Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 86, Issue 6
Displaying 1-7 of 7 articles from this issue
Special Edition New Worlds From Functional Colorants
Review
  • Hiroyuki NAKAZUMI
    2013 Volume 86 Issue 6 Pages 190-197
    Published: June 20, 2013
    Released on J-STAGE: September 20, 2013
    JOURNAL FREE ACCESS
    Many functional dyes and pigments are widely applied in various displays, such as liquid crystal displays (LCD), plasma display panels,organic light emitting displays (OLED), optical data storage systems, digital printing systems, and dye-sensitized solar cells. In this outline of functional colorants, the functional dyes and pigments that are mainly used in displays and printing systems are illustrated. For example,organic pigments used for the color filter of LCD need to be present as fine particles to get high transparency and color ratio are taken from the high-performance pigments, such as diarylides, quinacridones and phthalocyanines, whereas dichromic dyes used in high-performance polarizing filters are taken from dis- or trisazo dyes. Some fluorescent dyes and cyclometalated iridium complexes are introduced as fluorescent and phosphorescent materials in OLED to give typical blue, green and red light sources.
    In the field of ink-jet technology which is now widely used in all areas, some nano-pigments with a binder or a post-UV cured resin binder give much improved color space and brightness approaching dye-based inks. It is also explained that the color-formation and color-fading reactions in thermo-sensitive recording paper in which contains a fluoran leuco dye and an acidic compound with a long chain alkyl group are reversible.
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  • Takamasa TSUKAMOTO, Tetsuya SHIMADA, Shinsuke TAKAGI
    2013 Volume 86 Issue 6 Pages 198-203
    Published: June 20, 2013
    Released on J-STAGE: September 20, 2013
    JOURNAL FREE ACCESS
    We have been investigating complexes composed of nanolayered materials with anionic charges such as clay nanosheets and dye molecules such as cationic porphyrins. It was found that the structure of dye assembly on the layered materials can be effectively controlled by the use of electrostatic host-guest interaction. The mechanism to control these structural factors has been discussed and was established as a sizematching effect. Unique photochemical reactions such as energy transfer through the use of this methodology have been examined. Control of the molecular orientation angle is found to be useful in regulating the energy-transfer efficiency and in preparing photofunctional materials exhibiting solvatochromic behavior.
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Review
  • Katsuhiko KANAIZUKA, Manabu ISHIZAKI, Masato KURIHARA
    2013 Volume 86 Issue 6 Pages 204-211
    Published: June 20, 2013
    Released on J-STAGE: September 20, 2013
    JOURNAL FREE ACCESS
    We have developed high-performance functional materials on the basis of coordination chemistry and nanoscience. Due to their increased specific surface areas nanoparticles (NPs) show fascinating properties not seen with their bulk forms. Using the specific surface activity of NPs, novel functionalities have been discovered. In this report, we have focused on surface-modification and surface-nanoarchitecture of Prussian blue (PB) and its analog NPs, printed-electronics electrodes made of Ag NPs via the drastic melting-drop phenomenon, and efficient photoelectric conversion systems using the plasmon effect of Ag NPs. We succeeded in color-tuning of dispersion solutions of the PB NPs, in a simple, high-yield, low-cost, environmentally friendly, and large-scale synthesis of Ag NPs, and in fabrication of the plasmon-enhanced photoelectron-generation systems due to optimized combination between colored Ag NPs and organic dyes.
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  • Mareki OHTSUJI, Moeko AIDA
    2013 Volume 86 Issue 6 Pages 212-216
    Published: June 20, 2013
    Released on J-STAGE: September 20, 2013
    JOURNAL FREE ACCESS
    The aim of tissue staining is to make cells and tissue structures observable, using the binding capacity and permeability of the dye. The hematoxylin and eosin staining method developed by Busch in 1878 combined, hematoxylin, the natural dye and eosin, the chemical dye. Papanicolaou (Pap) staining, introduced in 1942, is a method employing the diffusion permeability of the dyes involved. These staining methods are the gold standard for diagnosis in human histology and cytology.
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Digest
  • Yuya HASUNUMA, Akira OCHIAI
    2013 Volume 86 Issue 6 Pages 217-224
    Published: June 20, 2013
    Released on J-STAGE: September 20, 2013
    JOURNAL FREE ACCESS
    The clinical microbiology tests are basic examinations for identification of causal agents in the bacterial infection. These tests require us to check the “colors” in the examination. The staining methods include the Gram's stain, Ziehl - Neelsen stain, and lactophenol cotton blue stain. The color changes in the isolation and identification agars are brought by utilization of glucose and pH indicator. Bacteria often produce various pigments in the clinical microbiology testing. Microbiologists utilize these “colors” as a clue to identify the bacteria. In this review, we describe the chemical and biological characteristics for producing “colors” in the clinical microbiology tests.
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Serial Lecture
  • Tatsuya TANAKA
    2013 Volume 86 Issue 6 Pages 231-236
    Published: June 20, 2013
    Released on J-STAGE: September 20, 2013
    JOURNAL FREE ACCESS
    In recent years the use of thermoplastic resin composites strengthened not only by spun glass or carbon fiber but also by natural fiber has been increasing. Unlike the case of thermosetting resins, the molding method has shifted towards mechanization and the target industrial field has also been changing to mass production parts.
    On the other hand, although mechanical properties improve due to the increase in aspect ratio, becoming maximized when a continuous fiber is used, the flexibility of the mold falls. However it is not the aspect ratio but the distribution of fiber that is important, with the fiber distribution especially influencing the surface quality of the product and the deviation of mechanical properties.
    Accordingly the accomplishment of uniform distribution of a fiber regardless of its aspect ratio is a key issue which should be solved for products to be used for long periods of time.
    For thermoplastic composite materials based on distributed fiber, this paper shows that the use of a long residual fiber and high fiber distribution can be compatible by optimizing the screw configuration of the injection molding machine.
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