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Advanced Materials

Exploration of a Standing Mesochannel System with Antimatter/Matter Atomic Probes

Authors

  • Hiroyuki K. M. Tanaka,

    Corresponding author
    1. Earthquake Research Institute, University of Tokyo 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032 (Japan)
    2. Physics Department, University of California Riverside CA 92521 (USA)
    3. Atomic Physics Laboratory, RIKEN 2-1 Hirosawa, Wako-shi, Saitama 351-0198 (Japan)
    • Earthquake Research Institute, University of Tokyo 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032 (Japan).
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  • Yusuke Yamauchi,

    1. World Premier International (WPI) Research Center International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) 1-1 Namiki, Tsukuba-shi, Ibaraki 305-0044 (Japan)
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  • Toshikazu Kurihara,

    1. Slow Positron Facility, Institute of Materials Science Structure Science (IMSS) High Energy Accelerator Research Organization (KEK) 1-1 Oho, Tsukuba-shi, Ibaraki 305-0801 (Japan)
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  • Yoshio Sakka,

    1. World Premier International (WPI) Research Center International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) 1-1 Namiki, Tsukuba-shi, Ibaraki 305-0044 (Japan)
    2. Nanoceramics Center, National Institute for Materials Science (NIMS) 1-2-1 Sengen, Tsukuba-shi, Ibaraki 305-0047 (Japan)
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  • Kazuyuki Kuroda,

    1. Department of Applied Chemistry, Faculty of Advanced Science and Engineering Waseda University 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555 (Japan)
    2. Kagami Memorial Laboratory for Materials Science and Technology, Waseda University 2-8-26 Nishi-Waseda, Shinjuku-ku, Tokyo 169-0051 (Japan)
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  • Allen P. Mills Jr.

    1. Physics Department, University of California Riverside CA 92521 (USA)
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  • The authors acknowledge Mr. M. Fuziwara (Kagami Memorial Laboratory for Materials Science and Technology, Waseda University) for preparation of TEM samples, and Mr. M. Sawada, Mr. M. Komatsu, and Mrs. A. Takai (Waseda University) for experimental support. The present study is supported by the Global COE Program “Practical Chemical Wisdom”, and the Encouraging Development Strategic Research Centers Program (Super COE) “Establishment of a Consolidated Research Institute for Advanced Science and Medical Care” from the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT). The present study is supported in part by the A3 Foresight Program “Synthesis and Structural Resolution of Novel Mesoporous Materials” from the Japan Society for the Promotion of Science (JSPS). This work was supported by a Grant-in-Aid for Scientific Research (No. 19850031) from JSPS.

Abstract

Positronium, a system consisting of an electron and its antimatter, a positron, offers a new technique to explore vertical accessibility and connectivity. Here, we show how this technique can be used to map out the vertical profile of mesoporous silica channel systems by comparing a standing (perpendicular to the substrate) 2D hexagonal with a lying (parallel to the substrate) 2D hexagonal mesoporous film.

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