Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Nanoparticles and Composite Materials

CPP 8.48: Poster

Montag, 26. März 2012, 17:30–20:00, Poster A

Probing nanomechanical structure-property relationships of micro- and nanofibers by AFM bending experiments — Daniel Kluge, Andreas Fery, and •Johann Erath — Physikalische Chemie II, Universität Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany

Micro- and nanofibers are important structural elements in biomaterials and tissues, where one of their main functions is providing mechanical stability. Characterizing these small-scale fibers requires highly specialized techniques beyond standard methods for macroscopic materials. Nanoscale bending of the fibers is a common approach and applicable for a wide variety of fiber systems.

In our contribution, we focus on bending experiments of fibers suspended over channels: We show results on bending perpendicular and parallel to the substrate plane. We will discuss major advantages of these two bending modes, for example validation of boundary conditions, direct integration of optical methods and detailed investigation of the mechanical properties beyond linear elastic deformations.

Our experiments allow us to investigate the properties of numerous novel materials and we will present in detail our studies on supramolecular benzenetrisamide aggregates. Small changes in their molecular structure can significantly influence their morphology, which makes them suitable for "bottom-up" tailored materials. We look into the effect of the molecular structure on their mechanical behavior and compare benzenetrisamide whiskers and fibers obtained by different preparation methods.