Exploration of a standing mesochannel system with antimatter/matter atomic probes

Hiroyuki K.M. Tanaka, Yusuke Yamauchi, Toshikazu Kurihara, Yoshio Sakka, Kazuyuki Kuroda, Allen P. Mills

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Abstract

Positronium time-of-flight (Ps-TOF) spectroscopy was used to provide the accessibility of standing 2D hexagonal mesoporous film. The mesoporous film with perpendicular mesochannels was prepared by applying a magnetic field of 12T. The results show that all the 2D mesochannels are oriented parallel to the surface of the film, showing several morphologies such as S-, Y-, and swirl-shapes. The positron-implantation depth can be controlled precisely to a resolution of up to 10nm by changing the positron implantation energy. It is also found that the energy of the slow positron beam is 5 KeV, the beam size is 1 cm in diameter, and the beam intensity is 2×105 positrons/pulse. The results indicate that the micropores do not lead to significant Ps emission at higher implantation energies because the micropore density is low, leading to a large difference in the Ps emission rate between standing and lying 2D mesochannel systems.

Original languageEnglish
Pages (from-to)4728-4733
Number of pages6
JournalAdvanced Materials
Volume20
Issue number24
DOIs
Publication statusPublished - 2008 Dec 17

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ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Tanaka, H. K. M., Yamauchi, Y., Kurihara, T., Sakka, Y., Kuroda, K., & Mills, A. P. (2008). Exploration of a standing mesochannel system with antimatter/matter atomic probes. Advanced Materials, 20(24), 4728-4733. https://doi.org/10.1002/adma.200800395