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 86, Issue 10
Displaying 1-5 of 5 articles from this issue
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Original Research Paper
  • Formation of Gold Nanorod Dimers and their Activity for Surface-Enhanced Raman Scattering
    Shuichiro HAKODA, Mikiko KISU, Kanjiro TORIGOE, Takeshi ENDO, Kenichi ...
    2013 Volume 86 Issue 10 Pages 365-370
    Published: October 20, 2013
    Released on J-STAGE: January 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.86.365
    JOURNAL FREE ACCESS
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    Side-by-side connected gold nanorod dimers were formed by ligand substitution of hexadecyltrimethylammonium bromide (C16TAB) bilayer with 1-hexylamine. The addition of 1-hexylamine caused a gradual aggregation of gold nanorods, which was verified from blue shift of the longitudinal localized surface plasmon resonance (LSPR) band of gold nanorods. Dimers were found to be preponderant at about 4 h from the addition of 1-hexylamine. Raman intensity of Rhodamine 6G (R6G) molecules in the presence of gold nanorod dimers exhibited a 50-fold and a 15-fold enhancement compared with that of aqueous R6G solution without gold nanorods and with gold nanorod monomers, respectively.
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Review
  • Mixing Enhancement Effect of Low-Molecular-Weight Gelators
    Yutaka OHSEDO, Hisayuki WATANABE
    2013 Volume 86 Issue 10 Pages 375-379
    Published: October 20, 2013
    Released on J-STAGE: January 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.86.375
    JOURNAL FREE ACCESS
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    Recently, we found that alkylhydrazide derivatives, which are commercially available and low cost reagents, formed organogels in various organic solvents having dielectric constants ranging from 2 to 66. We also found that organogels comprised of mixed alkylhydrazide derivatives with different alkyl chain lengths as low-molecular-weight organogelators showed thixotropic behaviors, whereas organogels comprised of a single alkylhydrazide derivative did not show such behaviors. The transparency and mechanical properties of the mixed organogels were enhanced. This mixing enhancement for organogelators might be attributed to an improved network of closer and finer fibers as compared with that in a one-component system.
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Serial Lecture
  • Molecular Dynamics Simulation
    Hiroyuki SHINTO
    2013 Volume 86 Issue 10 Pages 380-385
    Published: October 20, 2013
    Released on J-STAGE: January 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.86.380
    JOURNAL FREE ACCESS
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    The present tutorial paper briefly explains the fundamentals of molecular dynamics simulation, that is, the equations of motion and the molecular models. Two types of the molecular models are introduced : “atomistic model” and “coarse-grained model”. The former represents real molecular systems faithfully, whereas the latter represents water/oil/surfactant systems quite simply with focusing on the most essential characteristics, hydorophilicity and hydorophobicity. The molecular dynamics studies of interfacial microstructures and surface forces are briefly introduced. As for water in the vicinity of hydrophilic and hydrophobic solid surfaces, the results from the atomistic model simulations are compared with those from the coarse-grained model simulations. The more practical applications of the coarse-grained model are also explained, where the interaction forces between the hydrophilic colloids in alcohol solutions are studied.
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  • Secondary Ion Mass Spectrometry
    －Time of Flight Secondary Ion Mass Spectrometry－
    Shuji ISHIKAWA, Yuko TAKEGUCHI
    2013 Volume 86 Issue 10 Pages 386-391
    Published: October 20, 2013
    Released on J-STAGE: January 20, 2014
    DOIhttps://doi.org/10.4011/shikizai.86.386
    JOURNAL FREE ACCESS
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    SIMS is a type of mass spectrometry that uses a secondary ion which has been generated from a sample surface by a primary ion beam. Compared with D-SIMS, measurement of an insulator is easy for TOF-SIMS which uses a lower amount of ion irradiation and is able to ionize organic compounds without causing significant changes in their chemical structure.
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