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Kyohei Tokuta, Rumiko Yamaguchi
Article type: Article
Session ID: PB24
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Properties of area coverage modulation have been studied in multidomain liquid crystal (LC) cells which show white and black lines between two polarizers. LC director distributions of +45° and -45° twisted nematic (±45° TN) aligned lines and a transmittance are numerically estimated around the boundary of white and black pixels in different conditions of line width and anchoring strength. In half tone area coverage modulation, the tone density of 50% is independent of anchoring strength and line width.
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Kazuya Goda, Taiki Watanabe, Tsutomu Katsumata, Toru Matsubara, Munehi ...
Article type: Article
Session ID: PB25
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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In the past, the hardness of alignment film has been estimated by Vickers hardness tester and nanoindentation tester. However, these testers are unsuitable to estimate the alignment film, which the thickness is less than 100nm, due to an influence of the base material and the adhesion between the base material and the film. In this study, the correlations between the hardness of alignment film by means of micro slurry-jet erosion test and the characteristics for the alignment of liquid crystal molecules will be demonstrated.
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Takeshi Ohe, Kazuya Goda, Munehiro Kimura, Tadashi Akahane
Article type: Article
Session ID: PB26
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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The rubbing treatment as a fabrication process of liquid crystal display (LCD) has been widely used. Advantages of rubbing process are wide area fabrication, fast processing, low cost, and so on. However, it is difficult to control the alignment process. Furthermore, rubbing treatment is a upper process of manufacturing LCD. Therefore, this disadvantage is considered to affect the yield rate of manufacturing LCD. In this study, the correlation between the rubbing-induced optical anisotropy and the tilt angle in the vertical alignment film will be investigated.
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M. Amano, T. Shime, T. Horiguchi, I. Shimokawa, S. Tashiro, S. Oka, S. ...
Article type: Article
Session ID: PB27
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Polymer-stabilized ferroelectric liquid crystals having V-shaped electrooptical characteristics (PSV-FLCs) can be obtained by polymerizing doped monomers in the SmA phase. In this study, we research the effect of alignment film on the monostability and the molecular orientation of PSV-FLC in term of the electrooptical characteristics and the texture observation. The degree of monostability depends on not only FLC and polymer materials and polymer concentration but also aligment film and further cell gap and photocuring condition.
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M. Shirao, Y. Yamamuro, Y. Koizumi, M. Ono, H. Furue
Article type: Article
Session ID: PB28
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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For liquid crystal displays, it is an ideal that the birefringence of liquid crystal medium does not vary in whole visible light region. Although the wavelength dispersion of the birefringence can be made small by utilizing a phase difference film, the precise control is needed for attachment of the film. In this research, in order to realize the phase-separated composite organic film (PSCOF) structure for the fabrication technology of liquid crystal display without using the phase difference film, we research in detail the fabrication condition of PSCOF liquid crystal cell.
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Takashi Terasawa, Taiju Takahashi
Article type: Article
Session ID: PB29
Published: 2012
Released on J-STAGE: June 01, 2017
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Novel type of bistable LCD by using the N
* LC material with Δε<0 is investigated. There is a possibility that an optical high contrast ratio is obtained, because the pure black image is simply able to obtain by using the vertical alignment state. Such as display holding time and the d/P
0 ratio to induce the bistable states are important parameters for the bistable LCD. In this paper, the observation and the evaluation of the display in the wedge shaped cell were carried out to achieve the improvement of display holding time when the cell thickness d and d/P
0 ratio were varied. As a result, the region of d/P_0 for obtaining the bistable state was extended within d/P
0=0.52〜0.84 (Δ[d/P
0]=0.32) in the cell with P
0=12.48μm, however, d/P
0=0.68〜0.94 (Δ[d/P_0]=0.26) in the cell with P
0=7.21μm.
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Mitsuhiro Akimoto, Naoki Atomi, Masashi Nishitateno, Kohki Takatoh, Sh ...
Article type: Article
Session ID: PB30
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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The Reverse Twisted Nematic (RTN) LCD uses the RTN LC director configuration which is realized by applying an AC voltage to a splayed twist cell. The RTN configuration is unstable which is not suitable for LCD operation. To stabilize the RTN configuration, we examine the polymer-stabilization method using UV curable liquid-crystalline monomers. When a test cell is irradiated uniformly with UV light, polymer network formed inside the cell stabilizes well the RTN configuration if the amount of monomers added into the host NLC material is sufficient, while the LCD performance gets worse terribly. On the other hand, it is found that the vertically-aligned polymer wall formed only nearby the cell edge also stabilizes the RTN configuration successfully, without degrading the LCD performance.
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Shinichi Nakamura, Taiju Takahashi
Article type: Article
Session ID: PB31
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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The BTN mode with the nematic LC with Δε<0 is known as one of the bistable LCD modes. The pretilt angle on the substrate is a low pretilt angle in this mode. In this paper, the BTN mode with the LC with Δε<0 was investigated. This type of the cell has a pretilt angle with almost normal to the substrate. And the director orientation is also vertical alignment without the applied voltage. When the voltage is applied, the director in the center of the cell is parallel to the substrate and the twisted structure appears. The fundamental electro-optical characteristics were measured.
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Yuki SANO, Syo ARAI, Taiju TAKAHASHI
Article type: Article
Session ID: PB32
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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The technique for controlling the pretilt angle for LC cells by the same alignment material over the wide region has not been established. Therefore, the measurement of the surface anchoring energy depend on the pretilt angle was difficult. In this report, the UV curable LC polymer film was used as an alignment film. The pretilt angle on this film can be controlled for wide region if the cure condition is changed. Then, the anchoring energies were measured and evaluated of nematic LC cells which were fabricated with varying the pretilt angles by using this technique.
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Tatsunari Kado, Taiju Takahashi
Article type: Article
Session ID: PB33
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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The bistable property is induced on the vertical alignment film by using the oblique irradiation technique of the polarized UV light has been reported by another group, and also it has been confirmed by our group. However, the bistable switching in the cell has not been successful so far. In this study, the bistable switching is attempted by the fabricating condition of the optical-alignment treatment is changed.
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Mitsuru KUZUWATA, Tomoyuki SASAKI, Kohei NODA, Hiroshi ONO, Nobuhiro K ...
Article type: Article
Session ID: PB34
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We present a simple yet efficient method to automatically fabricate the twisted nematic structure by one-step exposure on an empty glass cell coated with photocrosslinkable polymer liquid crystal (PCLC) films. The resultant photoalignment directions of two substrates can be orthogonal to each other by controlling the difference between the exposure energy for upper and lower PCLC films and the twisted nematic (TN) structure can be automatically fabricated. The vector grating liquid crystalline cell with TN structure was also fabricated by means of a developed method, and the diffraction properties were well explained by the theoretical calculation on the basis of Jones calculus.
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Yui Kimbara, Shoichi Ishihara, Sadahito Uto
Article type: Article
Session ID: PB35
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Hydroxypropyl cellulose (HPC) aqueous solution has a property of selective reflection. Because the selective reflection wavelength of HPC depends on a concentration of inorganic salts, the color of the HPC solution can be changed by an applied electric field that can move ions. In this study, we are trying to make a color tunable display device of HPC, which can change color freely by applied voltage.
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Marenori Kawamura, Eiji Yumoto, Shunsuke Ishiguro
Article type: Article
Session ID: PB36
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We propose a microscope system with a liquid crystal (LC) lens for continuously varying the focal plane and taking the magnification images of a three-dimensional (3D) object. The variable focal length can easily be controlled by applying the voltages to both two circularly hole-patterned electrodes and external flat electrode of the LC lens. The all-focused image and 3D distribution of the object can be obtained by using a digital image processing of the magnification images.
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Yoshiaki Suzuki, Ryouta Ito, Michinori Honma, Toshiaki Nose
Article type: Article
Session ID: PB37
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Useful measurement method of refractive indices in super high frequency electromagnetic wave region has been investigated by using coplanar waveguide (CPW) to achieve novel LC functional devices. However, inserted metal plate which acts as moving short dose not show stable propeties and rubbing effect is destroyed by the mechanical contacts in each measurement. In this work, a CPW is fabricated by using Si wafer and new measurement method is investigated by using optical short as a non-contact method.
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Yusuke Shiozaki, Yo Inoue, Yasuhiro Ogawa, Masaya Takahashi, Hiroyuki ...
Article type: Article
Session ID: PB38
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We report the lasing characteristics of a cholesteric liquid crystal (ChLC) laser with in-plane helix alignment utilizing a conducting polymer active layer. The purpose of this research is to improve lasing threshold of ChLC laser with in-plane helix alignment. Low threshold lasing compared with conventional in-plane helix aligned ChLC laser was achieved by utilizing the polymer active layer. It is considered that the optical gain was increased because almost all of the excitation light was absorbed at the polymer active layer.
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Ryouta Ito, Hiroto Asanuma, Takayuki Kumagai, Hiroyuki Yoshida, Tatsuo ...
Article type: Article
Session ID: PB39
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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THz electromagnetic wave has some unique properties such as penetration through various materials (paper, plastic, cloth etc.) and specific absorption band appears depending on materials (finger-print spectrum). There have been various studies for THz applications such as broadband communications, non-destructive testing and medical imaging. For the next phase of THz application, high quality of THz elements will be important. LC materials show relatively large refractive index anisotropy in THz region and they can have a potential application to some tunable devices. In this study, we investigate the new design scheme which includes the influence of absorption anisotropy in the THz LC components by using optically pumped submillimeter laser.
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Y. Nagatsuka, M. Kitadai, Y. Iimura
Article type: Article
Session ID: PB40
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We have proposed a new type of an electrically-controlled depolarizer that uses amorphous LC alignment structure. In this report, we have tried to reduce light scattering properties of an amorphous LC alignment structure by controlling the domain size. We prove that the low cooling rate to a nematic phase after isotropic injection of LC into a cell reduces the light scattering due to enlarging the domain size.
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Satoshi Aya, Le Van Khoa, Yuji Sasaki, Fumito Araoka, Ken Ishikawa, Hi ...
Article type: Article
Session ID: PB41
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We present a novel orientational wetting transition in a liquid crystal system, from a homeotropic (H) to planar (P) state, driven by an electric field (E-field). Previously, we have reported that a perfluoropolymer surface provides a curious surface phenomenon of liquid crystals, where an orientational change of molecules, referred to as anchoring transition (ATr), occurs on both cooling and heating. Here, we show the orientational dewetting transition of H state induced by an E-field in the system mentioned above is of strongly first-order, exhibiting a discontinuous H to P orientational transition on heating process. At a certain temperature near the ATr point, thickness of dewetted H layer grows and reaches cell thickness, suggesting a critical-like phenomenon.
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K. MASE, Y. IIMURA
Article type: Article
Session ID: PB42
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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An optical compensation method using stretched polymer films is now widely accepted for improving the image quality of LCDs. But the quality is not satisfactory to consumers, so that a new optical compensation method such as a pattered retarder is expected to be developed. In this study, we have reported buffer layer inserted between C-and A-plates composed of coatable UV-curable LC materials and the optical compensation of crossed polarizers using the film is also reported.
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Ryo Hori, Yohei Miwa, Katsuhiro Yamamoto, Shoichi Kutsumizu
Article type: Article
Session ID: PB43
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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A binary system of a bicontinuous cubic mesogen 4'-n-docosyloxy-3'-nitrobiphenyl-4-carboxylic acid with an azobenzene derivative 4-(4'-n-docosyloxyphenylazo)benzoic acid ethyl ester exhibits light-induced smectic C-bicotinuous cubic phase transition. We studied the transition dynamics by using grazing-incidence small-angle X-ray scattering and FT-IR measurements.
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Takahito Miyazawa, Akio Fujiwara, Yasuhisa Yamamura, Mafumi Hishida, S ...
Article type: Article
Session ID: PB44
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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4-Alkyl-4'-isothiocyanatobiphenyl (nTCB) exhibits SmE phase, as a mesophase. Although the SmE phase of nTCB is miscible with paraffin, the structure of the phase has not been characterized. To gain the structural information, wide-angle X-ray diffraction measurements were performed on the binary mixture between 9TCB and nonane. The resultant diffraction patterns show that the binary mixture exhibits structural characteristics of SmE phases. The layer spacing, c, remarkably varies with temperature while a and b within the layer do not. The structure of the swollen SmE phase will be discussed.
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S. Inoue, Y. Iimura
Article type: Article
Session ID: PB45
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Recently, a photo-alignment (PA) method attracts people's interest due to its noncontact and dust-free natures. The weak anchoring energy in a photo-aligned LCDs, however, impedes the application of the PA method to LCD production. In this report, we focus our attention to develop a PA method for IPS-LCDs, in which we use a newly developed photo-alignment material showing liquid crystallinity and photo-sensitive properties. The results show that the strong anchoring is obtained at low UV exposure, but weak at high exposure. On the other hand, the voltage holding properties are better in a high UV exposure sample than low exposure one. From these results, we propose a new double exposure method that will achieve the high anchoring and voltage holding properties simultaneously.
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Shinya Kashima, Atsushi Yoshizawa
Article type: Article
Session ID: PB46
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We prepared a host nematic liquid crystal consisting of a practical nematic liquid crystal mixture E7 and a small amount of a designed phenylpyrimidine oligomer. The oligomers under investigation were linear and U-shaped dimers, and T-shaped and λ-shaped trimers. We investigated phase transition behavior of each host liquid crystal doped with a chiral dopant possessing high helical twisting power. All the mixtures showed a phase sequence of isotropic liquid-bulue phase III-chiral nematic. Particullarly both trimers were found to show the marked effect on widening the BPIII temperature range.
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Daisuke Itakura, Kenji Urayama, Toshikazu Takigawa
Article type: Article
Session ID: PB47
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We prepare the cholesteric liquid crystal elastomers (Ch-LCE) using the chiral imprinting method. The Ch-LCEs exhibit selective reflection at characteristic wave lengths resulting from the periodic herical mesogen alignment. The macroscopic dimensions and the characteristic wave length for selective reflection are investigated as a function of temperature.
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Kosuke Kaneko, Hiroki Higuchi, Hirotsugu Kikuchi
Article type: Article
Session ID: PB48
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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There has been great interest recently in the fabrication of metal nanoparticles/liquid crystals composites. In this study, we investigate the expansion of temperature range and the improvement of the electro-optical properties of blue phases by doping with gold nanoparticles. Gold nanoparticles with mesogenic coatings are prepared in order to obtain good dispersity and miscibility of the nanoparticles into liquid crystals. We report the results of detailed electro-optical studies using the gold nanoparticles which facilitate further applications of hybrid materials, and the method of the improvement in the miscibility of the nanoparticles into liquid crystals is examined from the viewpoint of material design.
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Makoto Yoneya, Takayoshi Makabe, Yasuo Miyake, Hiroyuki Yoshida, Yo Sh ...
Article type: Article
Session ID: PB49
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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Structure of a liquid crystalline (LC) phase of a non-peripheral octa-alkyl substituted phthalocyanine derivative was investigated by molecular dynamics (MD) simulations. Columnar hexagonal LC phase was spontaneously obtained with heating-up MD simulation stating with the crystal structure obtained by X-ray diffraction study. In the simulated structure, the phthalocyanine core normal vectors are tilted 46° from the column axis within each column, but the tilting directions are disordered between columns.
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Yuki Koeduka, Mizuho Kondo, Masahiro Funahashi, Nobuhiro Kawatsuki
Article type: Article
Session ID: PB50
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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New oligothiophene derivatives were synthesized and their carrier mobilities were investigated by TOF technique. Further, molecular orientation of oligothiophenes on photoalignment film was evaluated.
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Takeshi Hayashi, Takashi Saito, Shouhei Nakano, Fabien Nekelson, Toshi ...
Article type: Article
Session ID: PB51
Published: August 20, 2012
Released on J-STAGE: June 01, 2017
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We have studied on carrier mobility and thermal properties of metal 1, 4, 8, 11, 15, 18, 22, 25-octahexylphthalocyanine. The thermal properties were investigated by differential scanning calorimetry (DSC) and polarized optical microscopy. By using copper or nickel as a center metal, the discotic columnar phases appeared. The voltage and temperature dependences of carrier mobility were measured by the time-of- flight technique and discussed about ambipolar properties by comparing with metal-free 1, 4, 8, 11, 15, 18, 22, 25-octahexylphthalocyanine.
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Article type: Index
Pages
Index1-
Published: 2012
Released on J-STAGE: June 01, 2017
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Article type: Appendix
Pages
App5-
Published: 2012
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