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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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Diaz, Ana
Paul Scherrer Institute
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2024Phase-separated polymer blends for controlled drug delivery by tuning morphologycitations
- 20234D nanoimaging of early age cement hydrationcitations
- 20233D-Imaging of synapses in neuronal tissues with synchrotron X-ray ptychographycitations
- 2023In situ compression of micropillars under coherent X-ray diffraction: a case study of experimental and data-analysis constraintscitations
- 2023Simple Synthesis of Monodisperse Ultrasmall Au Icosahedral Nanoparticlescitations
- 2022Near-infrared analysis of nanofibrillated cellulose aerogel manufacturingcitations
- 2022Near-infrared analysis of nanofibrillated cellulose aerogel manufacturingcitations
- 2022Evolution of Hierarchically Porous Nickel Alumina Catalysts Studied by X‐Ray Ptychographycitations
- 2022Temperature-dependent dynamic plasticity of micro-scale fused silicacitations
- 2021Quantitative analysis of cementitious materials by X-ray ptychographic nanotomography
- 2020Comparison of small‐angle neutron and X‐ray scattering for studying cortical bone nanostructurecitations
- 2019Quantitative disentanglement of nanocrystalline phases in cement pastes by synchrotron ptychographic X-ray tomographycitations
- 2018Photonic materials for high-temperature applications: synthesis and characterization by X-ray ptychographic tomography
- 2017Anisotropy development during HDPE necking studied at the microscale with in situ continuous 1D SAXS scanscitations
- 2016Novel micro-reactor flow cell for investigation of model catalysts using in situ grazing-incidence X-ray scatteringcitations
- 2016Influence of gas atmospheres and ceria on the stability of nanoporous gold studied by environmental electron microscopy and in situ ptychography
- 2016Influence of gas atmospheres and ceria on the stability of nanoporous gold studied by environmental electron microscopy and in situ ptychographycitations
- 2014Scanning X-ray strain microscopy of inhomogeneously strained Ge micro-bridgescitations
- 2013Density mapping of hardened cement paste using ptychographic X-ray computed tomographycitations
- 2012Preparation and characterization of ellipsoidal-shaped thermosensitive microgel colloids with tailored aspect ratioscitations
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.