Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 85 , Issue 5
Showing 1-6 articles out of 6 articles from the selected issue
Original Research Paper
  • Masaki MAEKAWA, Daisuke HONDA, Masakazu ENOMURA, Hideki SAKAI, Masahik ...
    2012 Volume 85 Issue 5 Pages 185-190
    Published: May 20, 2012
    Released: August 20, 2012
    JOURNALS FREE ACCESS
    Phthalocyanine solid solution nanoparticles consisting of brominated chlorinated zinc phthalocyanine (Zn-Pc) and copper phthalocyanine (Cu-Pc) were fabricated using the forced thin film reactor (FTFR). In this method, the phthalocyanine nanoparticles were crystallized by mixing water with phthalocyanine solution, which was made from dissolving Cu-Pc and Zn-Pc (Cu : Zn = 3.8 : 6.2, 5.8 : 4.2, and 7.6 : 2.4 molar ratio) in fuming sulfuric acid. The analysis results of the fabricated phthalocyanine nanoparticles by X-ray diffraction (XRD), infrared spectroscopy (IR), inductively coupled plasma spectroscopy (ICP) and scanning transmission electron microscopy-energy dispersive spectroscopy (STEM-EDS) showed phthalocyanine solid solution nanoparticles with a uniform distribution of Cu and Zn. Moreover the diameters of the phthalocyanine particles were 10 ~ 30 nm. From the result of the dispersion analysis of the phthalocyanine nanoparticles using utra-violet and visible spectrophotometry (UV-Vis) in a visible region, it was confirmed that the transmission regions of the phthalocyanine nanoparticles were controllable by the molar ratio of Cu and Zn. From the result of the thermal characteristic by thermogravimetry-differential thermal analysis (TG-DTA), it was confirmed that the decomposition temperatures of the phthalocyanine nanoparticles were higher than those of the raw materials. It was found possible to fabricate phthalocyanine solid solution nanoparticles with novel characteristics using the FTFR.
    Fig. 7 STEM-EDS analysis of nano pigment particle manufactured by FTFR under No.2 condition [(a) STEM image *red square displays mapping area (b) HRTEM image (c) Br mapping image (d) Cu mapping image (e) Zn mapping image (f) EDS chart].
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Note
Digest
  • Masahiko ISHII
    2012 Volume 85 Issue 5 Pages 196-200
    Published: May 20, 2012
    Released: August 20, 2012
    JOURNALS RESTRICTED ACCESS
    Polymer-immobilized colloidal crystal films have been fabricated by conventional spray coating of silica-acrylic monomer suspensions followed by UV curing. Controlling both the viscosity of the suspensions and the wettability of substrates enabled the synthesis of colloidal crystal films with smooth surfaces and brilliant structural colors due to Bragg diffraction. The structural colors could be controlled by particle concentrations as well as particle diameter. The wettability influenced the thickness of the coated film and it consequently affected the Bragg reflection intensity of the film. By the use of this effect, shapes were textured on a substrate having regions with different wettabilities by using a single spray coating.
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Serial Lecture
Serial Lecture
  • Eiji KAWAMURA, Hiroshi IWASAKI
    2012 Volume 85 Issue 5 Pages 208-214
    Published: May 20, 2012
    Released: August 20, 2012
    JOURNALS RESTRICTED ACCESS
    Security products such as banknote have a high risk of being counterfeited. In order for people to deter counterfeiting, security features must progress itself as counterfeit technologies change with the times. Especially, recent digital technologies allow anyone to counterfeit easily without any special skill. It becomes a new era that everyone is able to make a certain level of counterfeits and forgeries in house. This report briefly explains the outline of the latest security features which have been introduced mainly in the field of banknotes and passports.
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Serial Lecture
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