Berlin 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Poster I
CPP 15.3: Poster
Monday, March 18, 2024, 18:00–20:00, Poster C
Partially wetted PNiPAAm brushes responses to different atmospheres — •Simon Schubotz1,2, Petra Uhlmann1, Andreas Fery1,2, Jens-Uwe Sommer1,2, and Günter K. Auernhammer1 — 1Leibniz-Institut für Polymerforschung Dresden e.V., 01069 Dresden, Germany — 2Technische Universität Dresden, 01069 Dresden, Germany
In our study, we focused on the partial wetting of co-nonsolvent polymer brushes and the dynamics of a three-phase contact line moving over such brushes. We performed wetting experiments in different atmospheres and used an ellipsometer to measure the brush's thickness to understand the impact of the atmosphere on the brush. Our findings show that PNiPAAm brushes exhibit a memory effect when depositing drops consecutively at the same position. The subsequent drops adapt the brush and change the drop's wetting behavior. In further wetting experiments, we measured water drops in an ethanol-saturated atmosphere on PNiPAAm brushes. The measurements show that an ethanol-enriched atmosphere strongly affects the memory effect reversibly. We present strategies to counter the mixing between the atmosphere and the drop.
[1] Schubotz, S., et al., Memory effects in polymer brushes showing co-nonsolvency effects. Advances in Colloid and Interface Science, 2021. 294: p. 102442.
[2] Schubotz, S., et al., Influence of the Atmosphere on the Wettability of Polymer Brushes. Langmuir 2023, 39, 14, 4872-4880