The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform

Katsumi Yoshino - One of the best experts on this subject based on the ideXlab platform.

  • Novel properties of conducting polymer-liquid Crystal System and their doping effect
    Synthetic Metals, 1995
    Co-Authors: K. Kobayashi, Xiao Hong Yin, Masanori Ozaki, Tsuyoshi Kawai, Katsumi Yoshino
    Abstract:

    Summary form only given. Two type of System, conducting polymer-nematic liquid Crystal System and conducting polymer-ferroelectric liquid Crystal System were prepared by casting the solution with common solvent. Soluble conducting polymers such as poly(3-alkylthiophene) and poly(9,9-dialkylfluorene) were used in this study. The structure of the System observed by a microscope was strongly dependent on concentration of liquid Crystal and molecular structures of conducting polymer and liquid Crystals. Electrical properties such as dielectric response and optical properties were strongly dependent on the concentration of liquid Crystal and correlated with the structure of the System. Electro-optic effect characteristic to these conducting polymer-liquid Crystal Systems and doping effects were also clarified.

K. Kobayashi - One of the best experts on this subject based on the ideXlab platform.

  • Novel properties of conducting polymer-liquid Crystal System and their doping effect
    Synthetic Metals, 1995
    Co-Authors: K. Kobayashi, Xiao Hong Yin, Masanori Ozaki, Tsuyoshi Kawai, Katsumi Yoshino
    Abstract:

    Summary form only given. Two type of System, conducting polymer-nematic liquid Crystal System and conducting polymer-ferroelectric liquid Crystal System were prepared by casting the solution with common solvent. Soluble conducting polymers such as poly(3-alkylthiophene) and poly(9,9-dialkylfluorene) were used in this study. The structure of the System observed by a microscope was strongly dependent on concentration of liquid Crystal and molecular structures of conducting polymer and liquid Crystals. Electrical properties such as dielectric response and optical properties were strongly dependent on the concentration of liquid Crystal and correlated with the structure of the System. Electro-optic effect characteristic to these conducting polymer-liquid Crystal Systems and doping effects were also clarified.

Tsunehisa Kimura - One of the best experts on this subject based on the ideXlab platform.

  • Crystal System Determination from X-ray Diffraction of Magnetically Oriented MicroCrystal Suspensions
    Crystal Growth & Design, 2014
    Co-Authors: Kenji Matsumoto, Fumiko Kimura, Guangjie Song, Shuhei Yamane, Hiroaki Kikuchi, Tatsuya Tanaka, Shingo Higuchi, Naoyuki Kitamura, Tsunehisa Kimura
    Abstract:

    A procedure for determining the Crystal System of a microCrystalline powder is described. In this procedure, in situ X-ray diffraction measurements are performed on a microCrystal suspension oriented uniaxially under static and rotating magnetic fields. This is followed by the classification of the obtained diffraction images using a flowchart proposed in this study. To demonstrate the validity of this procedure, diffraction images were recorded for microCrystalline suspensions prepared from known Crystal Systems including triclinic (d-arabitol), monoclinic (cellobiose), orthorhombic (l-alanine), tetragonal (urea), trigonal (bismuth, calcite), hexagonal (zinc), and cubic (sodium chloride) Systems. The Crystals were classified into their respective Crystal Systems following the proposed procedure. The determined Crystal Systems for biaxial Crystals were consistent with the reported Crystal Systems of the microCrystalline powders investigated. Herein, determination of the lattice parameters and space groups...

  • Determination of Crystal System from MicroCrystalline Powder
    Acta Crystallographica Section A Foundations and Advances, 2014
    Co-Authors: Tsunehisa Kimura, Kenji Matsumoto, Fumiko Kimura
    Abstract:

    Determination of lattice constants is a crucial process in analyzing powder diffraction data, affecting the robustness of analyses in subsequent steps. A number of algorithms and software based on them to predict lattice constants from powder data have been reported. In this study, we propose a novel experimental approach to facilitate unambiguous determination of the Crystal Systems and resulting lattice constants from a microCrystalline powder sample. Efforts have been made for partial recovery of Crystal anisotropy from a complete random orientation in powder in order to facilitate the analysis of powder data. Our approach makes use of magnetic orientation[1-3] of microCrystals occurring due to the diamagnetic anisotropy inherent to Crystal. By application of a static/or rotating magnetic field, the easy/or hard magnetization axes of microCrystals undergo uniaxial alignment, giving rise to two different fiber diffraction patterns. These patterns reflect the Crystal symmetry, enabling us to discriminate the Crystal System. Crystals of known Crystal System were pulverized and their suspensions were prepared. Each suspension was subjected to a static/or rotating magnetic field and the X-ray diffraction measurement was performed in situ to obtain two fiber diffraction patterns. It is evident that isotropic Crystals only produce ring patterns for static and rotating measurement. On the other hand, biaxial Crystals exhibit sharp diffraction spots in both fiber patterns. Furthermore, these fiber patterns exhibit layer lines in both patterns for the orthorhombic System, no layer lines for triclinic System, etc. In addition, overlapping of peaks in one-dimensional powder pattern can be resolved by indexing the spots in two dimensions of fiber patterns.

Kenneth D M Harris - One of the best experts on this subject based on the ideXlab platform.

Shahzad Naseem - One of the best experts on this subject based on the ideXlab platform.

  • Development of novel chiral dopants to be used in ferroelectric liquid Crystal System
    Journal of Molecular Liquids, 2013
    Co-Authors: Zohra Nazir Kayani, Robert A. Lewis, Shahzad Naseem
    Abstract:

    Abstract The study of chiral dopant and its application in liquid Crystal System is one of the largest area of research in fluids leading to technological application in the field of display devices. Chiral dopant when mixed with achiral host mixture forms ferroelectric liquid Crystal to be used in surface stabilised liquid Crystal devices. 4-(pentyl, heptyl, nonyl)-2, 3 difluoro terphenyl nitriles and (S)-(−)-1-cyno-2-methylbutyl-4-pentyl-difluoroterphenyl-4′-carboxylate were synthesised and mixed with achiral host mixture HM1 with the percentage of 3 and 7. Ferroelectric properties of synthesised FLC 1 were studied.