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 95, Issue 1
Displaying 1-3 of 3 articles from this issue
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Original Technical Paper
  • Dissociative Azo Dyes for Oxidative Hair Coloring Products and Their Visual Effect
    Takahito NAKAMURA
    2022 Volume 95 Issue 1 Pages 2-8
    Published: January 20, 2022
    Released on J-STAGE: January 28, 2022
    DOIhttps://doi.org/10.4011/shikizai.95.2
    JOURNAL RESTRICTED ACCESS
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    Hair coloring products adopt various type of dyes with different characteristics. The mainly used oxidative dyes show promising basic performance, while typically giving dull color look. Dissociative azo dyes; HC Red 18, HC Blue 18 and HC Yellow 16, which have high chroma, and work in alkaline peroxide system were developed. In addition to the known challenges of the conventional direct dyes, such as dyeing level and skin-staining, stability to the alkaline peroxide was carefully considered. As a result, the dyes can be used in the same way as oxidative dyes, that is, simultaneous bleaching and coloring of the hair. An anionic charge on the hydroxyl group of the dyes can be delocalized onto their conjugated system. The said delocalized charge distribution allowed the dyes to penetrate to the hair cortex and enabled their long-lasting color durability. Cross-sectional observation of the dyed hair showed multi-layered penetration pattern of the dyes in the hair cortex. This penetration pattern provides “Moving Color” effect, which is, angle-dependent hair color look depending on the hair/observer’s position.

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Digest
  • Research and Development of Bioinspired Superhydrophobic Coatings
    Yoshio HOTTA, Yoshihiko MATSUKAWA, Kouji FUJIMOTO
    2022 Volume 95 Issue 1 Pages 9-11
    Published: January 20, 2022
    Released on J-STAGE: January 28, 2022
    DOIhttps://doi.org/10.4011/shikizai.95.9
    JOURNAL RESTRICTED ACCESS
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    We introduce some experimental results and application of our hydrophobic coatings inspired by lotus-leaves and penguin feathers. Samples with various surface roughness were prepared for evaluation of their hydrophobicity. An increase in surface roughness was observed to have a significant effect on contact angle in the region of superhydrophobicity. In Cassie-Baxter state, not only water but also low surface tension liquids can be repelled. This hydrophobic coating technology was applied to films to prevent adhesion of a cake cream. Some material components were arranged to create a durable superhydrophobic structure inspired by penguin feathers. The abrasion resistance of superhydrophobic surfaces can be improved by using a non-woven sheet as base material because of its entangled structure. This result gives us a good hint to establish a durable superhydrophobic surface.

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