| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Keller, Thomas F.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2025Unveiling nano-scale chemical inhomogeneity in surface oxide films formed on V- and N-containing martensite stainless steel by synchrotron X-ray photoelectron emission spectroscopy/microscopy and microscopic X-ray absorption spectroscopycitations
- 2024Probing active sites on Pd/Pt alloy nanoparticles by CO adsorptioncitations
- 2024Unveiling nano-scale chemical inhomogeneity in surface oxide films formed on V- and N-containing martensite stainless steel by synchrotron X-ray photoelectron emission spectroscopy/microscopy and microscopic X-ray absorption spectroscopycitations
- 2024Probing Active Sites on Pd/Pt Alloy Nanoparticles by CO Adsorption
- 2023Optical properties of slot-die coated hybrid colloid/cellulose-nanofibril thin filmscitations
- 2023Effect of cyclic loading on microstructure and crack propagation in additively manufactured biomaterial Co–Cr–Mo alloycitations
- 2023Reversible Ultrathin PtO$_x$ Formation at the Buried Pt/YSZ(111) Interface Studied In Situ under Electrochemical Polarizationcitations
- 2023Optical Properties of Slot‐Die Coated Hybrid Colloid/Cellulose‐Nanofibril Thin Filmscitations
- 2023Optical Properties of Slot‐Die Coated Hybrid Colloid/Cellulose‐Nanofibril Thin Filmscitations
- 2022Evolution of Hierarchically Porous Nickel Alumina Catalysts Studied by X‐Ray Ptychographycitations
- 2022Laser-Assisted Micro-Solder Bumping for Copper and Nickel-Gold Pad Finishcitations
- 2022Hydrogen-Induced Micro-Strain Evolution in Super Duplex Stainless Steel—Correlative High-Energy X-Ray Diffraction, Electron Backscattered Diffraction, and Digital Image Correlationcitations
- 2022Hydrogen-Induced Micro-Strain Evolution in Super Duplex Stainless Steel—Correlative High-Energy X-Ray Diffraction, Electron Backscattered Diffraction, and Digital Image Correlationcitations
- 2021A model study on controlling dealloying corrosion attack by lateral modification of surfactant inhibitorscitations
- 2021A model study on controlling dealloying corrosion attack by lateral modification of surfactant inhibitorscitations
- 2020Polymers at Planar Surfaces and Interfaces
- 2020Lateral Variation of the Native Passive Film on Super Duplex Stainless Steel Resolved by Synchrotron Hard X-Ray Photoelectron Emission Microscopycitations
- 2020Soft Condensed Matter on the Nanoscale
- 2020Giant electrochemical actuation in a nanoporous silicon-polypyrrole hybrid materialcitations
- 2019Solution blow spinning of polymer/nanocomposite micro-/nanofibers with tunable diameters and morphologies using a gas dynamic virtual nozzlecitations
- 2019Solution blow spinning of polymer/nanocomposite micro-/nanofibers with tunable diameters and morphologies using a gas dynamic virtual nozzlecitations
- 2019Mapping the Pore Architecture of Structured Catalyst Monoliths from Nanometer to Centimeter Scale with Electron and X-ray Tomographiescitations
- 2019Coherent X-ray Imaging of CO-Adsorption-Induced Structural Changes in Pt Nanoparticles: Implications for Catalysiscitations
- 2013Alignment of multi-wall carbon nanotubes by disentanglement in ultra-thin melt-drawn polymer filmscitations
Places of action
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article
Evolution of Hierarchically Porous Nickel Alumina Catalysts Studied by X‐Ray Ptychography
Abstract
The synthesis of hierarchically porous materials usually requires complex experimental procedures, often based around extensive trial and error approaches. One common synthesis strategy is the sol–gel method, although the relation between synthesis parameters, material structure and function has not been widely explored. Here, in situ 2D hard X-ray ptychography (XRP) and 3D ptychographic X-ray computed tomography (PXCT) are applied to monitor the development of hierarchical porosity in Ni/Al$_2$O$_3$ and Al$_2$O$_3$ catalysts with connected meso- and macropore networks. In situ XRP allows to follow textural changes of a dried gel Ni/Al$_2$O$_3$ sample as a function of temperature during calcination, activation and CO$_2$ methanation reaction. Complementary PXCT studies on dried gel particles of Ni/Al$_2$O$_3$ and Al$_2$O$_3$ provide quantitative information on pore structure, size distribution, and shape with 3D spatial resolution approaching 50 nm, while identical particles are imaged ex situ before and after calcination. The X-ray imaging results are correlated with N$_2$-sorption, Hg porosimetry and He pycnometry pore characterization. Hard X-ray nanotomography is highlighted to derive fine structural details including tortuosity, branching nodes, and closed pores, which are relevant in understanding transport phenomena during chemical reactions. XRP and PXCT are enabling technologies to understand complex synthesis pathways of porous materials.