Design of superhydrophobic organosilica structure and thin layer fabrication of highly selective alcohol permeable membrane

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K21112
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 27:Chemical engineering and related fields
• Research Institution: Hiroshima University
• Principal Investigator: Kanezashi Masakoto 広島大学, 先進理工系科学研究科(工), 教授 (10467764)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Keywords: オルガノシリカ / 薄膜 / 超撥水性 / 吸着ブロッキング / 浸透気化特性

Outline of Final Research Achievements

In the present study, we investigated the effects of pore size and hydrophobicity of organosilica membranes on alcohol selective permeation property using pendant-type organosilica. The pendant-type organosilica structure was too small for alcohol molecules with molecular size of about 0.4-0.5 nm, so that these membranes showed H2O selective permeation properties.
F-doping was evaluated to control the loose network structure. F-doping into pendant-type organosilica greatly improved hydrophobicity, but the tendency for the pore size to increase with doped F concentration, which was observed with conventional F-doped bridged organosilica, was not observed.

Free Research Field

膜分離工学

Academic Significance and Societal Importance of the Research Achievements

地球レベルでの環境負荷が問題となる現在では，持続可能な社会を構築するために新規機能性材料や効率の良い生産方式の開発が極めて重要になる。膜分離工学は，国連が定めた，Sustainable Development Goals（SDGs，持続可能な開発目標）への貢献が大きい学問である。本研究では，薄膜化が可能で有機基の導入やアニオンドープにより親疎水性，細孔径制御が可能なアモルファスシリカを膜材料として用い，分子サイズが大きいアルコール分子が選択的に多孔膜を透過する分子選択性を付加した機能性高選択透過膜の創製について検討した。