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About Overview Organization & Management Strategy Open Positions Movie Library Access Research Structure Researchers & Laboratories Research Areas Three Advanced Target Projects Collaboration Achievements Press Releases Media & Award AIMResearch Publications Topics News Seminars & Symposium International Satellites International Partner Institutions Inter-Faculty Exchange Agreements Researcher Exchange Programs Support Support Systems For International Researchers (IAC) For Visitors Researchers for Visitors for Researchers for Enterprise Access AIMR Fund Japanese Research Highlights Perforated honeycomb thin films: A new approach to oil-water separation 12/25/2023 Engineered lubrication for precise control and broadened adaptability Dr. Yabu, the corresponding author of this article Controlled oil-water separation is critical to solving problems concerning environmental contamination, water resource management, and industrial liquid separation. To this end, one approach focuses on the isolation of extremely thin membranes as the filtering medium. “In conventional oil-water separation media, thicker membranes usually improve separation, because the mechanism relies on the adhesion of one of the liquids to the membrane surfaces,” says Hiroshi Yabu, the principal investigator of an AIMR research team. “In this work, we ask whether a lubricated thin membrane can be engineered to stop either oil or water from diffusing through—achieving separation.” In a 2022 article, Yabu’s team used the breath-figure technique to fabricate single-layer (~10 µm) honeycomb porous polymer films1. Using ultraviolet-ozone treatment to change the surface compositions, the team was able to control the pore size and wettability of the thin films, inducing lubrication by either oil or water. The team further demonstrated that these micron-thick films are capable of performing milliliter-scale gravimetric oil-water separation. Structural image of honeycomb porous polymer films “While previous reports used the membrane surface property itself (e.g., superhydrophobicity) to separate oil from water, we use the surface property to control which liquid fills the membrane to let that liquid through,” explains Yabu. “This approach significantly broadens the adaptability of the separation process using external stimuli such as the ultraviolet-ozone treatment.” Earlier work by the same group had suggested the possible use of the honeycomb membrane in gas-liquid separation2 and in lithium-ion conductivity applications3. A future direction will use this technique to address PFAS (per- and polyfluoroalkyl substances) removal from water resources at large. (Author: Patrick Han) References Chen, B., Wada, T. & Yabu, H. Amphiphilic perforated honeycomb films for gravimetric liquid separation Advanced Materials Interfaces 9, 2101954 (2022). | article Chen, B., Wada, T. & Yabu, H. Underwater bubble and oil repellency of biomimetic pincushion and plastron-like honeycomb films Langmuir 36, 6354-6369 (2020). | article Grewal, M.S., Kisu, K., Orimo, S. & Yabu, H. Increasing the ionic conductivity and lithium-ion transport of photo-cross-linked polymer with hexagonal arranged porous film hybrids iScience 25, 104910 (2022). | article This research highlight has been approved by the authors of the original article and all information and data contained within has been provided by said authors. keywords perforated honeycomb films oil-water separation breath-figure technique membrane lubrication ultraviolet-ozone treatment Tweet more Research Highlights Achievements Press Releases 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 Media & Award 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 AIMResearch About AIMResearch Research Highlights 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 In the Spotlight 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 Email Alert Sign up Publications Headlines 2024/05/31 Dr. Yi Shuang selected to receive a Hara... 2024/05/22 Machine Learning Accelerates Discovery o... 2024/05/16 New Data-Driven Model Rapidly Predicts D... Seminars & Symposium 2024/05/01 [5/1] The 5th “AIMR Seminar” 2024/04/26 [4/26] The 4th “AIMR Seminar” [5/10] The 6th “AIMR Seminar” AIMResearch PDF Research Highlights 2021 Download a FREE PDF of AIMResearch 2021 Download previous issue AIMResearch 2021 AIMResearch 2020 AIMResearch 2019 AIMResearch 2018 AIMResearch 2017 AIMResearch 2016 AIMResearch 2015 AIMResearch 2014 AIMResearch 2013 AIMResearch 2012 AIMResearch 2011 AIMResearch 2010 AIMResearch 2009 Home Research AIMResearch Research Highlights 2023 Perforated honeycomb thin films: A new approach to oil-water separation TOHOKU UNIVERSITY World Premier International Research Center Initiative For AIMR Members Link Site map Copyright © 2020 Tohoku University. All Rights Reserved.