Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 52, Issue 1
Displaying 1-4 of 4 articles from this issue
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Original Paper
  • Influence of Anions on the Structure and Morphology of Steel Rust Particles Prepared by Aerial Oxidation of Acidic Fe（II） Solutions
    Hidekazu Tanaka, Nagisa Hatanaka, Miya Muguruma, Ayaka Nishitani, Ta ...
    2015 Volume 52 Issue 1 Pages 4-9
    Published: January 10, 2015
    Released on J-STAGE: January 28, 2015
    DOIhttps://doi.org/10.4164/sptj.52.4
    JOURNAL FREE ACCESS
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    In order to simulate the atmospheric corrosion of steel, artificial steel rust particles were synthesized by aerial oxidation of aqueous solutions containing FeCl2, FeSO4 and NaNO3 and the structure and morphology of the obtained particles were characterized by XRD and TEM. Needle-like SO42- containing Schwertmannite （Fe8O8（OH）6（SO4）） particles were formed in FeCl2-FeSO4, FeSO4-NaNO3, FeCl2-FeSO4-NaNO3 solutions and the crystallization and particle growth of this material were not altered by added Cl- and NO3-. While, the spindle-shaped β-FeOOH particles were formed from in only FeCl3-NaNO3 solution, though no marked change in crystallite and particle sizes of β-FeOOH was recognized by adding NO3-. Accordingly, it can be suggested that the corrosive SOX gas strongly affects on the rust formation in atmospheric corrosion of the steels.
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  • Dry Ultrafine Grinding of Tourmaline Using Grinding Aids of Lower Alcohols
    Mitsumasa Kimata, Tomoaki Ohshima, Naoya Kotake, Masahiro Hasegawa
    2015 Volume 52 Issue 1 Pages 10-16
    Published: January 10, 2015
    Released on J-STAGE: January 28, 2015
    DOIhttps://doi.org/10.4164/sptj.52.10
    JOURNAL FREE ACCESS
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    The effect of lower alcohol aids on the ultrafine grinding of a tourmaline of a silicate mineral was examined by using a vibration ball mill with a laboratory scale. Lower alcohols used were methanol, ethanol and 1-butanol. All of the experiments were carried out by batch operation, and the change of the specific surface area of tourmaline with grinding time was measured by BET adsorption method. The results showed that the lower alcohols were very effective as grinding aid for ultrafine grinding of tourmaline and especially 1-butanol had the aid effect best. Through various measurements the surface of products ground with lower alcohol aids were found to exhibit hydrophobicity due to the chemisorption of alcohol molecules to the surface. The preferred effect of 1-butanol aid is attributed to efficient monolayer adsorption compared with methanol and ethanol of multimolecular layers adsorption.
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Review
  • Preparation of Monodisperse Emulsions in Three-Dimensional Microfluidic Devices Fabricated by Stereolithography
    Masaki Tsuchiya, Toru Katakura, Toshimitsu Kanai
    2015 Volume 52 Issue 1 Pages 17-24
    Published: January 10, 2015
    Released on J-STAGE: January 28, 2015
    DOIhttps://doi.org/10.4164/sptj.52.17
    JOURNAL RESTRICTED ACCESS
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    In this report, we introduce our recent work on fabrication of three-dimensional microfluidic devices by stereolithography. Stereolithography is a method to build a three-dimensional object layer by layer through the photopolymerization of a liquid monomer resin on the basis of computer-aided design （CAD） data. Therefore, design of microfluidic devices with three-dimensional channels can be easily and efficiently performed. We fabricated horizontal- and vertical-type microfluidic devices by stereolithography and performed hydrophilic and hydrophobic surface treatments of the flow channels. We demonstrate that the devices can produce highly monodisperse single and double emulsions. In addition, we show that monodisperse thermosensitive poly（N-isopropylacrylamide） gel particles can be prepared by using monodisperse droplets as templates.
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Fundamentals of Powder Technology, 2nd Edition
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