Authors
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Tavana, H. ; Yang, G. ; Yip, C.M. ; Appelhans, D. ; Zschoche, St. ; Grundke, K. ; Hair, M.L. ; Neumann, A. W.
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Title
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Stick-Slip of the Three-Phase Line in Measurements of Dynamic Contact Angles
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Date
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09.03.2006
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Number
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13766
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Abstract
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Contact angles of a series of <I>n</I>-alkanes (i.e., <I>n</I>-heptane to <I>n</I>-hexadecane) are studied on two functionalized maleimidecopolymers (i.e., poly(ethene-<I>alt</I>-<I>N</I>-(4-(perfluoroheptylcarbonyl)aminobutyl)maleimide) (ETMF) and poly(octadecene-<I>alt</I>-<I>N</I>-(4-(perfluoroheptylcarbonyl)aminobutyl)maleimide) (ODMF)). On the homogeneous ETMF films, all liquidsshow a smooth motion of the three-phase line. In contrast, on ODMF surfaces that are found to consist of mainlyfluorocarbons and small patches of hydrocarbons, short-chain <I>n</I>-alkanes show a stick-slip pattern. By increasing thechain length of the probe liquids, stick-slip is reduced significantly. The phenomenon is discussed in the frameworkof the Cassie equation. It is found that the upper limit of contact angles in the stick-slip pattern is given by theadvancing angle that would be obtained on the pure fluorocarbon surface, whereas the lower limit of the stick-slippattern is given by the Cassie angle.
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Publisher
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Langmuir
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Wikidata
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Citation
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Langmuir 22 (2006) 628-636
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DOI
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https://doi.org/10.1021/la051715o
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Tags
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