Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 41: Nanostructured Materials IV
MM 41.2: Vortrag
Freitag, 31. März 2006, 12:45–13:00, IFW D
Analysis of phase contrast X-ray tomograms of nutshells: relating structure to properties — •Boris Breidenbach1, Adrian Sheppard2, Ulrike Wegst3, and Klaus Mecke1 — 1Institut für theoretische Physik I, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen — 2Applied Mathematics, Australian National University, Canberra, Australia — 3Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart
Physical quantities of a porous materials, like elasticity and conductivity, depend on its chemical as well as structural properties. To examine the influence of structural properties only, chemically identical materials can be studied. Some biological materials, like wood and nutshells, mainly consist of cellulose, but the size and shape of fibers and pores is very different, as was found using various imaging techniques. Here we present the results of a study of nutshell properties using phase contrast X-ray tomography.
We determined the structure of six types of nutshells at a resolution of 0.3 µm to resolve the microscopic pore space. Parallel implementations of anisotropic diffusion and a region growing algorithm have been used to segment the data (typical size of 20003 voxels). Subsequently, we calculated the porosity and two-point correlation functions of the structures. In order to compare them to numerically and experimentally measured elasticity tensors, we also determined the complete set of Minkowski tensors which are motion covariant and allow for a characterization of anisotropic pore spaces.