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Engineering
| 40 |
Motokura, K.; Fujita, N.; Mori, K.; Mizugaki, T.; Ebitani, K.;
Kaneda, K.
(Graduate School of Engineering Science) An Acidic Layered Clay Is Combined with a Basic Layered Clay for One-Pot Sequential Reactions Journal of the American Chemical Society, 127, 9674-9675 (2005) This paper describes the one-pot sequential reactions using a Ti 4+ -exchanged montmorillonite (Ti 4+ -mont) and a hydrotalcite (HT) as strong solid acid and base catalysts, respectively. Because the Ti 4+ -mont has acid sites in the narrow interlayers, the surface base sites of large HT particles can not interact with the acid sites. Using both the solid catalysts, a variety of acid and base reactions, such as esterification, acetalization, deacetalization, aldol reaction, Michael reaction, and epoxidation, proceeded in a single reactor. |
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| 41 |
Tsuda, M.
*1;
Diño, W.A.
*2,3;
Kasai, H.
*1
*1 (Graduate School of Engineering) *2 (Graduate School of Science) *3 (Center for the Promotion of Research on Nanoscience and Nanotechnology) Behavior of Hydrogen Atom at Nafion-Pt Interface Solid State Communications, 134, 601-605 (2005) We present a mechanism depicting how a hydrogen atom migrates from a platinum catalyst to a Nafion membrane using ab initio density functional calculations. The H atom initially adsorbed on Pt is extracted by the sulfonate group. We find partial electron transfer from the H atom to the Pt through this reaction. The electron-poor H atom conducts in Nafion, and the partial electron transfer from the H atom results in the generation of electric power in polymer electrolyte fuel cells. |
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| 42 |
Ikuno, T.
*1;
Honda, S.
*1;
Yasuda, T.
*1;
Oura, K.
*1;
Katayama, M.
*1;
Lee, J. G.
*2;
Mori, H.
*2
*1 (Graduate School of Engineering) *2 (Research Center for Ultra-High Voltage Electron Microscopy) Thermally Driven Nanomechanical Deflection of Hybrid Nanowires Applied Physics Letters, 87, 213104/1-3 (2005) This paper reports on the observation of thermally induced nanomechanical deflection of a hybrid inorganic nanowire synthesized by pulsed-laser deposition, the structure of which is a carbon nanotube template sandwiched by aluminum oxide and tungsten oxide thin layers. The hybrid nanowire was gradually bent at a specimen temperature ranging from room temperature to 800 °C, due to the different coefficients of thermal expansion of the coated layers. This mechanical deflection exhibited repeatability. |
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| 43 |
Ono, A.
; Kato, J.;
Kawata, S.
(Graduate School of Engineering) Subwavelength Optical Imaging through a Metallic Nanorod Array Physical Review Letters, 95, 267407/1-4 (2005) |
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| 44 |
Imai, S.; Fujimoto, M.;
Asuha,; Takahashi, M.;
Kobayashi, H.
(Institute of Scientific and Industrial Research) Formation of Atomically Smooth SiO 2 /SiC Interfaces at ~120°C by Use of Nitric Acid Oxidation Method Surface Science, 600, 547-550 (2006) We have developed a method of oxidizing SiC at ~120°C to form relatively thick (e.g., 8 nm) SiO 2 layers by use of nitric acid. The SiO 2 /SiC interface is atomically flat, and the MOS diodes formed by the nitric acid oxidation method possess a considerably low leakage current density. |
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| 45 |
Yamagami, R.;
Kobayashi, K.
; Saeki, A.; Seki, S.; Tagawa, S.
(Institute of Scientific and Industrial Research) Photogenerated Hole Mobility in DNA Measured by Time-Resolved Microwave Conductivity Journal of the American Chemical Society, 128, 2212-2213 (2006) Time-resolved microwave technique allows measurement of the conductivity of photogenerated charge carriers on an isolated molecular chain without an attached electrode. This method was applied to the charge transport in DNA. We report the first direct observation of charge transport dynamics using time-resolved microwave conductivity and transient absorption spectroscopy techniques, on photolysis of an anthraquinone-bound DNA-complex. |
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| 46 |
Lee, J-G.
*1; Lee, J.;
Tanaka, T.
*2;
Mori, H.
*1
*1 (Research Center for Ultra High Voltage Electron Microscopy) *2 (Graduate School of Engineering) In Situ HREM Observation of Crystalline-to-Gas Transition in Nanometer-sized Ag Particles Physical Review Letters, 96, 075504/1-3 (2006) |
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| 47 |
Kaminishi, D.; Ozaki, H.; Ohno, Y.;
Maehashi, K.
; Inoue, K.; Matsumoto, K.
Seri, Y.; Masuda, A.; Matsumura, H.
(Institute of Scientific and Industrial Research) Air-Stable N -Type Carbon Nanotube Field-Effect Transistors with Si 3 N 4 Passivation Films Fabricated by Catalytic Chemical Vapor Deposition Applied Physics Letters, 86, 113115/1-3 (2005) |
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| 48 |
Endo, M.
; Seeman, N. C.;
Majima, T.
(Institute of Scientific and Industrial Research) DNA Tube Structures Controlled by a 4-Way-Branched DNA Connector Angewandte Chemie International Edition, 44, 6074-6077 (2005) The paper describes a method for the construction of “DNA nanotube” using the DNA tile system with assistance of a four-way branched DNA-porphyrin connector. The connector controlled the self-assembly of the DNA tiles which form two-dimensional planar structures to be one-dimensional fiber-like structures. The detailed observation by atomic force microscopy revealed that the DNA assembly formed a periodic tubular structure having the length over 20 μm with uniform diameter. The programmed nanostructure formation using these designed DNAs serves for the construction of the various nano-scale architectures and materials. |
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| 49 |
Masui, T.
; Mayama, Y.; Koyabu. K.; Imanaka, N.
(Graduate School of Engineering) Synthesis of New Green-emitting Gd 2 O 2 CO 3 :Tb 3+ Fine Particles with High Luminescence Intensities Chemistry Letters, 34, 1236-1237 (2005) New green-emitting Gd 2 O 2 CO 3 :xTb 3+ fine particles have been synthesized by our original flux method using the 0.476Li 2 CO 3 –0.270Na 2 CO 3 –0.254K 2 CO 3 eutectic mixture. In the series of the oxycarbonate phosphors, Gd 2 O 2 CO 3 :16.9at%Tb 3+ showed the highest emission intensity. On the contrary to the general tendency that the luminescent intensity usually decreases with the particle size reduction, the relative emission intensity of the Gd 2 O 2 CO 3 :16.9at%Tb 3+ fine particles (0.26 μm) was equivalent (101%) to that of the larger commercial LaPO 4 :Ce 3+ ,Tb 3+ (2.7 μm). |
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| 50 |
Matsuda, H.
*1;
Fujimoto, Y.
*1;
Ito, S.
*1;
Nagasawa, Y.
*1;
Miyasaka, H.
*1;
Asahi, T.
*2;
Masuhara, H.
*2
*1 (Graduate School of Engineering Science and Research Center for Materials Science at Extreme Conditions) *2 (Graduate School of Engineering) Development of Near-Infrared 35 fs Laser Microscope and Its Application to the Detection of Three- and Four-Photon Fluorescence of Organic Microcrystals Journal of Physical Chemistry B, 110, 1091-1094 (2005) |
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