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Volume 82 , Issue 9
Showing 1-18 articles out of 18 articles from the selected issue
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Preface
Comprehensive Papers (Invited Paper)
  • Toshinori MOTEGI, Baku TAKIMOTO, Hideki NABIKA, Kei MURAKOSHI
    Volume 82 (2014) Issue 9 Pages 712-719
    Released: September 05, 2014
    JOURNALS OPEN ACCESS
    Previously documented results on molecule manipulation using metal nanogates are comprehensively reviewed to conclude novel characteristics, which could be widely used for the developments of the systems at electrified interfaces. Novel systems to segregate molecules from self-spreading lipid bilayers in electrolyte solutions have been developed by using metal nanogate structures on solid surfaces. The spatial distribution of target molecules in the lipid bilayer changes depending on the molecule characteristics, such as charge, size, and flexibility. Energy dissipation during the spreading of the molecules on the surface contributes to the compression of the lipid bilayer at the nanogate, leading to the formation of a gradient of the electrochemical potential of the bilayer system including the target molecule in the vicinity of the nanogate (<100 nm from the gate). The gradient results in a segregation force being applied to target molecules in the order of 10−15 N per molecule. The segregation property can be tuned by changing the electrolytes, lipid molecules, temperature, and the width and surface hydrophobicity of the metal nanogate. Introduction of asymmetry to the nanogate leads to further effective diffusion control in a direction perpendicular to the spreading. It has been demonstrated that target molecules with a different number of glycolipid per protein in the lipid bilayer are effectively separated based on the Brownian ratchet mechanism.
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  • Tsuyoshi OCHIAI
    Volume 82 (2014) Issue 9 Pages 720-725
    Released: September 05, 2014
    JOURNALS OPEN ACCESS
    This paper summarized the author’s recent studies about effective design of the systems for environmental and dental application of TiO2 photocatalysts and boron-doped diamond (BDD) electrodes. The titanium mesh impregnated photocatalyst, TMiP™ has been fabricated as a novel photocatalytic filter. The high mechanical flexibility of TMiP allows us to design any geometry of modules by combination of UV-sources and the other technologies. In this paper, a practical air-cleaner using the TMiP-plasma synergistic reactor was fabricated and installed in a real-scale smoking room in the office. The amounts of the compounds in tobacco smoke were almost totally removed by the air-cleaner. On the other hands, the author also reported the possibilities of wastewater treatments by electrolysis with BDD electrodes. Based on these studies, a novel pinpoint ozone-water production unit for dental treatment using of BDD microelectrodes was developed. The unit showed almost the same sterilization ability as conventional 20 ppm of aqueous sodium hypochlorite treatment in in vitro assessment in the root-canal of bovine teeth. These results present several key solutions for practical applications of TiO2 photocatalysis and BDD electrolysis.
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  • Yukina TAKAHASHI, Sunao YAMADA, Tetsu TATSUMA
    Volume 82 (2014) Issue 9 Pages 726-729
    Released: September 05, 2014
    JOURNALS OPEN ACCESS
    We have developed three types of photoelectrochemical nanomaterials and devices based on metal and/or semiconducting metal oxide nanoparticles for effective use of light energy. Photocatalysts with oxidative energy storage abilities were developed by coupling a photocatalyst with a rechargeable metal oxide or metal hydroxide nanomaterial to address an issue that TiO2 photocatalyst does not function after dark. Plasmonic metal nanoparticle ensembles were thermally and/or chemically stabilized by using a metal oxide nanomask or ultrathin metal oxide coating and applied to localized surface plasmon resonance sensors and photovoltaic cells based on the plasmon-induced charge separation. Organic and organic-inorganic hybrid photoelectrodes were also developed to give photocurrents enhanced by optimally arranged plasmonic metal nanoantennas.
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  • Kohei MIYAZAKI
    Volume 82 (2014) Issue 9 Pages 730-735
    Released: September 05, 2014
    JOURNALS OPEN ACCESS
    Anion-exchange membrane fuel cell (AEMFC) is a relatively new member of the family of polymer electrolyte fuel cells (PEFCs) as an electrochemical system for electric power sources. Alkaline environment in the anion-exchange membranes provides some advantageous characteristics for AEMFCs. In this comprehensive paper, some attractive features of AEMFCs are briefly explained as compared with proton-exchange membrane fuel cells (PEMFCs), and our recent results on electrocatalysts and triple-phase boundary in AEMFCs are discussed.
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Articles
  • Shigeru WATARIGUCHI, Yusuke UENO, Masaaki FUJIMORI, Teruo HINOUE
    Volume 82 (2014) Issue 9 Pages 736-742
    Released: September 05, 2014
    JOURNALS OPEN ACCESS
    Fullerene, C60, is readily reduced to its anion radical, C60•−, in nitrobenzene (NB) that contains a tetraphenylborate ion (TPB) under irradiation with visible light. Fullerene excited by visible light withdraws one electron from TPB to form C60•− and generated TPB radical decomposes. C60•− can be stored for several days without any changes in deaerated NB. However, as soon as the NB solution containing C60•− is bubbled with air, C60•− immediately oxidizes to C60. Using this photochemical reaction of C60, we have developed a new-type of photovoltaic cell that can generate and store electricity. We call this cell a photoelectrochemical condenser (PEC). The anodic reaction of the PEC is the oxidation of C60•− to C60; although many reduction reactions are possible, the cathodic reaction is chosen to be the reduction of Fe3+ to Fe2+ in an aqueous phase. When the PEC was irradiated with visible light ranging from 400 nm to 700 nm (23.4 mW cm−2), the electromotive force was measured to be approximately 1100 mV, and an electric current of approximately 2 mA was observed. In this paper, we present the PEC and discuss its performance for generating and storing electricity.
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  • Haiping YANG, Shenghai YANG, Motang TANG, Bihui LI
    Volume 82 (2014) Issue 9 Pages 743-748
    Released: September 05, 2014
    JOURNALS OPEN ACCESS
    High purity tantalum ethoxide (99.997%) was successfully synthesized using electrosynthesis method and characterized by IR and 1H-NMR spectra, the influence of various factors on the electrosynthesis process and the distillation purification of tantalum ethoxide was also studied. Cell voltage was closely related to process parameters such as electrolyte species, electrolyte concentration, electrode distance, solution temperature, current density and electrolysis time et al. All the current efficiencies were higher than 100%, which might be related to the low valence sate of tantalum. The ideal conditions for the electrosynthesis of tantalum ethoxide were also obtained. The purity of tantalum ethoxide increased when increasing reflux ratio. Infrared spectra conformed to chemical bonds excellently, and the peak area ratio of nuclear magnetic resonance coincided with number ratio of hydrogen atoms.
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