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 85, Issue 6
Displaying 1-6 of 6 articles from this issue
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Original Research Paper
  • Fabrication of Silver-Copper composition Nanoparticles by Forced Thin Film Reactor
    Masaki MAEKAWA, Daisuke HONDA, Masakazu ENOMURA, Hideki SAKAI, Masahik ...
    2012 Volume 85 Issue 6 Pages 229-234
    Published: June 20, 2012
    Released on J-STAGE: September 20, 2012
    DOIhttps://doi.org/10.4011/shikizai.85.229
    JOURNAL FREE ACCESS
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    In this paper, we report a preparation of Silver (Ag)-Copper (Cu) composition metal nano particles by Forced Thin Film Reactor(FTFR). With FTFR, particles were able to prepared by liquid phase coreduction of silver nitrate and copper nitrate with hydrazine. In which silver nitrate and copper nitrate [Ag(NO3) and Cu(NO3)2·3H2O in ethylene glycol, Ag : Cu = 85 : 15, 70 : 30, 50 : 50 (mol% respectively)] were solved with ethylene glycol, and the reductant solution were prepared by mixing of hydrazine monohydrate as a reduction reagent, potassium hydroxide (KOH) as a pH adjusting reagent and polyvinylpyrrolidone (M = 40,000) as a protective reagent for the Ag-Cu composition metal nano particles.
    Ag-Cu composition metal nano particles were characterized by transmission electron microscopy-energy dispersive spectroscopy (TEM-EDS), scanning transmission electron microscopy-energy dispersive spectroscopy (STEM-EDS), X-ray diffraction (XRD), inductively coupled plasma spectroscopy (ICP) and differential scanning calorimetry (DSC). These results showed that Ag-Cu composition metal nano particles manufactured by FTFR(about 10 ~ 20 nm) consist with composition of Ag : Cu (mol%) in accordance with experimental conditions.
    Fig. 4 HAADF images and STEM mappings of AgCu nano particles manufactured by FTFR under EX.1 and EX.2 condition with results of quantitative analysis by STEM-EDS [Blue letter indicates a result of quantitative analysis at blue square area. White letters indicate results of quantitative analysis for whole mapping areas.].
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  • Non-destructive Evaluation of Deteriorated Organic Coated Steels Using Surface Potential Measurement
    Hideki KATAYAMA, Kengo SEKI, Isao SHITANDA, Masayuki ITAGAKI, Hiroyuki ...
    2012 Volume 85 Issue 6 Pages 235-239
    Published: June 20, 2012
    Released on J-STAGE: September 20, 2012
    DOIhttps://doi.org/10.4011/shikizai.85.235
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    Degradation of organic coated steels has been evaluated by a surface potential measurement which can map electrochemical potential distributions without contact to the specimens. Surface potential measurement of a model specimen to simulate corrosion under an organic coating detected almost the same deteriorated area as the actual defect. A wet and dry cyclic corrosion test under a small droplet of 0.5M NaCl solution was conducted in order to follow the degradation of organic coated steels. The surface potential profile changed after 3 cycles of the corrosion test. The deteriorated area of coating grew with an increase of wet-dry cycles and had expanded to the initial size of the droplet of NaCl solution after 10 cycles of the corrosion test. The surface potential measurement can be a valuable tool for the non-destructive estimation of the degradation of organic coated steels.
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Review
  • Corrosion Protection of Metals by Conductive Polymer Polyaniline
    Shigeyoshi MAEDA
    2012 Volume 85 Issue 6 Pages 240-248
    Published: June 20, 2012
    Released on J-STAGE: September 20, 2012
    DOIhttps://doi.org/10.4011/shikizai.85.240
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    Conductive polymer polyaniline has been shown to have corrosion protection effect for ferrous and non ferrous metals. Polyaniline has the characteristics of easy synthesis, excellent environmentally stability and low cost. Corrosion protection mechanism of polyaniline on steel is based on the formation of thin protective oxide layer due to electrochemical reaction between the polymer and iron surface. Scanning Vibrating Electrode Technique (SVET) showed that the polyaniline coating exhibited a “self healing” at coating defects. Polyaniline is used either as primer or as anti-corrosive pigment for conventional coatings such as epoxy, acrylic, etc. NASA has adopted polyaniline containing coating for the corrosion protection of Space Shuttle Launcher at Kennedy Space Center in Florida.
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Serial Lecture
  • Rheological Analysis of Dispersed Fine Particles Suspensions and their Applications for Cosmetics
    Akio NASU
    2012 Volume 85 Issue 6 Pages 249-253
    Published: June 20, 2012
    Released on J-STAGE: September 20, 2012
    DOIhttps://doi.org/10.4011/shikizai.85.249
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    Analysis of particle dispersions has historically only used qualitative methods based on individual experiences and senses so it has not been possible up to now to establish an evaluation system for dispersion technology. However, the demand for ultra-fine particles as scattering agents for ultra-violet rays has recently increased and the development of a technique for dispersing fine flocculated particles and a method for accurate evaluation of the dispersing condition has become necessary. Technologies based on rheological analysis have recently been developed to clarify particle flocculation and structure in suspensions of dispersed fine particles. Furthermore, it is known that rheological parameters are correlated with the capacity to counter ultraviolet rays.
    In this review, the methods for analysis of fine particle dispersions are introduced mainly on the results of actual research. Moreover, some examples of applications for cosmetic formulations are shown.
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Serial Lecture
Serial Lecture
  • Electrodeposition Coating for Aluminum Structural Materials
    Koji HIRANO, Yoshitaka MIZOGUCHI
    2012 Volume 85 Issue 6 Pages 259-264
    Published: June 20, 2012
    Released on J-STAGE: September 20, 2012
    DOIhttps://doi.org/10.4011/shikizai.85.259
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    Most of aluminum structural materials in Japan are prepared by anodizing of aluminum to form thin oxide films on the surfaces, followed by surface finishing by electrodeposition. This method, developed in the 1960s in Japan, was suitable for warm and humid environment, and dramatically has spread in Japan. This article provides a manufacturing process of the multiple coating films, a plant of electrostatic painting, and the change and improvement of electrodeposition coating.
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