Ion-specific oil repellency of polyelectrolyte multilayers in water: molecular insights into the hydrophilicity of charged surfaces
Date
2015
Authors
Liu, X.
Leng, C.
Yu, L.
He, K.
Brown, L.J.
Chen, Z.
Cho, J.
Wang, D.
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Journal article
Citation
Angewandte Chemie International Edition, 2015; 54(16):4851-4856
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Abstract
Surface wetting on polyelectrolyte multilayers (PEMs), prepared by alternating deposition of polydiallyldimethylammonium chloride (PDDA) and poly(styrene sulfonate) (PSS), was investigated mainly in water-solid-oil systems. The surface-wetting behavior of as-prepared PEMs was well correlated to the molecular structures of the uncompensated ionic groups on the PEMs as revealed by sum frequency generation vibrational and X-ray photoelectron spectroscopies. The orientation change of the benzenesulfonate groups on the PSS-capped surfaces causes poor water wetting in oil or air and negligible oil wetting in water, while the orientation change of the quaternized pyrrolidine rings on the PDDA-capped surfaces hardly affects their wetting behavior. The underwater oil repellency of PSS-capped PEMs was successfully harnessed to manufacture highly efficient filters for oil-water separation at high flux.
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Link to a related website: http://deepblue.lib.umich.edu/bitstream/2027.42/111215/2/4933_ftp.pdf, Open Access via Unpaywall
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Copyright 2015 Wiley-VCH Verlag GmbH