Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 64: Nanomaterials - Miscellaneous
MM 64.5: Vortrag
Donnerstag, 14. März 2013, 18:15–18:30, H25
Nanomechanical characterization of soft matter fibers — •Daniel Kluge1, Julia Singer2, Hans-Werner Schmidt2, and Andreas Fery1 — 1Physical Chemistry II, University of Bayreuth, Germany — 2Macromolecular Chemistry I, University of Bayreuth, Germany
Micro- and nanofibers are important structural elements in many functional materials. Their characterization requires highly advanced techniques beyond standard methods for macroscopic materials. In our contribution, we focus on nanoscale bending of free-standing fibers, which is suitable for a wide variety of fiber systems. We discuss major advantages of bending perpendicular and parallel to the substrate plane, especially the detailed investigation of the mechanical properties within and beyond linear elastic deformations. For the interpretation of the data, we use analytical as well as finite element models. In particular, we investigate supramolecular 1,3,5-Benzenetrisamides (BTAs), which allow combining the advantages of bottom-up and top-down techniques since they form well-defined fibers by self-assembly and melt electrospinning. We show that the morphology of self-assembled BTA fibers can be tailored via the substituents, establish mechanical structure-property relations and distinguish between size and material contributions. Furthermore, we compare self-assembled and electrospun fibers from the same BTAs and demonstrate that regardless of the preparation pathway, the fibers possess a remarkable mechanical stiffness. This is a striking result, since only supramolecular interactions and no covalent bonds are present in these systems.