Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 83, Issue 3
Displaying 1-6 of 6 articles from this issue
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Original Research Paper
  • Stabilization of Flavylium Dye by Incorporation into Bentonite Clay
    Yoshiumi KOHNO, Ryo HOSHINO, Shuji IKOMA, Masashi SHIBATA, Ryoka MATSU ...
    2010Volume 83Issue 3 Pages 103-107
    Published: March 15, 2010
    Released on J-STAGE: June 20, 2010
    DOIhttps://doi.org/10.4011/shikizai.83.103
    JOURNAL FREE ACCESS
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    We have enhanced the stability of a flavylium dye, a model compound of a natural anthocyanin dye, by the incorporation into the interlayer of a natural clay, bentonite. The composite of the flavylium and the bentonite shows excellent stability under increased temperature (up to 353 K) or alkaline environment (pH∼9) compared to the original flavylium dyes. This material can be candidate of an environmentally friendly coloring material. Increased amount of dye causes a muddy color due to the formation of dye aggregate. Samples with brilliant color can be obtained with the loading amount less than 0.25 mmol dye per g-clay.
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Integrated Paper
Current Topics
  • Perovskite-type (La,Sr) TiO2N Oxynitrides Showing Rainbow Color Changing in Accordance with the Composition
    Toshihiro MORIGA
    2010Volume 83Issue 3 Pages 115-120
    Published: March 15, 2010
    Released on J-STAGE: June 20, 2010
    DOIhttps://doi.org/10.4011/shikizai.83.115
    JOURNAL FREE ACCESS
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    We have prepared oxynitride pigments showing various colors by tuning the O/N, Ti/La and Sr/La ratios independently in the perovskite-type (La,Sr) TiO2N. The increase in O/N ratio led to enhancement of bandgap energy, that is, blueshift of the absorption edge, resulting in the color change from reddish orange to white through yellow. The increase in Ti/La ratio lowered the reflectivity in the longer wavelength region after the absorption edge. The substitution of La by Sr improved the reflectivity in the longer wavelength region. Especially, in cation-nonstoichiometric oxynitrides with Ti/(La+Sr) > 1, the Sr-substitution enhanced the reflectivity in the region just after the absorption edge and efficiently reduced the reflectivity in the red region, probably due to the formation of a lot of anion deficiency. These features have enabled us to produce La-Sr-Ti-O-N oxynitride pigments showing the three primary colors composed of nontoxic and ecological elements.
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Digest
  • Hierarchical Microphase-Separated Structures Formed by 3-component Star-Shaped Terpolymers
    Atsushi TAKANO
    2010Volume 83Issue 3 Pages 121-128
    Published: March 15, 2010
    Released on J-STAGE: June 20, 2010
    DOIhttps://doi.org/10.4011/shikizai.83.121
    JOURNAL FREE ACCESS
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    It is well-known that block copolymers form regular self-assembled structure, so-called “microphase-separated structures” in bulk. Among the block copolymers, ABC star-shaped terpolymers form characteristic microphase-separated structures, because microphase separation from the three component polymers in the ABC star requires a one-dimensional spatial arrangement of the connecting points, therefore, the terpolymer in microphase-separated structure must be highly frustrated. In this review, we show several tiling cylindrical microphase-separated structures, double periodic structures, and network structures, formed by the ABC star-shaped terpolymers were reported.
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Review
  • Molecular Switches Based on Spironaphthoxazine
    Sung-Hoon KIM
    2010Volume 83Issue 3 Pages 129-138
    Published: March 15, 2010
    Released on J-STAGE: June 20, 2010
    DOIhttps://doi.org/10.4011/shikizai.83.129
    JOURNAL FREE ACCESS
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    Spironaphthoxazines (SPO) are well-known photochromic compounds of interest from the viewpoint of fundamental elucidation of photochemical switches and potential applications in optical memories. This paper reports on the conductivity switches, viscosity switches, fluorescence switches and gel switches of SPO. In addition, bistable photoswitching in poly (N-isopropylacrylamide) with SPO hydrogel for optical data storage is described.
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Serial Lecture
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