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

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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
Issue number24
Publication statusPublished - 2008 Dec 17

ASJC Scopus subject areas

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


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