| 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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Wang, Di
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (23/23 displayed)
- 2024Graphitizability of Polymer Thin Films: An In Situ TEM Study of Thickness Effects on Nanocrystalline Graphene/Glassy Carbon Formationcitations
- 2024Dependence of the Structural and Magnetic Properties on the Growth Sequence in Heterostructures Designed by YbFeO$_3$ and BaFe$_{12}$O$_{19}$
- 2023Graphitizability of Polymer Thin Films: An In Situ TEM Study of Thickness Effects on Nanocrystalline Graphene/Glassy Carbon Formationcitations
- 2023Biosynthesis of ternary NiCoFe$_2$O$_4$ nanoflowers: investigating their 3D structure and potential use in gene delivery
- 2023Bituminous binder and bituminous mixture modified with waste polyethylenecitations
- 2023A New Class of Cluster–Matrix Nanocomposite Made of Fully Miscible Components
- 2022Correction: Progressive changes in crystallographic textures of biominerals generate functionally graded ceramics
- 2022Rheological properties of asphalt binder modified with waste polyethylene: an interlaboratory research from the RILEM TC WMRcitations
- 2022Structure and magnetic properties of Fe-Co alloy nanoparticles synthesized by pulsed-laser inert gas condensationcitations
- 2022Progressive changes in crystallographic textures of biominerals generate functionally graded ceramicscitations
- 2022RILEM interlaboratory study on the mechanical properties of asphalt mixtures modified with polyethylene wastecitations
- 2021Disclosing the role of gold on palladium - gold alloyed supported catalysts in formic acid decompositioncitations
- 2019Thin Films of Thermally Stable Ordered Mesoporous $Rh_{2}O_{3}(I)$ for Visible-Light Photocatalysis and Humidity Sensingcitations
- 2019Investigation on the effect of physical hardening and aging temperature on low-temperature rheological properties of asphalt bindercitations
- 2019Cyclic Voltammetry Characterization of Au, Pd, and AuPd Nanoparticles Supported on Different Carbon Nanofiberscitations
- 2019Mapping the Pore Architecture of Structured Catalyst Monoliths from Nanometer to Centimeter Scale with Electron and X-ray Tomographiescitations
- 2018Synthesis, structural characterization and magnetic properties of ordered mesoporous $Pr_{1−x}Ca_{x}MnO_{3}$ thin filmscitations
- 2017Applying Capacitive Energy Storage for In Situ Manipulation of Magnetization in Ordered Mesoporous Perovskite-Type LSMO Thin Filmscitations
- 2016Characterisation of gold catalystscitations
- 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
- 2016In situ tuning of magnetization via topotactic lithium insertion in ordered mesoporous lithium ferrite thin filmscitations
- 2010Pd on carbon nanotubes for liquid phase alcohol oxidationcitations
Places of action
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article
Influence of gas atmospheres and ceria on the stability of nanoporous gold studied by environmental electron microscopy and in situ ptychography
Abstract
A novel complementary approach of electron microscopy/environmental TEM and in situ hard X-ray ptychography was used to study the thermally induced coarsening of nanoporous gold under different atmospheres, pressures and after ceria deposition. The temperature applied during ptychographic imaging was determined by IR thermography. While using elevated temperatures (room temperature – 400 °C) and realistic gas atmospheres (1 bar) we achieved for the first time a spatial resolution of about 20 nm during hard X-ray ptychography. The annealing of pure and ceria stabilized nanoporous gold in different atmospheres revealed that the conditions have a tremendous influence on the coarsening. The porous structure of the samples was stable up to approximately 800 °C in vacuum, whereas pronounced changes and coarsening were observed already at approximately 300 °C in oxygen containing atmospheres. A layer of ceria on the nanoporous gold led to an improvement of the stability, but did not alleviate the influence of the gas atmosphere. Different behaviors were observed, such as coarsening and even material loss or migration. The results suggest that additional mechanisms beyond surface diffusion need to be considered and that microscopic studies aimed at more realistic conditions are important to understand the behavior of such materials and catalysts.