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Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization

Reis, Rackel, Duke, Mikel C., Tardy, Blaise L., Oldfield, Daniel, Dagastine, Raymond R., Orbell, John D. and Dumée, Ludovic F. 2017, Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization, Scientific reports, vol. 7, pp. 1-10, doi: 10.1038/s41598-017-04900-5.

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Title Charge tunable thin-film composite membranes by gamma-ray triggered surface polymerization
Author(s) Reis, Rackel
Duke, Mikel C.
Tardy, Blaise L.
Oldfield, Daniel
Dagastine, Raymond R.
Orbell, John D.
Dumée, Ludovic F.ORCID iD for Dumée, Ludovic F. orcid.org/0000-0002-0264-4024
Journal name Scientific reports
Volume number 7
Article ID 4426
Start page 1
End page 10
Total pages 10
Publisher Nature
Place of publication London, Eng.
Publication date 2017-06
ISSN 2045-2322
Summary Thin-film composite poly(amide) (PA) membranes have greatly diversified water supplies and food products. However, users would benefit from a control of the electrostatic interactions between the liquid and the net surface charge interface in order to benefit wider application. The ionic selectivity of the 100 nm PA semi-permeable layer is significantly affected by the pH of the solution. In this work, for the first time, a convenient route is presented to configure the surface charge of PA membranes by gamma ray induced surface grafting. This rapid and up-scalable method offers a versatile route for surface grafting by adjusting the irradiation total dose and the monomer concentration. Specifically, thin coatings obtained at low irradiation doses between 1 and 10 kGy and at low monomer concentration of 1 v/v% in methanol/water (1:1) solutions, dramatically altered the net surface charge of the pristine membranes from -25 mV to +45 mV, whilst the isoelectric point of the materials shifted from pH 3 to pH 7. This modification resulted in an improved water flux by over 55%, from 45.9 to up 70 L.m-2.h-1, whilst NaCl rejection was found to drop by only 1% compared to pristine membranes.
Language eng
DOI 10.1038/s41598-017-04900-5
Field of Research 090404 Membrane and Separation Technologies
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2017, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30100999

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.