Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 88 , Issue 11
Showing 1-5 articles out of 5 articles from the selected issue
Original Research Paper
  • Yi-Hung LIN, Hodaka MURAKAMI, Yoshiumi KOHNO, Masashi SHIBATA
    2015 Volume 88 Issue 11 Pages 371-377
    Published: November 20, 2015
    Released: February 20, 2016
    A method for preparation of a composite comprising an anthocyanidin (aglycone of anthocyanin) dye and HMS-type mesoporous silica under neutral conditions was developed and the colorant properties of the composite as a red pigment were investigated.
    HMS containing a small amount of Al in the synthesis step (Al-HMS) effectively adsorbed anthocyanidin dye to generate a red composite. However, the color of the composite shifted from red to purple as the Al content of Al-HMS increased. This phenomenon was not observed for the composite comprising Al and MCM-41-type mesoporous silica (Al-MCM-41) synthesized under strongly basic conditions. Washing with dilute NaOH(aq) was effective for resolving this issue. Superficial Al species external to the silica framework were removed, and the resulting composite exhibited a vivid red color, even when the Al concentration was high.
    Minimal elution of the dye from the Al-HMS composite was observed in water and the composite exhibited higher photo-stability than the Al-MCM-41 composite.
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    2015 Volume 88 Issue 11 Pages 378-382
    Published: November 20, 2015
    Released: February 20, 2016
    Direct thermal printing is a data recording system based on the thermal reaction of fluoran dyes and color developers. This printing technology is widely used in our daily lives because of its simplicity as well as portable device characteristics. In the coloration process of fluoran dyes, the developers act as a proton donor. They play significant roles in the improvement of the performance of thermal paper, such as sensitivity and image stability. Herein, we present an overview of recent studies which focus on the relationship between molecular structure and the development ability of the developers using single crystal X-ray structure analysis.
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Serial Lecture
  • Katsuaki SAKATA
    2015 Volume 88 Issue 11 Pages 395-400
    Published: November 20, 2015
    Released: February 20, 2016
    Colour, in addition to being a physical feature of objects and an optical feature of light, is a psychological phenomenon called ‘sensation’. Perceived colour often differs from that expected from light physics, which shows that our perceptual mechanisms work in a very intellectual manner rather than simply being mistaken. Instances that are caused in the retinal level, mid-level and higher level of our neurophysiological processes are given in order to show how our colour perception is shaped by our brains complex and plastic mechanisms. These instances, in what is a very advanced field, show us the relationships between the neural mechanism of vision and psychological phenomena of colour.
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