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Title

Electrowetting of Weak Polyelectrolyte-Coated Surfaces

AuthorsSénéchal, V.; Saadaoui, H.; Rodríguez-Hernández, Juan ; Drummond, C.
Issue Date2017
PublisherAmerican Chemical Society
CitationLangmuir : the ACS journal of surfaces and colloids 33: 4996-5005 (2017)
AbstractPolymer coatings are commonly used to modify interfacial properties like wettability, lubrication, or biocompatibility. These properties are determined by the conformation of polymer molecules at the interface. Polyelectrolytes are convenient elementary bricks to build smart materials, given that polyion chain conformation is very sensitive to different environmental variables. Here we discuss the effect of an applied electric field on the properties of surfaces coated with poly(acrylic acid) brushes. By combining atomic force microscopy, quartz crystal microbalance, and contact angle experiments, we show that it is possible to precisely tune polyion chain conformation, surface adhesion, and surface wettability using very low applied voltages if the polymer grafting density and environmental conditions (pH and ionic strength) are properly formulated. Our results indicate that the effective ionization degree of the grafted weak polyacid can be finely controlled with the externally applied field, with important consequences for the macroscopic surface properties.
DescriptionThe Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.langmuir. 7b00473. Figures S1−S3 (PDF)
Publisher version (URL)http://dx.doi.org/10.1021/acs.langmuir.7b00473
URIhttp://hdl.handle.net/10261/154953
DOI10.1021/acs.langmuir.7b00473
Identifiersdoi: 10.1021/acs.langmuir.7b00473
issn: 0743-7463
e-issn: 1520-5827
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