Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 83, Issue 12
Displaying 1-5 of 5 articles from this issue
Original Research Paper
  • Shunsuke SUZUKI, Munetoshi SAKAI, Naoya YOSHIDA, Ayako HASHIMOTO, Yosh ...
    2010 Volume 83 Issue 12 Pages 499-504
    Published: December 20, 2010
    Released on J-STAGE: March 20, 2011
    JOURNAL FREE ACCESS
    Smooth fluoroalkylsilane (FAS17) coatings (Ra<0.2 nm) with different surface coverage ratios were prepared on a Si substrate by changing the deposition time. Then the internal fluidity of water droplets sliding on the coatings was evaluated using particle image velocimetry (PIV). The water droplets slid downward with acceleration by a caterpillar-like rotation with slippage on the solid-liquid interface. The sliding acceleration of the advancing contact line decreased concomitantly with the decreasing surface coverage ratio. However, the slipping/rolling ratio to the overall sliding acceleration was almost constant against surface coverage ratio. This result suggests that physical roughness and chemical composition contributed differently to slipping and rolling motions of the droplets.
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Review
Review
  • Hiroshi IRIE, Kazuhito HASHIMOTO
    2010 Volume 83 Issue 12 Pages 511-516
    Published: December 20, 2010
    Released on J-STAGE: March 20, 2011
    JOURNAL FREE ACCESS
    We have designed and fabricated TiO2 photocatalysts sensitive to visible light, after the suggestions made in the literature as to the photo-induced interfacial charge transfer between a semiconductor and an adsorbed molecular species. Among them, Cu (II)/TiO2 decomposed 2-propanol to CO2 via acetone under visible light (>400 nm) with a high quantum efficiency of 8.8%. We speculate that the high performance of the photocatalyst is derived from the photo-produced holes that are generated in the valence band of TiO2 and contribute to the oxidative decomposition of 2-propanol, and the catalytic reduction of oxygen (presumably multi-electron reduction) by photo-produced Cu (I) species on TiO2.
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  • Shin HORIUCHI
    2010 Volume 83 Issue 12 Pages 517-521
    Published: December 20, 2010
    Released on J-STAGE: March 20, 2011
    JOURNAL FREE ACCESS
    Energy-Filtering TEM (EFTEM) was performed for the investigation of polymer interfaces. Polymer-polymer adhesion with various interfacial thicknesses formed between styrene-acrylonitrile random copolymer (SAN) and poly (methyl methacrylate) (PMMA) was studied by oxygen and nitrogen mapping and electron-energy-loss spectroscopy (EELS). Polymer brushes grafted on silica nanoparticles and organic dyes adsorbed on silica nanoparticles have been successfully characterized by high-resolution carbon mapping with contamination-free TEM.
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  • Sliding of a Water Droplet, Removing an Air Layer in Flowing Water
    Munetoshi SAKAI, Akira NAKAJIMA
    2010 Volume 83 Issue 12 Pages 522-529
    Published: December 20, 2010
    Released on J-STAGE: March 20, 2011
    JOURNAL FREE ACCESS
    The evaluation of the surface wettability has been researched from static situation by the contact angle measurement, which bases on Young's equation. Surfaces with a water contact angle greater than 150° (i.e. superhydrophobic surfaces) are currently a subject of great interest and intensive study. This paper reviews the reduction of fluid-flow resistance using the superhydrophobic coating. The latest findings, which are physical model of a sliding water droplet, movement of water droplet in the electric field and retention of air layer in flowing water, are caught quantitatively and visually.
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