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8.–10. Nov. 2021
University of Freiburg
Europe/Berlin Zeitzone

Switchable and Adjustable Fluid Transport and Wetting Properties in Polypyrrol-Silicon and Ceramic-based Inverse Opal Structures

09.11.2021, 11:25
20m
Aula, Kollegiengebäude I (University of Freiburg)

Aula, Kollegiengebäude I

University of Freiburg

Platz der Universität 3, 79098 Freiburg

Sprecher

Laura Gallardo Domínguez (Hamburg University of Technology)

Beschreibung

Substrates with switchable or adjustable wetting properties are desirable for actuators, coatings, filters or biomedical applications. In this work we present a study of two different substrates. Firstly, the possibilities of an electrically conductive polymer, i.e., polypyrrol in combination with porous silicon are explored, where previous studies already showed how an electric field can influence the chemo-mechanical properties of the polymer [1, 2] and the Young contact angle [3]. Secondly, we analyze the wetting and fluid transport properties of an alumina inverse opal structure (Al2O3), which undergoes a spontaneous transition under ambient condition to a more hydrophobic state in time. This transition can be reversed by a low temperature heat treatment. While, a high-temperature heat treatment irreversibly change the porous network structure [4], the low-temperature treatment preserves the inverse opal original structure.

[1] Kaneto, K., Sonoda, Y., & Takashima, W. (2000). Direct measurement and mechanism of electro-chemomechanical expansion and contraction in polypyrrole films. Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 39(10), 5918–5922.
[2] Brinker, M., Dittrich, G., Richert, C., Lakner, P., Krekeler, T., Keller, T. F., ... & Huber, P. (2020). Giant electrochemical actuation in a nanoporous silicon-polypyrrole hybrid material. Science advances, 6(40), eaba1483.
[3] Chang, J. H., & Hunter, I. W. (2011). A superhydrophobic to superhydrophilic in situ wettability switch of microstructured polypyrrole surfaces. Macromolecular Rapid Communications, 32(9–10), 718–723.
[4] Furlan, K. P., Pasquarelli, R. M., Krekeler, T., Ritter, M., Zierold, R., Nielsch, K., Schneider, G. A., & Janssen, R. (2017). Highly porous α-Al2O3 ceramics obtained by sintering atomic layer deposited inverse opals. Ceramics International, 43(14), 11260–11264.

Hauptautor

Laura Gallardo Domínguez (Hamburg University of Technology)

Co-Autoren

Kaline Furlan (Institute of Advanced Ceramics, Integrated Materials Processing Group, Hamburg University of Technology) Manuel Brinker (Institute of Materials Physics and Technology, Hamburg University of Technology) Patrick Huber (Center for Hybrid Nanostructures CHyN, Hamburg University; Institute of Materials Physics and Technology, Hamburg University of Technology)

Präsentationsmaterialien

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