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Visualizing and Quantifying Nanoscale Hydrophobicity and Chemical Distribution of Surface Modified Polyethersulfone (PES) Membranes

Abstract

Chemical modifications bring unique properties into polymeric membranes that may have enhanced filtration or separation efficiencies, antifouling, antimicrobial activity and selectivity. However, there is a lack of nanoscale characterization of chemical additive distribution and impacts of chemical modifiers or additives on membrane surface properties, especially those at nanoscale. In this study, a series of industrially relevant polyethersulfone (PES) membranes modified with poly (ethylene glycol) (PEG) and polyvinylpyrrolidone (PVP) were analysed systematically. Particularly, hydrophobicity and chemical distribution were scrutinized by atomic force microscopy (AFM) and AFM coupled with infrared analysis capability (AFM-IR) for the first time that successfully resolved nanoscale structural and chemical properties of the chemically modified PES membranes. Our results indicated the heterogeneous spatial distribution of PVP and PEG based on their characteristics IR bands and the resulting hydrophobicity distribution on modified membrane surfaces at nanoscale. Particularly, we established a linear correlation (R2=0.994) between the measured adhesion force and water contact angles, which enabled the examination of local surface hydrophobicity. The PES membranes became more hydrophilic with the increasing blend of PVP and PEG. With AFM-IR, trace amounts (1-4%) of PVP could be identified sensitively on PES membranes based on their unique characteristic IR bands, which were not achieved by FTIR or IR mapping. Overall, these novel characterization approaches hold paramount importance for the design and quality control of polymer membrane modification and manufacturing.

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Supplementary files

Publication details

The article was received on 26 May 2017, accepted on 14 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR03772D
Citation: Nanoscale, 2017, Accepted Manuscript
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    Visualizing and Quantifying Nanoscale Hydrophobicity and Chemical Distribution of Surface Modified Polyethersulfone (PES) Membranes

    W. FU, C. Carbrello, X. Wu and W. Zhang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03772D

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