Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 84 , Issue 9
Showing 1-4 articles out of 4 articles from the selected issue
Original Research Paper
  • Takakazu TAKENOUCHI, Yuta KAWANO, Yasuhiro TAKEUCHI, Yoshiumi KOHNO, K ...
    2011 Volume 84 Issue 9 Pages 308-312
    Published: September 20, 2011
    Released: December 20, 2011
    2-Hydroxy-4'-methoxychalcone (HMC), a synthetic anthocyanin dye, has the same molecular skeleton as plant pigments and is promising as a safe and environmentally friendly photochromic material. With the objective of using the HMC dye under dry conditions, a composite of Al containing mesoporous silica (Al-MPS) and HMC dye was prepared, and its photochromic properties were investigated. The composite of Al-free MPS had a vivid yellow appearance ; the color disappeared within seven days on storage in darkness at 313 K and 95% RH. Its color strength recovered to 50% of the initial value on UV-A irradiation, demonstrating the coloring-discoloring process. Incorporation of Al into MPS increased the quantity of HMC dye adsorbed onto it; however, the discoloring process from the FV+ form (yellow) to the t-C form (non-color) of the dye occurred with some difficulty.
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  • Shigeyoshi MAEDA
    2011 Volume 84 Issue 9 Pages 313-320
    Published: September 20, 2011
    Released: December 20, 2011
    Structural adhesives adopted for replacing spot welding in automotive industry are usually applied to the steel substrates contaminated with various oils such as ship-out oil, stamping or drawing oils. This paper describes the effects of epoxy adhesive composition and surface structure of the oily galvanized steel substrates on the adhesive bonding. Interfacial analysis by XPS and FTIR has disclosed that the preferential adsorption of amino curing agents at the interface plays an important role and that the bond durability of hot-dipped galvanized steel has decreased due to the surface segregation of both lead and aluminum which stimulates intergranular corrosion of zinc during hot water immersion.
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Serial Lecture
Serial Lecture
  • Akihito SAKAI
    2011 Volume 84 Issue 9 Pages 329-334
    Published: September 20, 2011
    Released: December 20, 2011
    A variety of organic UV-absorbers and inorganic UV-shielders are used for sunscreen cosmetics these days. As inorganic UV-shielders, ultra-fine metal oxide powders such as titanium dioxide and zinc oxide are commonly used. Both titanium dioxide and zinc oxide have been manufactured and commercially used for years and have become typical raw materials for sunscreen cosmetics.
    It is widely known that ultra-fine titanium dioxide is used in order to shield UV-B which causes sunburn, while zinc oxide is used to shield UV-A which causes suntan. In the present paper the background to the different usages of the two oxides is explained by considering the difference in their optical properties.
    In addition, the special features and design concept of ultra-fine particles, which differ from pigment products, are explained by describing their basic properties, production process and photo-catalytic activity.
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