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 81, Issue 9
Displaying 1-6 of 6 articles from this issue
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Original Research Paper
  • Nanoscale Structure Control of Titania/Surfactant Composite Particles Prepared with Catanionic Surfactant Mixtures as Structure Directing Agents
    Hideki SAKAI, Hiroki KOHNO, Hideki HAGIWARA, Taku OGURA, Hirobumi SHIB ...
    2008 Volume 81 Issue 9 Pages 325-330
    Published: September 20, 2008
    Released on J-STAGE: February 06, 2009
    DOIhttps://doi.org/10.4011/shikizai.81.325
    JOURNAL FREE ACCESS
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    Titania/surfactant composite particles with nanoscale ordered structure have been prepared by hydrolysis and condensation reactions of titanium oxysulfate in the presence of molecular assemblies formed at aqueous mixtures of cationic and anionic surfactants as structure-directing agents. When cetyltrimethylammonium bromide (CTAB) and sodium octylsulfate (SOS) were used as cationic and anionic surfactants, respectively, particles with hexagonal type ordered nanostructure were obtained at CTAB-rich compositions and their repetition unit increased with increasing SOS content, while the hexagonal structure changed to lamellar structure at a certain SOS content and the repetition unit decreased above this content. These results showed that precise control of geometry and size of the nanoscale-ordered structure is possible by manipulation of the compositions of cationic CTAB and anionic SOS.
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  • Water/Supercritical CO2 Microemulsions with a Fluorinated Double-tail Surfactant for Syntheses of Semiconductor Ultrafine Particles
    Masanobu SAGISAKA, Masaya HINO, Hideki SAKAI, Masahiko ABE, Atsushi YO ...
    2008 Volume 81 Issue 9 Pages 331-340
    Published: September 20, 2008
    Released on J-STAGE: February 06, 2009
    DOIhttps://doi.org/10.4011/shikizai.81.331
    JOURNAL FREE ACCESS
    Supplementary material
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    A water/supercritical CO2 microemulsion (W/scCO2 μE) with a fluorinated double-tail surfactant bis (1H, 1H, 2H, 2H-heptadecafluorodecyl)-2-sulfosuccinate (8FS(EO)2) was evaluated in terms of its nanoreactor performance for synthesizing semiconductor ultrafine particles of TiO2, ZnS, and CdS. By the addition of tetraisopropylorthotitanate (TIP) in W/scCO2 μE, TiO2 ultrafine particles were successfully synthesized with a spherical shape and sizes of several tens of nanometers, which were similar to those synthesized in W/cyclohexane μE with a typical hydrocarbon double-tail surfactant AOT. Interestingly, in contrast to the μE system, TiO2 particle syntheses in liquid-crystal-like (LC-like) surfactant precipitant phase yielded a dendritical morphology of TiO2. For metal sulfide synthesis, the addition of metal nitrates as precursors in W/scCO2 μE was found to lower the maximum W0 value at which W/scCO2 μE can form, which would result from the promoted aggregation and fusion between reverse micelles, i.e., LC formation. After mixing both the W/scCO2 μEs containing metal nitrate and Na2S, metal sulfide ultrafine particles were yielded with spherical shape and sizes of several tens of nanometers. These results suggested that W/scCO2 μE with 8FS(EO)2 may become a valuable nanoreactor when further investigations reveal size-control techniques for the products.
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