Ion‐Specific Oil Repellency of Polyelectrolyte Multilayers in Water: Molecular Insights into the Hydrophilicity of Charged Surfaces
dc.contributor.author | Liu, Xiaokong | en_US |
dc.contributor.author | Leng, Chuan | en_US |
dc.contributor.author | Yu, Li | en_US |
dc.contributor.author | He, Ke | en_US |
dc.contributor.author | Brown, Lauren Joan | en_US |
dc.contributor.author | Chen, Zhan | en_US |
dc.contributor.author | Cho, Jinhan | en_US |
dc.contributor.author | Wang, Dayang | en_US |
dc.date.accessioned | 2015-05-04T20:37:17Z | |
dc.date.available | 2016-05-10T20:26:29Z | en |
dc.date.issued | 2015-04-13 | en_US |
dc.identifier.citation | Liu, Xiaokong; Leng, Chuan; Yu, Li; He, Ke; Brown, Lauren Joan; Chen, Zhan; Cho, Jinhan; Wang, Dayang (2015). "Ion‐Specific Oil Repellency of Polyelectrolyte Multilayers in Water: Molecular Insights into the Hydrophilicity of Charged Surfaces." Angewandte Chemie International Edition 54(16): 4851-4856. | en_US |
dc.identifier.issn | 1433-7851 | en_US |
dc.identifier.issn | 1521-3773 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/111271 | |
dc.description.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.Wet surfaces: Liquid wetting on charged surfaces is well correlated with the molecular nature of surface ionic groups. The orientation change of surface ionic groups either hardly affects water wetting if their configuration is isotropic, or markedly transforms poor water wetting in oil to poor water de‐wetting in water if their configuration is anisotropic, thus leading to excellent underwater oil repellency. | en_US |
dc.publisher | WILEY‐VCH Verlag | en_US |
dc.subject.other | photoelectronspectroscopy | en_US |
dc.subject.other | structure elucidation | en_US |
dc.subject.other | surface chemistry | en_US |
dc.subject.other | oil‐water separation | en_US |
dc.subject.other | interfaces | en_US |
dc.title | Ion‐Specific Oil Repellency of Polyelectrolyte Multilayers in Water: Molecular Insights into the Hydrophilicity of Charged Surfaces | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Chemistry | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Chemistry, University of Michigan, Ann Arbor, MI 48109 (USA) | en_US |
dc.contributor.affiliationother | Department of Chemical and Biological Engineering, Korea University, Seoul, 136–701 (Korea) | en_US |
dc.contributor.affiliationother | Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095 (Australia) | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/111271/1/anie_201411992_sm_miscellaneous_information.pdf | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/111271/2/4851_ftp.pdf | |
dc.identifier.doi | 10.1002/anie.201411992 | en_US |
dc.identifier.source | Angewandte Chemie International Edition | en_US |
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dc.identifier.citedreference | Note that (PDDA/PSS) 5.5 and (PDDA/PSS) 6.0 were produced by LbL deposition in 0.50 M NaCl, (PDDA/PSS) 9.5 and (PDDA/PSS) 10.0 PEMs in 0.25 M NaCl and (PDDA/PSS) 14.5 and (PDDA/PSS) 15.0 PEMs in 0.10 M NaCl, the thickness and surface roughness of which were comparable to that of (PDDA/PSS) 3.5 and (PDDA/PSS) 4.0 PEMs. | en_US |
dc.identifier.citedreference | Note that using the experimental θ w/a value (52°) of the (PDDA/PSS) 4 PEMs obtained after 72 hours of aging at 60 °C, the θ o/w and θ w/o values were calculated at 112° and 68°, respectively, by using Equations (1) and (2), and they were still significantly smaller than experimental values. | en_US |
dc.identifier.citedreference | Note that the CH 2 moieties of the PDDA backbone should have a small contribution to the CH 2 stretching vibration signal as they may be either shielded by the pyrrolidine ring of the QA + groups or randomly oriented within the surface plane (Figure 4). | en_US |
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dc.identifier.citedreference | The use of different electrolyte and polyelectrolytes for LbL deposition can yield PEMs with different surface morphology, surface charge, and internal structure (Ref [15]). To avoid that technical issue, new electrolytes and polyelelytrolytes were used only for growth of the outmost layers rather than the entire PEMs. (PDDA/PSS) 3.0 and (PDDA/PSS) 3.5 PEMs, obtained in 1.0 M NaCl, were used for deposition of polycations and polyanions in 1.0 M salt, respectively, so the resulting PEMs should be comparable to (PDDA/PSS) 3.5 and (PDDA/PSS) 4.0 PEMs obtained in 1.0 M NaCl in terms of the film thickness and surface morphology and charge. | en_US |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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