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ガイドで組み立てられたグラフェンを用いたナノコンポジットによるガス分離膜

研究課題

研究課題/領域番号 19F19367
研究種目

特別研究員奨励費

配分区分補助金
応募区分外国
審査区分 小区分26030:複合材料および界面関連
研究機関京都大学

研究代表者

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

研究分担者 KARAHAN HUSEYIN  京都大学, 高等研究院, 外国人特別研究員
研究期間 (年度) 2019-11-08 – 2022-03-31
研究課題ステータス 完了 (2021年度)
配分額 *注記
2,200千円 (直接経費: 2,200千円)
2021年度: 300千円 (直接経費: 300千円)
2020年度: 1,000千円 (直接経費: 1,000千円)
2019年度: 900千円 (直接経費: 900千円)
キーワードStable laminate membrane / Hydrogen selectivity / Nanosheet synthesis / Charge compensation / Nanolaminate fabrication / graphene oxide synthesis / membrane preparation
研究開始時の研究の概要

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.

研究実績の概要

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.

現在までの達成度 (段落)

令和3年度が最終年度であるため、記入しない。

今後の研究の推進方策

令和3年度が最終年度であるため、記入しない。

報告書

(3件)
  • 2021 実績報告書
  • 2020 実績報告書
  • 2019 実績報告書
  • 研究成果

    (1件)

すべて 2021

すべて 雑誌論文 (1件) (うち国際共著 1件、 査読あり 1件)

  • [雑誌論文] Overcoming humidity-induced swelling of graphene oxide-based hydrogen membranes using charge-compensating nanodiamonds2021

    • 著者名/発表者名
      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
    • 雑誌名

      Nature Energy

      巻: 6 号: 12 ページ: 1176-1187

    • DOI

      10.1038/s41560-021-00946-y

    • 関連する報告書
      2021 実績報告書
    • 査読あり / 国際共著

URL: 

公開日: 2019-11-29   更新日: 2024-03-26  

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