Amine enrichment of thin-film composite membranes via low pressure plasma polymerization for antimicrobial adhesion

Reis, Rackel, Dumée, Ludovic F., He, Li, She, Fenghua, Orbell, John D., Winther-Jensen, Bjorn and Duke, Mikel C. 2015, Amine enrichment of thin-film composite membranes via low pressure plasma polymerization for antimicrobial adhesion, ACS Applied materials and interfaces, vol. 7, no. 27, pp. 14644-14653, doi: 10.1021/acsami.5b01603.

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Title Amine enrichment of thin-film composite membranes via low pressure plasma polymerization for antimicrobial adhesion
Author(s) Reis, Rackel
Dumée, Ludovic F.ORCID iD for Dumée, Ludovic F.
He, Li
She, FenghuaORCID iD for She, Fenghua
Orbell, John D.
Winther-Jensen, Bjorn
Duke, Mikel C.
Journal name ACS Applied materials and interfaces
Volume number 7
Issue number 27
Start page 14644
End page 14653
Total pages 10
Publisher American Chemical Society
Place of publication Washington, D.C
Publication date 2015
ISSN 1944-8252
Keyword(s) amine enrichment
antimicrobial properties
functional thin-film coatings
nanoscale surface engineering
plasma polymerization
Summary Thin-film composite membranes, primarily based on poly(amide) (PA) semipermeable materials, are nowadays the dominant technology used in pressure driven water desalination systems. Despite offering superior water permeation and salt selectivity, their surface properties, such as their charge and roughness, cannot be extensively tuned due to the intrinsic fabrication process of the membranes by interfacial polymerization. The alteration of these properties would lead to a better control of the materials surface zeta potential, which is critical to finely tune selectivity and enhance the membrane materials stability when exposed to complex industrial waste streams. Low pressure plasma was employed to introduce amine functionalities onto the PA surface of commercially available thin-film composite (TFC) membranes. Morphological changes after plasma polymerization were analyzed by SEM and AFM, and average surface roughness decreased by 29%. Amine enrichment provided isoelectric point changes from pH 3.7 to 5.2 for 5 to 15 min of plasma polymerization time. Synchrotron FTIR mappings of the amine-modified surface indicated the addition of a discrete 60 nm film to the PA layer. Furthermore, metal affinity was confirmed by the enhanced binding of silver to the modified surface, supported by an increased antimicrobial functionality with demonstrable elimination of E. coli growth. Essential salt rejection was shown minimally compromised for faster polymerization processes. Plasma polymerization is therefore a viable route to producing functional amine enriched thin-film composite PA membrane surfaces.
Language eng
DOI 10.1021/acsami.5b01603
Field of Research 030108 Separation Science
Socio Economic Objective 869999 Manufacturing not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, American Chemical Society
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