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Preparation of Ion-Selective AAO Membranes for Concentration-Gradient Power Generation
Tissasera Iseki,유성일 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
A concentration gradient is a promising source of energy that can be converted into electrical energy by an ion exchange membrane. The movement of charged ions through membrane channels generates an ionic current that flows down an electrochemical gradient. Since nanopores can substantially increase the ion transportation compared with non-structured membranes, anodic aluminum oxide (AAO) membrane has been previously employed as nanofluidic system. In this study, to enrich the charge density on the AAO, the surface of AAO membrane was functionalized with 3-(aminopropyl) triethoxysilane (APTES). Then, the APTES-modified AAO was filled with positively-charged hydrogel of poly(3-acrylamidopropyl) trimethylammonium chloride. By applying the prepared composite membranes to salted solutions, we investigated their energy harvesting performance.
Hydrogel-based Nanochannel Membrane Utilizing AAO for Concentration Gradient Power Generation
Tissasera Iseki,유성일 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Nanofluidic channels has unique fluidic transport properties in the nanometer scale that can be utilized as a promising platform to improve the performance of conventional ion exchange membrane. In this regard, we fabricated poly(acrylic acid) (PAAc) hydrogel incorporated with anodic aluminum oxide (AAO) membrane as nano fluidics model system to utilize electric energy from the membrane. A commercialized AAO membrane with 20 nm pore diameter was functionalized by 3-(mercaptopropyl) trimethoxy silane (MPTS) silane coupling agent to promote interfacial adhesion and improve its properties. Then, PAAc hydrogel was synthesized onto the functionalized AAO membrane to build homogeneous nanochannel membrane structure. This model nanochannel system membrane utilizing hydrogel and AAO improve the energy harvesting performance in concentration cell application.
Tissasera Iseki,Merreta Noorenza Biutty,박철호,유성일 한국고분자학회 2023 Macromolecular Research Vol.31 No.3
The salinity gradient between seawater and river water is a type of Gibbs energy that can be converted into electrical energy by an ion-exchange membrane. Although the salinity gradient between two aqueous solutions can be adjusted in a laboratory to improve the energy-harvesting performance, the salinity gradient in natural resources is rather constant, restricting the prospects of membrane-mediated power generation. To address this issue, we demonstrate the local enhancement of the salinity gradient through hydrogel-functionalized anodic aluminum oxide (AAO) membranes. In the composite structure, the surface-modified AAO membrane attracts the mobile counter ions from the hydrogels to increase the local concentration of mobile ions inside the nanopores of AAO membrane. Owing to the local concentration enhancement, the hydrogel-functionalized AAO membranes could extract electrical energy with improved efficiency, which could power small electronic devices.