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Adaptation of a Styrene–Acrylic Acid Copolymer Surface to Water

Li, Xiaomei ; Silge, Simon ; Saal, Alexander ; Kircher, Gunnar ; Koynov, Kaloian ; Berger, Rüdiger ; Butt, Hans-Jürgen (2021)
Adaptation of a Styrene–Acrylic Acid Copolymer Surface to Water.
In: Langmuir, 37 (4)
doi: 10.1021/acs.langmuir.0c03226
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Solid surfaces, in particular polymer surfaces, are able to adapt upon contact with a liquid. Adaptation results in an increase in contact angle hysteresis and influences the mobility of sliding drops on surfaces. To study adaptation and its kinetics, we synthesized a random copolymer composed of styrene and 11–25 mol% acrylic acid (PS/PAA). We measured the dynamic advancing (θA) and receding (θR) contact angles of water drops sliding down a tilted plate coated with this polymer. We measured θA ≈ 87° for velocities of the contact line <20 μm/s. At higher velocities, θA gradually increased to ∼98°. This value is similar to θA of a pure polystyrene (PS) film, which we studied for comparison. We associate the gradual increase in θA to the adaptation process to water: The presence of water leads to swelling and/or an enrichment of acid groups at the water/polymer interface. By applying the latest adaptation theory (Butt et al. Langmuir 2018, 34, 11292), we estimated the time constant of this adaptation process to be ≪1 s. For sliding water drops, θR is ∼10° lower compared to the reference PS surface for all tested velocities. Thus, at the receding side of a sliding drop, the surface is already enriched by acid groups. For a water drop with a width of 5 mm, the increase in contact angle hysteresis corresponds to an increase in capillary force in the range of 45–60 μN, depending on sliding velocity.

Typ des Eintrags: Artikel
Erschienen: 2021
Autor(en): Li, Xiaomei ; Silge, Simon ; Saal, Alexander ; Kircher, Gunnar ; Koynov, Kaloian ; Berger, Rüdiger ; Butt, Hans-Jürgen
Art des Eintrags: Bibliographie
Titel: Adaptation of a Styrene–Acrylic Acid Copolymer Surface to Water
Sprache: Englisch
Publikationsjahr: 13 Januar 2021
Ort: Washington, DC
Verlag: ACS Publications
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Langmuir
Jahrgang/Volume einer Zeitschrift: 37
(Heft-)Nummer: 4
DOI: 10.1021/acs.langmuir.0c03226
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Kurzbeschreibung (Abstract):

Solid surfaces, in particular polymer surfaces, are able to adapt upon contact with a liquid. Adaptation results in an increase in contact angle hysteresis and influences the mobility of sliding drops on surfaces. To study adaptation and its kinetics, we synthesized a random copolymer composed of styrene and 11–25 mol% acrylic acid (PS/PAA). We measured the dynamic advancing (θA) and receding (θR) contact angles of water drops sliding down a tilted plate coated with this polymer. We measured θA ≈ 87° for velocities of the contact line <20 μm/s. At higher velocities, θA gradually increased to ∼98°. This value is similar to θA of a pure polystyrene (PS) film, which we studied for comparison. We associate the gradual increase in θA to the adaptation process to water: The presence of water leads to swelling and/or an enrichment of acid groups at the water/polymer interface. By applying the latest adaptation theory (Butt et al. Langmuir 2018, 34, 11292), we estimated the time constant of this adaptation process to be ≪1 s. For sliding water drops, θR is ∼10° lower compared to the reference PS surface for all tested velocities. Thus, at the receding side of a sliding drop, the surface is already enriched by acid groups. For a water drop with a width of 5 mm, the increase in contact angle hysteresis corresponds to an increase in capillary force in the range of 45–60 μN, depending on sliding velocity.

Freie Schlagworte: SFB1194_C07
Fachbereich(e)/-gebiet(e): DFG-Sonderforschungsbereiche (inkl. Transregio)
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen > Projektbereich C: Neue und verbesserte Anwendungen
Hinterlegungsdatum: 11 Mär 2021 08:25
Letzte Änderung: 07 Dez 2023 12:19
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