Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties

Piezoelectric 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 pre...

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Main Authors: Su, Yu Ping, Sim, Lee Nuang, Li, Xin, Coster, Hans G. L., Chong, Tzyy Haur
Other Authors: Interdisciplinary Graduate School (IGS)
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/152793
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1527932021-10-09T20:11:13Z Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties Su, Yu Ping Sim, Lee Nuang Li, Xin Coster, Hans G. L. Chong, Tzyy Haur Interdisciplinary Graduate School (IGS) School of Civil and Environmental Engineering Singapore Membrane Technology Centre Nanyang Environment and Water Research Institute Engineering::Environmental engineering Piezoelectric Membrane Polyvinylidene Fluoride Piezoelectric 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. Economic Development Board (EDB) Accepted version The 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 appreciated 2021-10-01T04:43:58Z 2021-10-01T04:43:58Z 2021 Journal Article Su, 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-. https://dx.doi.org/10.1016/j.memsci.2020.118818 0376-7388 https://hdl.handle.net/10356/152793 10.1016/j.memsci.2020.118818 15 620 118818 en Journal of Membrane Science © 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. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Environmental engineering
Piezoelectric Membrane
Polyvinylidene Fluoride
spellingShingle Engineering::Environmental engineering
Piezoelectric Membrane
Polyvinylidene Fluoride
Su, Yu Ping
Sim, Lee Nuang
Li, Xin
Coster, Hans G. L.
Chong, Tzyy Haur
Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties
description Piezoelectric 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.
author2 Interdisciplinary Graduate School (IGS)
author_facet Interdisciplinary Graduate School (IGS)
Su, Yu Ping
Sim, Lee Nuang
Li, Xin
Coster, Hans G. L.
Chong, Tzyy Haur
format Article
author Su, Yu Ping
Sim, Lee Nuang
Li, Xin
Coster, Hans G. L.
Chong, Tzyy Haur
author_sort Su, Yu Ping
title Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties
title_short Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties
title_full Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties
title_fullStr Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties
title_full_unstemmed Anti-fouling piezoelectric PVDF membrane : effect of morphology on dielectric and piezoelectric properties
title_sort anti-fouling piezoelectric pvdf membrane : effect of morphology on dielectric and piezoelectric properties
publishDate 2021
url https://hdl.handle.net/10356/152793
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