Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.8: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Mechanical Characterization of single sub-micron Diameter Fibers via AFM — •Benedikt Neugirg1, Daniel Kluge1, Julia Singer2, Hans-Werner Schmidt2, and Andreas Fery1 — 1Department of Physical Chemistry II, University of Bayreuth, 95440 Bayreuth, Germany — 2Department of Macromolecular Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
Many biological and artificial materials are composites with sub-micron diameter fibers as principal building unit. Mechanical characterization on the single fiber level requires advanced probing techniques beyond the standard methods. We utilize the AFM to do nanoscale bending which is applicable to a wide variety of systems. Generally, fibers are deposited on structured glass substrates and investigated in a combined AFM/optical microscope setup. In our contribution we will show results of fiber bending perpendicular and parallel to the substrate plane. We will discuss the advantages of these two bending modes, for example validation of boundary conditions, direct integration of optical methods and the detailed investigation of the mechanical properties beyond linear elastic deformations. Our study focuses on supramolecular fibrillar assemblies of benzenetrisamides. Although the main intermolecular interaction are hydrogen bonds (in contrast to covalent bonds in classical polymers), these structures show Young's moduli in the GPa range. By varying the molecular structure, stiffness and fiber diameter can be tailored. Besides self-assembly, electrospinning is a complementary preparation route which makes the material accessible via a "Top-down" as well as a "Bottom-up" approach.