TY - JOUR
T1 - Ion-specific oil repellency of polyelectrolyte multilayers in water
T2 - Molecular insights into the hydrophilicity of charged surfaces
AU - Liu, Xiaokong
AU - Leng, Chuan
AU - Yu, Li
AU - He, Ke
AU - Brown, Lauren Joan
AU - Chen, Zhan
AU - Cho, Jinhan
AU - Wang, Dayang
PY - 2015/4/13
Y1 - 2015/4/13
N2 - 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.
AB - 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.
KW - interfaces
KW - oil-water separation
KW - photoelectronspectroscopy
KW - structure elucidation
KW - surface chemistry
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U2 - 10.1002/anie.201411992
DO - 10.1002/anie.201411992
M3 - Article
C2 - 25703598
AN - SCOPUS:84926453510
VL - 54
SP - 4851
EP - 4856
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
SN - 1433-7851
IS - 16
ER -