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 88, Issue 7
Displaying 1-6 of 6 articles from this issue
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Original Research Paper
  • Novel Environment-friendly Green Pigments for Over-glazed Decoration of Arita Ware
    Toshiyuki MASUI, Atsunori SHIRAISHI, Hiroki NAKADO, Naoki TAKEUCHI, W ...
    2015 Volume 88 Issue 7 Pages 203-207
    Published: July 20, 2015
    Released on J-STAGE: October 20, 2015
    DOIhttps://doi.org/10.4011/shikizai.88.203
    JOURNAL FREE ACCESS
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    Environmental-friendly inorganic green pigments based on (Y0.9R0.1)2BaCuO5 (R = Sm3+, Gd3+, Yb3+, and Lu3+) solid solutions were synthesized and the dopant element was optimized to give the most greenish color. Among the samples, it was found that Lu-doped sample showed brilliant green hue. In response to the results, (Y1−xLux)2BaCuO5 (0 ≤ x ≤ 0.3) pigments were further synthesized and their color properties were characterized in an attempt to find a new environmentally friendly pigment that has more sufficient green chromaticity. Among the samples, the most vivid green hue was obtained for (Y0.9Lu0.1)2BaCuO5 with a greenness value (−a*) of 48.6 in the CIE L*a*b* system, which was significantly larger than those of commercially available Cr2O3 (−a* = 18.2) and CoO∙ZnO (−a* = 25.3) pigments. The Y2BaCuO5 and (Y0.9Lu0.1)2BaCuO5 pigments were used in paints for porcelain. The green colors of the overglazed decoration panels were brilliant. Therefore, these pigments could be the potential candidates for novel green pigments of over-glazed decoration of Arita ware.
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  • Squaraine Dyes with BODIPY Skeletons for the Application to Dye-Sensitized Solar Cells
    Takeshi MAEDA, Daisuke KAKIO, Shigeyuki YAGI, Hiroyuki NAKAZUMI
    2015 Volume 88 Issue 7 Pages 208-217
    Published: July 20, 2015
    Released on J-STAGE: October 20, 2015
    DOIhttps://doi.org/10.4011/shikizai.88.208
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    Novel dyes with hybrid structure consisting of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) and squaraine dye skeletons (SQB-a, SQB-b) were designed in an effort to improve photovoltaic performance of dye-sensitized solar cells in the long wavelength region. These dyes were successfully synthesized through cross-coupling reaction using stannylcyclobutenedione moiety followed by condensation reaction. SQB-a shows absorption band in the visible region (582 nm), whereas SQB-b having electron donating groups on BODIPY component shows two absorption peaks in the longer wavelength region (745 nm, 612 nm). The spectrum shapes of these hybrid dyes are not identical to those of individual components, indicating that BODIPY and squaraine components should electronically interact with each other. SQB-a, SQB-b, and its precursor SSQB-b with squaric acid residue work as sensitizers in dye-sensitized solar cells. Especially, DSSCs based on SQB-b and SSQB-b exhibit spectral response from near-infrared to visible region.
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Review
  • Recent Research Topics of Dye-Sensitized Solar Cells
    Masashi IKEGAMI
    2015 Volume 88 Issue 7 Pages 218-222
    Published: July 20, 2015
    Released on J-STAGE: October 20, 2015
    DOIhttps://doi.org/10.4011/shikizai.88.218
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    Dye-sensitized solar cells are one type of the organic type solar cells and are composed of a photoanode prepared by coating of TiO2 nanoparticle dispersed paste. One of the features of dye-sensitized solar cells is that the electrodes are made by printing processes under ambient conditions. Recently, we have developed a water based binder free high viscous TiO2 paste which realizes good quality TiO2 films by coating and drying only at room temperature. The replacement of conventional organic dyes with organic lead halide perovskite will provide high efficiency light-weight thin organic solar cells by roll-to-roll printing processes.
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  • MAGIQ Process for Making Nanoemulsions Utilizing Unique Properties of Supercritical Water
    Keigo KINOSHITA, Shigeru DEGUCHI
    2015 Volume 88 Issue 7 Pages 223-226
    Published: July 20, 2015
    Released on J-STAGE: October 20, 2015
    DOIhttps://doi.org/10.4011/shikizai.88.223
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    Water at high temperature and high pressure near the gas/liquid critical point (Tc = 374℃, Pc = 22.1 MPa) freely mixes with various oils. We developed a novel emulsification process called MAGIQ (Monodisperse nAnodroplet Generation In Quenched hydrothermal solution), by which nano-sized oil droplets were formed in a bottom-up manner by phase separation of homogeneous solutions of oil in supercritical water in only 10 seconds.
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Serial Lecture
  • Cathodic Protection System and Coating System
    Yoshio SHINODA
    2015 Volume 88 Issue 7 Pages 232-237
    Published: July 20, 2015
    Released on J-STAGE: October 20, 2015
    DOIhttps://doi.org/10.4011/shikizai.88.232
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    Combination of cathodic protection system (CP) and coating system is cost-effective and technically reliable. Even though total areas of coating defects in two cases (with concentrated or distributed defects) are the same, the CP current densities are not the same. Since the concentrated defects cannot be protected with CP easily, some considerations are needed for anodes arrangement. And because the defects may grow on some coating films, it is desirable to use CP with constant potential or current density control. If voltage control unit with smallsized and simple circuit is applied, constant potential control can be done on even a galvanic anode system.
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