A5026361770- Advancements in Solid Oxide Fuel Cells
- Concrete and Cement Materials Research
- Electronic and Structural Properties of Oxides
- Fuel Cells and Related Materials
- Hydrocarbon exploration and reservoir analysis
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Corrosion Behavior and Inhibition
- Soil and Unsaturated Flow
- Building materials and conservation
- Enhanced Oil Recovery Techniques
- Electrocatalysts for Energy Conversion
- Innovative concrete reinforcement materials
- Composite Material Mechanics
- Geochemistry and Geologic Mapping
- Electron and X-Ray Spectroscopy Techniques
- Geological and Geochemical Analysis
- Semiconductor materials and devices
- Groundwater flow and contamination studies
- CO2 Sequestration and Geologic Interactions
- Mineral Processing and Grinding
- Magnetic and transport properties of perovskites and related materials
- Advanced ceramic materials synthesis
- Non-Destructive Testing Techniques
- Asphalt Pavement Performance Evaluation
ZHAW Zurich University of Applied Sciences
2014-2024
Paul Scherrer Institute
2019
Computational Physics (United States)
2014-2016
Swiss Federal Laboratories for Materials Science and Technology
2003-2012
University of Bern
1994-2003
FIB‐nanotomography (FIB‐nt) is applied to record high‐resolution 3D pore networks from cementitious materials. Based on these data, it examined as why the size distribution (PSD), which obtained traditional analysis by mercury intrusion porosimetry (MIP), principally deviates findings that are achieved common back‐scattered electron image analysis. The paper does not reflect vulnerability of physical model assumptions, but merely focuses fundamental issues geometrical definition a PSD. A...
Three-dimensional (3D) data represent the basis for reliable quantification of complex microstructures. Therefore, development high-resolution tomography techniques is major importance many materials science disciplines. In this paper, we present a novel serial sectioning procedure 3D analysis using dual-beam FIB (focused ion beam). A very narrow and reproducible spacing between individual imaging planes achieved by drift correction algorithms in automated slicing procedure. The nearly same...
A multi-method approach was used for the investigation and comparison of alkali-activated slag binders (AAS), pure ordinary Portland cement (OPC). X-ray fluorescence, powder diffraction, granulometry, calorimetry, thermo-gravimetric analysis environmental scanning electron microscope investigations microstructure with energy dispersive analyses were to characterise cements their hydrate phases. In addition, chemical composition pore solution, including different sulphur-containing ions,...
Empirical relationships between effective conductivities in porous and composite materials their geometric characteristics such as volume fraction , tortuosity τ constrictivity β are established. For this purpose, 43 virtually generated 3D microstructures with varying considered. Effective determined by numerical transport simulations. Using error‐minimization the following have been established: (simplified formula) intrinsic conductivity σ 0 geodesic relative prediction errors of 19% 18%,...
Abstract Local porosity theory in combination with percolation was applied to shale microstructures that were reconstructed on the basis of focused ion beam nanotomography and scanning transmission electron microscopy. This allowed characterizing pore Opalinus clay length scales order tens microns. In a sample from sandy facies (with low content), fraction “larger” pores ϕ (radii~ > 15 nm) = 0.076 is substantially higher than shaley where 0.015. The resolved possesses certain degree...
A new 3D‐microscopy method, focused ion beam‐nanotomography (FIB‐nt), has been applied to the statistical particle shape analysis and for topological characterization of granular textures in cement samples. Because its high resolution (15 nm), FIB‐nt reveals precise microstructural information at submicrometer scale, which cannot be obtained with conventional tomography methods. It is demonstrated that even from complex dense agglomerates, it possible identify individual sub‐grains. This...
The microstructure influence on conductive transport processes is described in terms of volume fraction ε, tortuosity τ, and constrictivity β. Virtual microstructures with different parameter constellations are produced using methods from stochastic geometry. Effective conductivities obtained solving the diffusion equation a finite element model. In this way, large database generated which used to test expressions describing micro–macro relationships such as Archie's law, tortuosity,...
This paper presents a proof-of-concept study and demonstrates the next generation of “smart” catalyst material, applicable to high temperature catalysis electro-catalysis such as gas processing for solid oxide cells.