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 45, Issue 3
Displaying 1-15 of 15 articles from this issue
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  • Array Structure and Self-organization in Assembly of Fine Particles
    Explore Future Possibilities as a Bottom-up Technology
    Hiroshi Fudouzi
    2008 Volume 45 Issue 3 Pages 143
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.143
    JOURNAL FREE ACCESS
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  • Polymer Colloidal Crystals for Laser Applications
    Seiichi Furumi
    2008 Volume 45 Issue 3 Pages 144-148
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.144
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    The monodispersed microparticles have an intrinsic capability to self-assemble the face-centered cubic lattice structures on the substrate from the suspension media. The highly ordered 3-D architectures of colloidal particles are called colloidal crystals (CCs). The CC structures have received tremendous interest as one of the alternative and facile fabrication techniques of the 3-D photonic crystal structures. Significant progress has established not only various fabrication techniques for high-quality CCs, but also their versatile applications to optical sensors with external stimuli. In this report, we have developed a novel potential utility of CCs for the flexible polymer lasers by low-threshold optical excitation. The laser cavity structure consists of an intermediate light-emitting layer containing fluorescent dye sandwiched between a pair of polymeric CC films. The optical excitation of the device gave rise to the laser oscillation within the photonic band-gap of the CC films. Interestingly, the laser action could be generated by optical excitation even though the CC laser device of all polymer materials are bent in shape by mechanical stress.
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  • Determination of Critical Particle Concentration for Colloidal Crystallization with Small Amount of Sample
    Toshimitsu Kanai, Tsutomu Sawada
    2008 Volume 45 Issue 3 Pages 149-155
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.149
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    We report that the critical particle concentration for colloidal crystallization can be determined with an extremely small amount of sample on the basis of the unique properties of the colloidal system. A large concentration gradient including a crystalline-noncrystalline phase boundary was temporarily generated by centrifuging the suspension. In the recovering process after the centrifugation, the particle concentration of the crystalline phase at the boundary was found to always have the equilibrium value, although the global concentration distribution evolved with time. The present method requires only one batch of a suspension in the order of microliters and is applicable up to high concentration regions near the closest packing without the effect of the particle aggregation.
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  • DNA Mediated Sequential Self-assembly of Au Nano-particles
    Tatsuya Kusakabe, Tomoki Tanemura, Yuichi Higuchi, Koji Sugano, Toshiy ...
    2008 Volume 45 Issue 3 Pages 156-161
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.156
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    The novel sequential self-assembly process applying hybridization of DNA mediated micro/nano components was proposed and its validity was experimentally verified. In the proposed process, characteristic of DNA, such as hybridization specificity of complementary pairs of single-stranded DNA (ssDNA) into a double-stranded DNA (dsDNA), and its dependence on melting temperature Tm, which can be designed by the base-pair sequence and salt-concentration of surrounding media, was utilized to control the self-assembly sequence of a micro/nano components modified by ssDNA. Au nanoparticles with 15nm diameter were used as components and two pairs complementary DNA with different Tm were prepared. The aggregation of Au nano-particles modified by complementary ssDNA was confirmed at different temperatures with decreasing temperature under Tm. The reversibility of this process was also confirmed by increasing temperature.
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  • Pyramidal Self-assembly Arrays of SiO2 Particles Using Top-gathering Pillars
    Hiroyo Segawa, Yasuo Yamazaki, Tetsuji Yano, Shuichi Shibata
    2008 Volume 45 Issue 3 Pages 162-167
    Published: March 10, 2008
    Released on J-STAGE: July 01, 2010
    DOIhttps://doi.org/10.4164/sptj.45.162
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    Three-dimensional periodic pyramidal assemblies of SiO2 particles with 500nm diameter have been fabricated using top-gathering pillar arrays as a new template. Top-gathering pillar arrays, in which four pillars gathered at the top and arranged periodically, were fabricated by photolithography of an organicinorganic hybrid material. The top-gathering units were obtained by the control of capillary force and restoring force. After colloidal suspension was dropped on the template, the SiO2 particles were moulded in the pyramidal spaces under the top-gathering pillars and the assembly arrays of the particles were obtained.
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  • Fabrication of Two-Dimensional Particle Aggregate under Mechanical Loading
    Hiroyuki Muto, Koji Kimata, Yusuke Daiko, Atsunori Matsuda, Mototsugu ...
    2008 Volume 45 Issue 3 Pages 168-172
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.168
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    The microscopic processes and mechanisms were examined for the formation of two-dimensional close-packed arrays of SiO2-microparticles in its colloidal suspension. An experimental device was designed to make two-dimensional arrays of colloidal particles by sandwiching the particles under various compressive loads between two of solid bars. It was found that a specific loading configuration yielded the most sufficient result for successfully forming a closest packed array over its large area. The experimental technique proposed in this study provides an efficient tool for eliminating several types of defects, i. e., line and point defects, undesirably induced and included in the processes for forming particulate aggregates with close-packed structures.
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  • Particle Growth and Self-assembling Ordered Arrays of Dodecanethiol-protected Gold Nanoparticles during Heat Treatment on Glass Substrates
    Masahiro Shishido, Chiaki Yoshida, Naoki Miyashima
    2008 Volume 45 Issue 3 Pages 173-179
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.173
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    Particle growth and ordered array formation of thiol-protected gold nanoparticles by a heat treatment of mono-layered particle film on a glass substrate were experimentally examined. It was found that both increase in size of particles and formation of ordered particle arrays took place simultaneously during the heat treatment. The hydrophilicity of the substrate was found to strongly affect the particle growth and the formation of ordered particle arrays during the heat treatment. While well-ordered particle arrays were formed on hydrophobic surfaces, aggregating colony-like structure were formed on hydrophilic surfaces. Particle growth continued during the heat treatment and finally a thin gold film could be produced. Thus, the particle growth was most likely caused by the collisions among particles due to Brownian motion. It could be considered that the particle size after the heat treatment could be determined by the rate of coalescence of particles.
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  • Reproduction of Morpho Butterfly's Blue and its Optimization of Characteristics
    Yoko Ishikawa, Yusuke Miyamura, Megumi Akai-Kasaya, Yuji Kuwahara, Aki ...
    2008 Volume 45 Issue 3 Pages 180-186
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.180
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    Morpho-butterfly's brilliant blue is produced from the scale. It contains no blue pigment, but has high reflectivity of the blue coloration, thus the origin of the coloration should be due to the microscopic structure. However, it appears not multi-coloration but blue from excessively wide angle, which contradicts the interference obviously. Recently, the mystery has been explained with a principle given by a peculiar nano-structure. We experimentally proved the principle by fabricating the optical film by controlling the parameters in nanoscale. The artificial film reproduced the basic characteristics of the Morpho-blue, however in detail, showed some differences from the Morpho-butterfly. In order to make it closer to the Morpho-butterfly than the prototype, we attempted to optimize the film by controlling parameters through the consideration of optical simulations and micro-structural observations. By comparing a series of films systematically, the relationship between the parameters and the properties was analyzed, and the optimized parameters were successfully determined.
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  • Report of the 43rd Summer Symposium
    Self-assembly and Array Structure of Fine Particles: Exploring the Feasibility of Bottom-up Technology
    Minoru Miyahara
    2008 Volume 45 Issue 3 Pages 187-189
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.187
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  • My Impressions on the 43rd Summer Symposium
    Syuji Fujii
    2008 Volume 45 Issue 3 Pages 190
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.190
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  • My Impressions on the 43rd Summer Symposium
    Sayaka Yanagida
    2008 Volume 45 Issue 3 Pages 190a
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.190a
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  • My Impressions on the 43rd Summer Symposium
    Yasunobu Kaneko
    2008 Volume 45 Issue 3 Pages 190b-191
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.190b
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  • [title in Japanese]
    2008 Volume 45 Issue 3 Pages 191
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.191
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  • Doctoral Thesis Introduction
    2008 Volume 45 Issue 3 Pages 192-193
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.192
    JOURNAL FREE ACCESS
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  • Activity Report of Working Group on Particle Nano-technology 2005-2006
    Hidehiro Kamiya
    2008 Volume 45 Issue 3 Pages 194
    Published: March 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.194
    JOURNAL FREE ACCESS
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