Regensburg 2016 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 66: Biomaterials and Biopolymers III (Joint Session BP/CPP/MM)
BP 66.4: Vortrag
Donnerstag, 10. März 2016, 15:45–16:00, H45
Studying Biomineralization with ultrathin silica sheets grown at the air-water interface. — •Helmut Lutz1, Vance Jaeger2, Rüdiger Berger1, Mischa Bonn1, Jim Pfaendtner2, and Tobias Weidner1 — 1Max Planck Institute for Polymer Research Ackermannweg 10, Mainz 55128, Germany — 2Chemical Engineering University of Washington 105 Benson Hall, Seattle, WA 98195-1750, USA
Inspired by diatom silification we used amphiphilic peptides consisting of leucine and lysine (LK peptides) to investigate biomineralization at surfaces. Depending on hydrophobic periodicity, these peptides adopt alpha helical or beta sheet structures at the air-water interface. Upon addition of a silica precursor we obtained surface-tailored peptide-silica hybrid films with a thickness of ~4 nm. We probed film composition and interactions between peptides and silica at early stages of biomineralization by means of surface sensitive techniques, such as sum frequency generation (SFG) and X-ray photoelectron spectroscopy (XPS). Electron and atomic force microscopy show similarities of the film fine structure and the surface of in-solution silica precipitates. Experimental findings were complemented with molecular dynamics simulations. We believe that our results provide insights into the biomineralization of structured films, which might prove useful in materials design and surface engineering.
H. Lutz, V. Jaeger, R. Berger, M. Bonn, J. Pfaendtner, T. Weidner, Advanced Materials Interfaces 2015, 2, n/a. J. E. Baio, A. Zane, V. Jaeger, A. M. Roehrich, H. Lutz, J. Pfaendtner, G. P. Drobny, T. Weidner, Journal of the American Chemical Society 2014, 136, 15134.