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Mizutani R.,Tokai University | Suzuki Y.,Japan Synchrotron Radiation Research Institute
Micron | Year: 2012

Progress in high-resolution X-ray microtomography has provided us with a practical approach to determining three-dimensional (3D) structures of opaque samples at micrometer to submicrometer resolution. In this review, we give an introduction to hard X-ray microtomography and its application to the visualization of 3D structures of biological soft tissues. Practical aspects of sample preparation, handling, data collection, 3D reconstruction, and structure analysis are described. Furthermore, different sample contrasting methods are approached in detail. Examples of microtomographic studies are overviewed to present an outline of biological applications of X-ray microtomography. We also provide perspectives of biological microtomography as the convergence of sciences in X-ray optics, biology, and structural analysis. © 2011 Elsevier Ltd. Source

Osaka I.,Hiroshima University | Osaka I.,Japan Science and Technology Agency | Osaka I.,RIKEN | Saito M.,Hiroshima University | And 3 more authors.
Advanced Materials | Year: 2014

The backbone orientation in the thiophene-thiazolothiazole (TzTz) copolymer system can be altered by tuning of the alky side chain composition. We highlight that the orientation significantly impact their solar cell efficiency in particular when using thicker active layers. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Tamenori Y.,Japan Synchrotron Radiation Research Institute
Journal of Synchrotron Radiation | Year: 2013

Ambient-pressure soft X-ray photoabsorption spectroscopy (XAS) was demonstrated to be applicable to the chemical analysis of hydrated transition-metal compounds. For this purpose, even under ambient-pressure conditions, electron yield detection XAS (EY-XAS), based on a simple drain-current set-up, was used to overcome a weakness in fluorescence yield detection XAS (FY-XAS), which does not give a pure soft XAS. The feasibility of EY-XAS was investigated and it was clarified that the EY-XAS under ambient-pressure conditions corresponds to the mixed data of the total EY and conversion EY spectra. Normal ambient-pressure EY-XAS analysis was applied to anhydrous (CoCl2) and to hydrated (CoCl2·6H2O) cobalt chloride at the Co L 23-edge. The present measurements demonstrated the ability to unambiguously distinguish the different chemical states of cobalt ions, relying upon spectral differences that indicate octahedral/quasi-octahedral structural changes as a result of hydration/dehydration reactions. © 2013 International Union of Crystallography Printed in Singapore-all rights reserved. Source

Matsuda T.,University of Tsukuba | Kim J.,Japan Synchrotron Radiation Research Institute | Moritomo Y.,University of Tsukuba
Journal of the American Chemical Society | Year: 2010

We observed a reversible symmetry switch of a cobalt ferrocyanide framework by the alkaline cation exchange and resultant control of the optical properties at room temperature. © 2010 American Chemical Society. Source

Tamenori Y.,Japan Synchrotron Radiation Research Institute
Journal of Synchrotron Radiation | Year: 2010

A novel design for a differential pumping system has been investigated. This system allows windowless experiments in a soft X-ray beamline under normal atmospheric conditions. The new design consists of an aperture-based four-stage differential pumping system, based on a simple model calculation. A prototype system with a total length of 600 mm was constructed to confirm the validity of the design concept. Relatively short conductance-limiting components allow easy installation and alignment of the system on a synchrotron beamline. The fabricated system was installed on a beamline to test the transmission of soft X-rays through atmospheric helium. © 2010 International Union of Crystallography Printed in Singapore - All rights reserved. Source

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