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- Title
Ion-Specific Oil Repellency of Polyelectrolyte Multilayers in Water: Molecular Insights into the Hydrophilicity of Charged Surfaces.
- Authors
Liu, Xiaokong; Leng, Chuan; Yu, Li; He, Ke; Brown, Lauren Joan; Chen, Zhan; Cho, Jinhan; Wang, Dayang
- 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.
- Subjects
POLYELECTROLYTES; WATER; X-ray photoelectron spectroscopy; FLUX (Energy); OIL-water interfaces
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 16, p4933
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201411992