Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 40: Nanomaterials II: Mechanical Properties
MM 40.7: Vortrag
Mittwoch, 18. März 2015, 17:30–17:45, H 0107
Synthesis and Properties of Solids Composed of Organic-Linked Nanoparticles — •Axel Dreyer1, Artur Feld2, Ezgi D. Yilmaz1, Wolfgang Heckel1, Stefan Müller1, Horst Weller2, and Gerold A. Schneider1 — 1Hamburg University of Technology, Institute Advanced Ceramics, Hamburg, Germany — 2Hamburg University, Institute of Physical Chemistry, Hamburg, Germany
Natural hard tissues like nacre or enamel are characterized by outstanding mechanical properties in relation to their rather weak mechanical constituents. They key of their mechanical behavior is the combination of hard inorganic and soft organic constituents in a hierarchical structure, which starts on the nanoscale. Our approach is an attempt to synthesize the first hierarchical level by the self-organization of organic-coated nanoparticles into close-packed superstructures. The organic molecules play a prominent role by providing cohesion in the material via strong coordinated binding of functional groups to the inorganic particles as well as weak van der Waals binding between adjacent molecules. We present the successful manufacturing of extensive nano-particle superstructures by a sequence of sedimentation, drying, heating, and pressing of monodispersed spherical iron oxide particles. In a subsequent step we will increase the interparticle binding energy by controlled chemical crosslinking within the organic shell of the solid particle superstructures. The mechanical properties of these nano-composites like hardness, elastic modulus, and strength will be discussed and related to the binding energy in the interparticle space.