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High-Performance Gas Separation Membranes by Guided-Assembly of Graphene-based Nanocomposites

Research Project

Project/Area Number 19F19367
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Review Section Basic Section 26030:Composite materials and interfaces-related
Research InstitutionKyoto University

Principal Investigator

Sivaniah Easan  京都大学, 高等研究院, 教授 (10711658)

Co-Investigator(Kenkyū-buntansha) KARAHAN HUSEYIN  京都大学, 高等研究院, 外国人特別研究員
Project Period (FY) 2019-11-08 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2021: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2020: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2019: ¥900,000 (Direct Cost: ¥900,000)
KeywordsStable laminate membrane / Hydrogen selectivity / Nanosheet synthesis / Charge compensation / Nanolaminate fabrication / graphene oxide synthesis / membrane preparation
Outline of Research at the Start

Proposed work involves 3 tasks: 1) preparation of nanosheet-polymer mixtures, 2) fabrication of tape-coated membranes, (3) testing of separation performances. We will employ home-made/commercial graphene oxide nanosheets (negatively charged), and their amine-modified (positively charged) derivatives. To obtain gel-like slurries suitable for tape-coating, we will mix graphenic nanosheets with polymers (polyethyleneimine, polyallylamine). Last, we will prepare thin-film composite membranes by optimizing nanosheet/polymer ratios and casting parameters and test those for hydrogen gas separation.

Outline of Annual Research Achievements

Our research achievements in this project are threefold. First, we have found that the GO-polycation composites coagulate too fast to give uniform slurries and, thus, defect-free gas separation membranes. At high GO-polycation loadings (high concentrations), we could obtain conformal coatings with rod/blade-coating methods. But the resulting membranes became too thick but were still often defective because of fast aggregation. We could produce smoother coatings using non-polyelectrolytes (such as hydrogen-bondable polymers) but still observed only low hydrogen selectivity. However, when we used positively charged nanoparticles and vacuum filtration, we achieved conformal and defect-free membranes, yielding selectivities up to 150 and permeabilities up to around 4000 GPU. Based on the experiments made with polymer-free nanosheet dispersions, we also found that vacuum filtration can be used for compacting membranes that are prepared by other coating methods such as spray-coating. Overall, this collaborative research resulted in the establishment of four fundamental notions: (1) Electrostatic interactions are highly effective in stabilizing GO-based membranes; (2) guided-assembly methods (such as vacuum-assisted filtration and vacuum-spray-coating) should be optimized for achieving defect-free membranes; (3) composite membranes should be polymer-free or rich in nanosheets for developing defect-free membranes with high hydrogen selectivity.

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (1 results)

All 2021

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results)

  • [Journal Article] Overcoming humidity-induced swelling of graphene oxide-based hydrogen membranes using charge-compensating nanodiamonds2021

    • Author(s)
      Huang Guoji、Ghalei Behnam、Pournaghshband Isfahani Ali、Karahan H. Enis、Terada Daiki、Qin Detao、Li Conger、Tsujimoto Masahiko、Yamaguchi Daisuke、Sugimoto Kunihisa、Igarashi Ryuji、Chang Bor Kae、Li Tao、Shirakawa Masahiro、Sivaniah Easan
    • Journal Title

      Nature Energy

      Volume: 6 Issue: 12 Pages: 1176-1187

    • DOI

      10.1038/s41560-021-00946-y

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research

URL: 

Published: 2019-11-29   Modified: 2024-03-26  

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