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DY: Fachverband Dynamik und Statistische Physik

DY 36: Focus Session: Wetting on Adaptive Substrates I (joint session CPP/DY/O)

DY 36.2: Talk

Thursday, March 21, 2024, 10:00–10:15, H 0107

Volatile binary mixtures on polymer brushes — •Jan Diekmann und Uwe Thiele — Institut für Theoretische Physik, Universität Münster, 48149 Münster, Germany

We present a mesoscopic thin-film model in gradient dynamics form for binary liquid mixtures on brush-covered substrates incorporating volatility in a narrow gap. Thereby, we expand models established in [1, 4-6] by incorporating two substances present in each of three bulk phases - liquid, brush and gas. We discuss the different contributions to the free energy, thereby employing Flory-Huggins theory of mixing for the condensed phases and assuming ideal gases for the vapor phase. Interface energies are modeled as linear interpolations of known limiting cases. The resulting six-field model is then analyzed with numerical time simulations showing results with a focus on lateral concentration gradients, notably at the contact line.

[1] S. Hartmann, C. Diddens, M. Jalaal, and U. Thiele. JFM 960, 2023. doi: 10.1017/jfm.2023.176. [2] S. Hartmann, J. Diekmann, D. Greve, and U. Thiele. 2023. doi: 10.48550/ARXIV.2311.07307. [3] S. Schubotz, Q. A. Besford, S. Nazari, P. Uhlmann, E. Bittrich, J.-U. Sommer, and G. K. Auernhammer. Langmuir, 39, 2023. doi: 10.1021/acs.langmuir.2c03009. [4] L. A. Smook, G. C. R. van Eck, and S. de Beer. Macromolecules, 53, 2020. doi: 10.1021/acs.macromol.0c02228. [5] U. Thiele and S. Hartmann. EPJ-ST 229, 2020. doi:10.1140/epjst/e2020-900231-2. [6] Özlem Kap, S. Hartmann, H. Hoek, S. de Beer, I. Siretanu, U. Thiele, and F. Mugele. JFM 158, 2023. doi: 10.1063/5.0146779.

Keywords: polymer brush; thin-film dynamics