Nanoscience and Nanotechnology Research Center

Japan

Nanoscience and Nanotechnology Research Center

Japan
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Jang K.,University of Tokyo | Wang C.,University of Tokyo | Wang C.,Japan Science and Technology Agency | Xu Y.,Nanoscience and Nanotechnology Research Center | And 2 more authors.
Proceedings of the 16th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2012 | Year: 2012

We developed room-temperature bonding of micro-nanofluidic device using fluorine induced plasma activation method. Fluorine was induced by O2 reactive ion etching (RIE) plasma treatment with Teflon Pieces which increased the bonding strength between fused silica glass substrates. The room-temperature bonded fused silica glass micro-nanofluidic device had high bonding strength as well as could work continuously without leakage during liquid introduction driven by air pressure even at 2000 kPa.


Dong Y.,Chinese Academy of Inspection and Quarantine | Xu Y.,University of Tokyo | Xu Y.,Nanoscience and Nanotechnology Research Center | Xu Y.,Japan Science and Technology Agency | And 9 more authors.
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2011

In order to tackle both regional and global foot-and-mouth disease virus (FMDV) epdimics, we hereby develop a rapid microfluidic thermal lens microscopic method to screen swine type O FMDV with good efficiency. The scheme has great merits in terms of field portability, sample volume, assay time, analytical sensitivity, and test reproducibility. © 2011 The Royal Society of Chemistry.


Kosuga A.,Nanoscience and Nanotechnology Research Center | Plirdpring T.,Osaka University | Higashine R.,Nanoscience and Nanotechnology Research Center | Matsuzawa M.,Nanoscience and Nanotechnology Research Center | And 2 more authors.
Applied Physics Letters | Year: 2012

We investigated the high-temperature thermoelectric properties of Cu 1-xInTe 2 (x 0, 0.05, 0.1, 0.2) at 310-710 K. The electrical properties of this system were optimized by the presence of substoichiometric amounts of copper and additional phonon scattering by lattice defects and a secondary phase reduced the thermal conductivity of the system. The samples of Cu 1-xInTe 2 (x 0, 0.05, 0.1, 0.2) all had dimensionless figures of merit in excess of 0.5 at 710 K with a maximum value of 0.54 for x 0.1. © 2012 American Institute of Physics.


Kosuga A.,Nanoscience and Nanotechnology Research Center | Higashine R.,Nanoscience and Nanotechnology Research Center | Plirdpring T.,Osaka University | Matsuzawa M.,Nanoscience and Nanotechnology Research Center | And 2 more authors.
Japanese Journal of Applied Physics | Year: 2012

We prepared and investigated the thermoelectric properties of Cu 0.4InTe2 at 310-710 K. The crystal structure of Cu 0.4InTe2 was identical to that of CuIn3Te 5, namely a tetragonal structure, space group P4̄2c, known as an ordered defect chalcopyrite. This structure is different from that of CuInTe2, which has a normal chalcopyrite structure. In comparison with CuInTe2, Cu0.4InTe2 showed inferior thermoelectric properties because a degradation in its electrical conductivity outweighed a reduction in its thermal conductivity. The maximum dimensionless figure of merit of Cu0.4InTe2 was 0.17 at 702 K. © 2012 The Japan Society of Applied Physics.


Moreno M.,Chilean Center of Nanosciences and Nanotechnology | Moreno M.,Metropolitan University of Technology | Moreno M.,University of Chile | Quijada R.,University of Chile | And 7 more authors.
Electrochimica Acta | Year: 2011

Solvent-free solid polymer electrolytes (SPEs) based on two different poly(ethylene oxide), PEO Mw 600,000 and 4,000,000 and intercalated clays are reported. The inorganic additives used were lithiated bentonite and the nanocomposite PEO@bentonite with the same polymer used as matrix. SPE films, obtained in the scale of grams by mixing the components in a Brabender-type batch mixer and molding at 130 C, were characterized by X-ray diffraction analysis, UV-vis spectroscopy, and thermal analysis. During the preparation of the films, the unmodified clay got intercalated in situ. Comparative analysis of ionic conductivity and mechanical properties of the films show that the conductivity increases with the inclusion of fillers, especially for the polymer with low molecular weight. This effect is more pronounced when using PEO@bentonite as additive. Under selected work conditions, avoiding the presence of crystalline lithium complexes, observed effects are mainly centered on the polymer. An explanation, considering the higher affinity between the modified clay and PEO matrix which leads to differences in the micro homogeneity degree between both types of polymer electrolytes is proposed. © 2011 Elsevier Ltd. All rights reserved.

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