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dc.contributor.authorSu, Yu Pingen_US
dc.contributor.authorSim, Lee Nuangen_US
dc.contributor.authorLi, Xinen_US
dc.contributor.authorCoster, Hans G. L.en_US
dc.contributor.authorChong, Tzyy Hauren_US
dc.identifier.citationSu, Y. P., Sim, L. N., Li, X., Coster, H. G. L. & Chong, T. H. (2021). Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties. Journal of Membrane Science, 620(15), 118818-.
dc.description.abstractPiezoelectric membrane serves as an alternative to vibratory shear-enhanced process, which potentially offers lower cost of operation as the source of agitation is the membrane itself. The effect of morphology on dielectric and piezoelectric properties of polyvinylidene fluoride (PVDF) membranes prepared via non-solvent induced phase separation method was investigated. The membranes were fabricated using different solvents: N,N-dimethylformamide (PVDF-DMF), 1-methyl-2-pyrrolidinone (PVDF-NMP) and triethyl phosphate (PVDF-TEP). Dielectric strength analysis and piezo-response force microscopy (PFM) revealed that PVDF-DMF, displaying finger-like morphology, presented highest dielectric strength and desired piezoelectric properties. The presence of macrovoids in PVDF-NMP resulted in weak dielectric strength. Electrical poling was performed, enhancing the piezoelectric properties of membranes. No noticeable change in microstructure was observed for PVDF-NMP after poling. However, cross-section morphology of PVDF-DMF visibly changed from finger-like to drop-like cavities. Infrared (IR) spectroscopy and PFM showed improvements in fraction of β phase and piezoelectric coefficient d33 after poling. Cross-flow filtration experiments using colloidal silica were performed to investigate effect of electrical signal (10 Vpp, 500 Hz) on the membranes. It showed negligible effect on performance of unpoled PVDF-DMF, while 46% increase in critical flux and 66% reduction in transmembrane pressure increase (dTMP/dt) was observed for poled PVDF-DMF under electrical signal.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2020 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::Environmental engineeringen_US
dc.titleAnti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric propertiesen_US
dc.typeJournal Articleen
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.researchSingapore Membrane Technology Centreen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsPiezoelectric Membraneen_US
dc.subject.keywordsPolyvinylidene Fluorideen_US
dc.description.acknowledgementThe financial support of the Economic Development Board (EDB) of Singapore to the Singapore Membrane Technology Centre (SMTC), Nanyang Environment & Water Research Institute (NEWRI) is greatly appreciateden_US
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