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2006 Fiscal Year Final Research Report Summary

Gas Transport Properties of Ion-irradiated Membrane with Nano-channel

Research Project

Project/Area Number 16310062
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental technology/Environmental materials
Research InstitutionTokyo Metropolitan University

Principal Investigator

NAGAOKA Shoji  Tokyo Metropolitan University, Dept. of Applied Chemistry, Professor, 都市環境科学研究科, 教授 (30254147)

Co-Investigator(Kenkyū-buntansha) KAWAKAMI Hiroyoshi  Tokyo Metropolitan University, Dept. of Applied Chemistry, Professor, 都市環境科学研究科, 教授 (10221897)
SUZUKI Yoshiaki  RIKEN Achanced Developinent and SuPPorting Cente, Researcher, 先端技術開発支援センター, 専任研究員 (40342802)
Project Period (FY) 2004 – 2006
KeywordsIon Irradiation / Polyimide / Nano-channel / Gas Fermeability / Gas Separation Membrane / Ultrathin Membrane
Research Abstract

In this research, the gas permeance and selectivity of the asymmetric polyimide membrane irradiated by ions were measured using a high vacuum apparatus with a Baratron absolute pressure gauge at 76cmHg and 35°C. The asymmetric polyimide membranes were prepared from a dry-wet phase inversion process, and the surface skin layer on the membrane was irradiated by ions in the fluence range from lx1012 to 3x1015(He+/cm2) at 50keV. We demonstrated that the gas selectivity of the He+-irradiated membrane increased with an increase in the ion fluence and that the depth profile of the energy loss for the irradiating ions in the skin layer had a significant influence on the gas permeability and selectivity of the asymmetric membrane.
The gas permeances for the membrane showed an increase at a low ion fluence and a decrease at a high ion fluence. On the other hand, the gas selectivity increased with an increase in the ion fluence. One possibility may be that the gas permeation space, which can provide a high degree of size and shape discrimination between the gas molecules, was formed on the ion-irradiated skin surface and suppressed the permeability of N_2 and CH_4 rather than that of O_2 and CO_2. Another interesting conclusion is that the thickness of the ion-irradiated skin layer had a significant influence on the gas permeability and selectivity. The polyimide structure in the ion-irradiated surface layer would be closely correlated to the amount of ion energy loss so that the structure may determine the free volume and the free volume distribution formed in the membrane.
It is desirable to prepare a polymer membrane with both a high gas permeability and selectivity for gas separation. The ion-irradiated asymmetric polyimide membrane prepared in this study showed interesting gas permeation results, and we consider that the ion irradiation would be one of the important membrane fabrication techniques for realizing a high gas permeability and selectivity.

  • Research Products

    (5 results)

All 2007 2006 2005

All Journal Article (5 results)

  • [Journal Article] Gas transport properties of asymmetric polyimide membranes prepared by ion-beam irradiation2007

    • Author(s)
      S.Sannomiya, K.Fukui, S.Nagaoka, Y.Suzuki, M.Iwaki, H.Kawakami
    • Journal Title

      J. Polym. Sci., Polym. Phy. 45

      Pages: 262-269

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Gas transport properties of asymmetric polyimide membranes prepared by ion-beam irradiation2007

    • Author(s)
      S.Sannomiya, K.Fukui, S.Nagaoka, Y.Suzuki, M.Iwaki, H.Kawakami
    • Journal Title

      J.Polym.Sci., Polym.Phy. 45

      Pages: 262-269

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Gas Diffusion and Solubility in He+-irradiated Asymmetric Polyimide Membranes2006

    • Author(s)
      S.Sannomiya, S.Nagaoka, Y.Suzuki, M.Iwaki, H.Kawakami
    • Journal Title

      Polymer 47

      Pages: 6585-6591

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Preparation of Novel Fluorinated Block Copolyimide Membranes for Gas Separation2006

    • Author(s)
      M.NIWA, S.NAGAOKA, H.KAWAKAMI
    • Journal Title

      J. Appl. Polym. Sci. 100

      Pages: 2436-2442

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Gas permeation properties of asymmetric polyimide membranes made by ion-beam irradiation2005

    • Author(s)
      T.Sannomiya, M.Iwase, S.Nagaoka, Y.Suzuki, M.Iwaki, H.Kawakami
    • Journal Title

      Appl.Membr.Sci.Technol. 1

      Pages: 19-28

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2008-05-27  

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