Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 37: Biomaterials and Biological Materials II
MM 37.2: Vortrag
Mittwoch, 18. März 2015, 12:00–12:15, TC 006
Moisture driven actuation of silica structures replicated from pine cone scales — •Gerhard Fritz-Popovski1, Daniel Van Opdenbosch2, Roland Morak1, Oskar Paris1, and Cordt Zollfrank2 — 1Institute of Physics, Montanuniversitaet Leoben Franz-Josef-Str. 18, 8700 Leoben, Austria — 2Fachgebiet Biogene Polymere, Technische Universität München am Wissenschaftszentrum Straubing Schulgasse 16, D-94315 Straubing, Germany
The actuation behavior of silica structures that were based on the templates of pine cones was investigated. The silica structure replicated all structures from the macroscopic level down to the level of microfibrils (diameter 10-20 nm). While the movement of native pine cones is based of different swelling of the fibrous materials in fiber direction and normal to it the biotemplated silica material contains no fibers but pores. Nevertheless, the inorganic material shows similar moisture dependent movements as the biological one. This can be explained by different elastic deformation of the pores along and normal to the axis during vapor condensation.