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 82, Issue 9
Displaying 1-6 of 6 articles from this issue
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Original Research Paper
  • Surface Treatment of Copper Phthalocyanine Nanoparticles by Forced Thin Film Reactor and Their Dispersion Property
    Daisuke HONDA, Kaeko KOBAYASHI, Yu SUMOTO, Masaki MAEKAWA, Xiaofeng ZH ...
    2009 Volume 82 Issue 9 Pages 381-386
    Published: September 20, 2009
    Released on J-STAGE: December 20, 2009
    DOIhttps://doi.org/10.4011/shikizai.82.381
    JOURNAL FREE ACCESS
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    Nanoparticles of copper phthalocyanine (Cu-Pc) with the size about several-10 nm were fabricated and their surfaces were treated by forced thin film reactor (FTFR). In this method, Cu-Pc nanoparticles were precipitated in water from their solution of fuming sulfuric acid. From the analyses of the surface of the Cu-Pc nanoparticles by IR and XPS, the presence of sulfo group was confirmed. From TOF-SIMS analysis, the presence of sulfonated Cu-Pc was confirmed. It was also confirmed that sulfo group-introduced Cu-Pc nanoparticles on their surface showed excellent dispersibility in the organic solvent. FTFR was found to treat the surface of Cu-Pc nanoparticles uniformly. In order to make the surface of Cu-Pc nanparticles hydrophilic, we used concentrated sulfuric acid instead of fuming sulfuric acid for the surface treatment. When pH of the obtained solution was adjusted to alkaline, the presence of hydroxyl group on the surface of Cu-Pc nanoparticles was suggested by XPS, which resulted in excellent dispersibility in water. It was revealed that Cu-Pc nanoparticles were able to be dispersed in not only organic solvent but also water by processing them in a selected solution in FTFR treatment.
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  • Direct Fabrication of Silica-Coated Gold Nanoparticles and Gold Nanoparticle-Deposited Silica Spheres in Aqueous Media
    Toshio SAKAI, Hiroto ENOMOTO, Hideki SAKAI, Masahiko ABE
    2009 Volume 82 Issue 9 Pages 387-396
    Published: September 20, 2009
    Released on J-STAGE: December 20, 2009
    DOIhttps://doi.org/10.4011/shikizai.82.387
    JOURNAL FREE ACCESS
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    Direct coating of silica on naked-gold nanoparticles (AuNP@SiO2) and direct deposition of naked-gold nanoparticles on silica spheres (SiO2@AuNP) were achieved utilizing 3-mercaptopropyl trimethoxysilane (MPTMS) as in tandem a surface modifier and a silica precursor in an aqueous solution in the absence of any surface pre-treatment of the naked-AuNPs and SiO2 spheres using coupling agents and amphiphiles. The AuNP@SiO2 was prepared with the addition of an ammonia solution prior to a MPTMS aqueous solution into a naked-AuNP dispersion pre-prepared from sonochemical reduction of [AuCl4]− in an aqueous solution. We found that the addition of ammonia prior to MPTMS was critical for proper coating of SiO2 on the naked-AuNPs. Furthermore, the SiO2 shell thickness varied in the range of 40∼170 nm with the content of MPTMS that we applied in this experiment. Base condition (solution pH) was also an important factor for SiO2-coating on the naked-AuNPs. The SiO2@AuNP was formed from sonochemical reduction of [AuCl4]− in a SiO2 sphere dispersion pre-prepared from sol-gel reaction of MPTMS in an aqueous solution.
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Current Topics
Serial Lecture
  • Nano-rheology Measurement
    Shujiro MITANI, Taichi HIRANO, Keiji SAKAI
    2009 Volume 82 Issue 9 Pages 417-423
    Published: September 20, 2009
    Released on J-STAGE: December 20, 2009
    DOIhttps://doi.org/10.4011/shikizai.82.417
    JOURNAL FREE ACCESS
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    The technique with which micro-size or nano-size droplets are manipulated, such as the inkjet printing or the micro-encapsulation, is, recently, in the spotlight, and a new measurement method for the rheological properties of micro droplets is under the necessity of constructing, because the properties of such a small drop can not be measured with the ordinary rheological methods. Approaching the nano-rheology measurement, we report the latest techniques of the rheological measurement for the bulk, the surface and the small droplet of the liquid.
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