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AuthorOsicka, Josef
AuthorIlcikova, Marketa
AuthorPopelka, Anton
AuthorFilip, Jaroslav
AuthorBertok, Tomas
AuthorTkac, Jan
AuthorKasak, Peter
Available date2021-09-01T10:03:28Z
Publication Date2016
Publication NameLangmuir
ResourceScopus
URIhttp://dx.doi.org/10.1021/acs.langmuir.6b01084
URIhttp://hdl.handle.net/10576/22456
AbstractA simple fabrication method for preparation of surfaces able to switch from superhydrophobic to superhydrophilic state in a reversible and fast way is described. A self-assembled monolayer (SAM) consisting of quaternary ammonium group with aliphatic tail bearing terminal thiol functionality was created on gold nano/microstructured and gold planar surfaces, respectively. A rough nano/microstructured surface was prepared by galvanic reaction on a silicon wafer. The reversible counterion exchange on the rough surface resulted in a switchable contact angle between <5° and 151°. The prewetted rough surface with Cl– as a counterion possesses a superoleophobic underwater character. The kinetics of counterion exchanges suggests a long hydration process and strong electron ion pairing between quaternary ammonium group and perfluorooctanoate counterion. Moreover, a wettability gradient from superhydrophobic to superhydrophilic can be formed on the modified rough gold surface in a robust and simple way by passive incubation of the substrate in a counterion solution and controlled by ionic strength. Furthermore, adsorption of gold nanoparticles to modified plain gold surface can be controlled to a high extent by counterions present on the SAM layer.
Languageen
PublisherAmerican Chemical Society
SubjectGold
Gold metallurgy
Hydrophilicity
Hydrophobicity
Ion exchange
Ionic strength
Monolayers
Self assembled monolayers
Silicon wafers
Surface measurement
Counterion exchanges
Fabrication method
Gold Nanoparticles
Hydration process
Perfluorooctanoate
Quaternary ammonium group
Super-hydrophilic
Wettability gradients
Ions
TitleSimple, Reversible, and Fast Modulation in Superwettability, Gradient, and Adsorption by Counterion Exchange on Self-Assembled Monolayer
TypeArticle
Pagination5491-5499
Issue Number22
Volume Number32
dc.accessType Abstract Only


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