Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/156974
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dc.contributor.authorLim, Yu Jieen_US
dc.contributor.authorGoh, Kunlien_US
dc.contributor.authorLai, Gwo Sungen_US
dc.contributor.authorZhao, Yalien_US
dc.contributor.authorTorres, Jaumeen_US
dc.contributor.authorWang, Rongen_US
dc.date.accessioned2022-04-28T06:54:16Z-
dc.date.available2022-04-28T06:54:16Z-
dc.date.issued2021-
dc.identifier.citationLim, Y. J., Goh, K., Lai, G. S., Zhao, Y., Torres, J. & Wang, R. (2021). Unraveling the role of support membrane chemistry and pore properties on the formation of thin-film composite polyamide membranes. Journal of Membrane Science, 640, 119805-. https://dx.doi.org/10.1016/j.memsci.2021.119805en_US
dc.identifier.issn0376-7388en_US
dc.identifier.urihttps://hdl.handle.net/10356/156974-
dc.description.abstractNanoscale characteristics of the polyamide layer are key towards the high desalination performance of thin-film composite reverse osmosis (TFC-RO) membranes. Further advancements in the performance of TFC membranes necessitate a comprehensive understanding of the desired polyamide characteristics and its formation mechanisms. Empirical evidence has shown that the properties of the support layer is as equally important as the interfacial polymerization (IP) conditions in the fabrication of high permselectivity TFC membranes for desalination. Herein, we discuss the properties of polyamide layers formed using identical IP conditions over support membranes of different polymers and chemistries (polyethersulfone, polyetherimide and polysulfone) under fairly similar surface pore properties. The characteristics of the polyamide layers formed thereon displayed different physicochemical properties. It is postulated that the support membrane chemistry actually affects the IP reaction and polyamide formation by controlling the amine diffusion speed as well as the breadth of the IP reaction zone (i.e., the region between the interface and the furthest point in which the reaction occurs). Transmission electron microscopy analyses further revealed the nanoscale differences in the polyamide layer (heights ranging from 50 to 200 nm), including intrinsic thickness of basal layer (~10–35 nm) and leaf-like top layer (~20–85 nm), as well as the presence of nanovoids. Finally, we propose a conceptual model to underline the role of support membrane chemistry in the IP reaction, and consequently the formation mechanism of the nanoscale polyamide features. The mechanistic insights from this study are expected to provide more understanding towards a better control over the fabrication of polyamide layers for TFC membranes. The findings in this work are also expected to facilitate tailoring polyamide layers for specific osmotically driven processes.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.language.isoenen_US
dc.relationPUB-1801-0010en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2021 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V.en_US
dc.subjectEngineering::Civil engineeringen_US
dc.titleUnraveling the role of support membrane chemistry and pore properties on the formation of thin-film composite polyamide membranesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.schoolSchool of Biological Sciencesen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.contributor.researchSingapore Membrane Technology Centreen_US
dc.identifier.doi10.1016/j.memsci.2021.119805-
dc.description.versionSubmitted/Accepted versionen_US
dc.identifier.scopus2-s2.0-85113871319-
dc.identifier.volume640en_US
dc.identifier.spage119805en_US
dc.subject.keywordsThin-Film Composite Membraneen_US
dc.subject.keywordsSupport Membrane Chemistryen_US
dc.description.acknowledgementThis research grant was supported by the Singapore National Research Foundation under its Urban Solutions & Sustainability Program and administered by PUB, Singapore’s National Water Agency (grant number: PUB-1801-0010). The Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University is grateful for the funding support from the Economic Development Board of Singapore.en_US
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