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 87, Issue 7
Displaying 1-5 of 5 articles from this issue
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Integrated Paper
  • Recent Studies on Heteropolyacid (HPA)/TiO2 Hybrid Photocatalysts
    Kunchaya PRUETHIARENUN, Akira NAKAJIMA
    2014 Volume 87 Issue 7 Pages 227-234
    Published: July 20, 2014
    Released on J-STAGE: October 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.87.227
    JOURNAL FREE ACCESS
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    Titanium dioxide (TiO2) is an excellent photocatalyst for water and air purification. Because of the strong oxidation power of photogenerated holes from TiO2, it can decompose almost all organic compounds. However, some limitations of its quantum yields remain because of its poor charge separation efficiency and its low Fermi level for O2 reductions. Heteropolyacids (HPAs) are a subclass in a family of polyoxometalates (POMs), which are clusters of metal oxides that have a well-defined structure. Materials of this group enhance the photocatalytic activity of TiO2 by a Z-scheme. Initially, the HPA(aq)/TiO2(s) system was mainly studied. Recently however, transparent thin films of these hybrid materials have been prepared. Their unique properties such as excellent retention of the hydrophilicity after stopping UV illumination were reported. Herein, we review several recent studies that have examined these hybrid materials as photocatalysts.
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Current Topics
  • Utilization of Inorganic Nanoparticles and Interfaces for Controlling Cell Functions
    Motohiro TAGAYA
    2014 Volume 87 Issue 7 Pages 235-239
    Published: July 20, 2014
    Released on J-STAGE: October 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.87.235
    JOURNAL FREE ACCESS
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    In Japan, an unparalleled aging of society is proceeding. Thus, the development of a society in which all people can live a healthy and vigorous life is becoming imperative. In the biomedical field involving nanotechnology (e.g., nanoparticle therapeutics), nanoparticles that effectively work on and promote cell functions will provide novel concepts for tissue engineering and drug therapy to treat human diseases. In this review article, research on the control of cell functions using inorganic nanoparticles is introduced. Particular attention is paid to the control by biocompatible hydroxyapatite nanocrystal-cell interfacial interactions on a solid substrate, and the preparation of silica nanoparticles for cellular uptake through the cell membranes is also discussed. Furthermore, the nanoparticles used as the starting point for nanobiotechnology are overviewed, leading to design new nanobiomaterials for next-generation medical techniques.
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  • Evaluation Techniques for Dispersion Stability of Slurry
    Hiroshi SATONE
    2014 Volume 87 Issue 7 Pages 240-244
    Published: July 20, 2014
    Released on J-STAGE: October 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.87.240
    JOURNAL FREE ACCESS
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    It is very important to control the particle dispersion state of slurries in order to fabricate better products in wet shaping processes. Therefore it is very important to evaluate slurry characteristics to predict the product characteristics. As a result, many studies have evaluated the slurry characteristics in various ways, such as measuring apparent viscosities, gravitational settling etc. However, it has been reported that these evaluation methods do not always have a good relationship with the quality of the final products. It is thought that one of the reasons for this is the fact that the method used was inappropriate for the actual situation. Several methods useful for the material fabrication process, such as measuring apparent viscosities and gravitational settling, are explained in this paper. Furthermore, an evaluation method proposed by our group to predict in a short time the packing characteristics of a slurry by measuring the hydrostatic pressure of the slurry at the base of a settling tube is also explained.
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Serial Lecture
  • Recent Trends of Dismantlable Adhesives
    Chiaki SATO
    2014 Volume 87 Issue 7 Pages 245-249
    Published: July 20, 2014
    Released on J-STAGE: October 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.87.245
    JOURNAL FREE ACCESS
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    Recent trends in dismantlable adhesives, which can be separated on demand, are discussed in this article. This type of adhesive is convenient and useful for recycling of adhesively bonded materials, setting work and reworking of parts. Most take advantage of the melting of thermoplastic resins. Use of thermally expandable agents is also applied to this type of adhesive. Adhesives based on new types of separation mechanisms have been proposed. For instance, electrically disbonding adhesives are now commercially available.
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