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X-ray phase contrast imaging study of activated carbon/carbon composite

Published online by Cambridge University Press:  10 February 2011

Kenji Kobayashi ,
Koichi Izumi ,
Hidekazu Kimura ,
Shigeru Kimura ,
Tomoaki Ohira ,
Takashi Saito ,
Yukari Kibi ,
Takashi Ibuki ,
Kengo Takai  and
Yoshiyiki Tsusaka
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Kenji Kobayashi
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501 Japan.
Koichi Izumi
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501 Japan.
Hidekazu Kimura
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501 Japan.
Shigeru Kimura
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501 Japan.
Tomoaki Ohira
Affiliation:
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501 Japan.
Takashi Saito
Affiliation:
Functional Material Research Laboratories, NEC Corporation, 4-1-1 Miyazaki, Miyamae, Kawasaki, Kanagawa 216-8555 Japan.
Yukari Kibi
Affiliation:
Functional Material Research Laboratories, NEC Corporation, 4-1-1 Miyazaki, Miyamae, Kawasaki, Kanagawa 216-8555 Japan.
Takashi Ibuki
Affiliation:
Faculty of Science, Himeji Institute of Technology, 3-2-1 Koto, Ako, Hyogo 678-1297 Japan.
Kengo Takai
Affiliation:
Faculty of Science, Himeji Institute of Technology, 3-2-1 Koto, Ako, Hyogo 678-1297 Japan.
Yoshiyiki Tsusaka
Affiliation:
Faculty of Science, Himeji Institute of Technology, 3-2-1 Koto, Ako, Hyogo 678-1297 Japan.
Yasushi Kagoshima
Affiliation:
Faculty of Science, Himeji Institute of Technology, 3-2-1 Koto, Ako, Hyogo 678-1297 Japan.
Junji Matsui
Affiliation:
Faculty of Science, Himeji Institute of Technology, 3-2-1 Koto, Ako, Hyogo 678-1297 Japan.
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Abstract

We have obtained the x-ray phase contrast images of the activated carbon/carbon (AC/C) composite used as electrodes in an electric double-layer capacitor (EDLC). To improve the spatial resolution, the beam size of x-ray transmitted from a sample were expanded by using asymmetric Bragg diffraction (asymmetric factor b) of analyzer crystal. Since the analyzer crystals were placed in (+, -) arrangements in both vertical and horizontal directions, the total magnification factor was 1/b2 for each direction. By using the 511 asymmetric Bragg diffraction of Si (100) analyzer with an asymmetric factor of 0.207, we could obtain the magnification factor of about 23.3. We applied this optical system to the AC/C composite. The phase contrast image corresponding to the carbon particles with the diameter of about 10 μm could be detected with the spatial resolution of 5 μm. Furthermore, we also obtained realtime images of bubble formation and movement during the overcharging of an EDLC with the time resolution of 30 frames number per second.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 590: Symposium R – Applications of Synchrotron Radiation Techniques…V , 1999 , 273
Copyright
Copyright © Materials Research Society 2000

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References

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