| 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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Hansen, Thomas Willum
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (55/55 displayed)
- 2024Interpretability of high-resolution transmission electron microscopy imagescitations
- 2024Interpretability of high-resolution transmission electron microscopy imagescitations
- 2024Oxygen-defective electrostrictors for soft electromechanicscitations
- 2024Oxygen-defective electrostrictors for soft electromechanicscitations
- 2024Beam induced heating in electron microscopy modeled with machine learning interatomic potentialscitations
- 2024Tracing the graphitization of polymers:A novel approach for direct atomic-scale visualizationcitations
- 2023Quantifying noise limitations of neural network segmentations in high-resolution transmission electron microscopycitations
- 2023Reconstructing the exit wave of 2D materials in high-resolution transmission electron microscopy using machine learningcitations
- 2022Machine-Learning Assisted Exit-wave Reconstruction for Quantitative Feature Extraction
- 2022Stereolithography-Derived Three-Dimensional Pyrolytic Carbon/Mn3O4 Nanostructures for Free-Standing Hybrid Supercapacitor Electrodescitations
- 2022Stereolithography-Derived Three-Dimensional Pyrolytic Carbon/Mn 3 O 4 Nanostructures for Free-Standing Hybrid Supercapacitor Electrodescitations
- 2021Reconstructing the exit wave in high-resolution transmission electron microscopy using machine learningcitations
- 2021Electron beam effects in high-resolution transmission electron microscopy investigations of catalytic nanoparticles
- 2020In Situ Study of the Motion of Supported Gold Nanoparticles
- 2020Reduction and carburization of iron oxides for Fischer–Tropsch synthesiscitations
- 2018Carbon support effects on the selectivity of Pd/C catalysts for the hydrogenation of multifunctional chemicals
- 2017Accuracy of surface strain measurements from transmission electron microscopy images of nanoparticlescitations
- 2017Induced Mesocrystal-Formation, Hydrothermal Growth and Magnetic Properties of α-Fe2O3 Nanoparticles in Salt-Rich Aqueous Solutionscitations
- 2016Development of the Atomic-Resolution Environmental Transmission Electron Microscopecitations
- 2015Environmental TEM study of the dynamic nanoscaled morphology of NiO/YSZ during reductioncitations
- 2015Intermetallic GaPd2 Nanoparticles on SiO2 for Low-Pressure CO2 Hydrogenation to Methanolcitations
- 2015Intermetallic GaPd 2 Nanoparticles on SiO 2 for Low-Pressure CO 2 Hydrogenation to Methanol:Catalytic Performance and In Situ Characterizationcitations
- 2014Insights into chirality distributions of single-walled carbon nanotubes grown on different CoxMg1-xO solid solutionscitations
- 2014NiO/YSZ Reduction for SOFC/SOEC Studied In Situ by Environmental Transmission Electron Microscopycitations
- 2014Insights into chirality distributions of single-walled carbon nanotubes grown on different Co x Mg1- x O solid solutionscitations
- 2014Pattern recognition approach to quantify the atomic structure of graphenecitations
- 2014Structure Identification in High-Resolution Transmission Electron Microscopic Imagescitations
- 2014In Situ Study of Noncatalytic Metal Oxide Nanowire Growthcitations
- 2013Automated Structure Detection in HRTEM Images: An Example with Graphene
- 2013Focused electron beam induced processing and the effect of substrate thickness revisitedcitations
- 2013Focused electron beam induced processing and the effect of substrate thickness revisitedcitations
- 2013In situ Transmission Electron Microscopy of catalyst sinteringcitations
- 2013Optical coupling in the ETEM
- 2013Sintering of Catalytic Nanoparticles: Particle Migration or Ostwald Ripening?citations
- 2013Dynamics of Catalyst Nanoparticles
- 2013The role of electron-stimulated desorption in focused electron beam induced depositioncitations
- 2013The role of electron-stimulated desorption in focused electron beam induced depositioncitations
- 2012Dynamic study of carbon nanotube growth and catalyst morphology evolution during acetylene decomposition on Co/SBA-15 in an environmental TEM
- 2012Dynamic study of carbon nanotube growth and catalyst morphology evolution during acetylene decomposition on Co/SBA-15 in an environmental TEM
- 2012Mechanical properties of low-density polyethylene filled by graphite nanoplateletscitations
- 2012Mechanical properties of low-density polyethylene filled by graphite nanoplateletscitations
- 2012Acetic Acid Formation by Selective Aerobic Oxidation of Aqueous Ethanol over Heterogeneous Ruthenium Catalystscitations
- 2011Nanometer-scale lithography on microscopically clean graphenecitations
- 2011Nanometer-scale lithography on microscopically clean graphenecitations
- 2011Ultrahigh resolution focused electron beam induced processing: the effect of substrate thicknesscitations
- 2011In-situ reduction of promoted cobalt oxide supported on alumina by environmental transmission electron microscopycitations
- 2011Dynamic studies of catalysts for biofuel synthesis in an Environmental Transmission Electron Microscope
- 2010In situ redox cycle of a nickel–YSZ fuel cell anode in an environmental transmission electron microscopecitations
- 2010In situ redox cycle of a nickel–YSZ fuel cell anode in an environmental transmission electron microscopecitations
- 2010Using environmental transmission electron microscope to study the in-situ reduction of Co3O4 supported on α-Al2O3
- 2010Dynamics of Supported Metal Nanoparticles Observed in a CS Corrected Environmental Transmission Electron Microscope
- 2010Dynamical Response of Catalytic Systems in a CS Corrected Environmental Transmission Electron Microscope
- 2009The Titan Environmental Transmission Electron Microscopecitations
- 2007Structural and Morphological Characterization of Cerium Oxide Nanocrystals Prepared by Hydrothermal Synthesiscitations
- 2006Sintering and Particle Dynamics in Supported Metal Catalysts
Places of action
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article
Induced Mesocrystal-Formation, Hydrothermal Growth and Magnetic Properties of α-Fe2O3 Nanoparticles in Salt-Rich Aqueous Solutions
Abstract
Iron oxide nanoparticles are widely prevalent in our aqueous environment (e. g., streams, seawater, hydrothermal vents). Their aggregation and crystal growth depend on their chemical surroundings, for instance just a change in pH or salt concentration can greatly affect this. In turn this influences their properties, mobility, fate, and environmental impact. We studied the growth of α-Fe<sub>2</sub>O<sub>3</sub> (hematite), starting from 8 nm hematite particles in weakly acidic (HNO3) aqueous suspension with different states of particle aggregation, using salt (NaCl and NaH2PO4) to control their initial aggregation state. The samples were then subject to hydrothermal treatment at 100-140 degrees C. We followed the development in aggregation state and particle size by dynamic light scattering, X-ray diffraction, small angle neutron scattering and transmission electron microscopy, and the magnetic properties by Mossbauer spectroscopy. The addition of NaCl and NaH2PO4 both led to aggregation, but NaCl led to linear chains of hematite nanoparticles (oriented parallel to their hexagonal c-axis), such that the crystalline lattice planes of neighboring hematite particles were aligned. However, despite this oriented alignment, the particles did not merge and coalesce. Rather they remained stable as mesocrystals until heat-treated. In turn, the addition of NaCl significantly increases the rate of growth during hydrothermal treatment, probably because the nanoparticles, due to the chain formation, are already aligned and in close proximity. With hydrothermal treatment, the magnetic properties of the particles transform from those characteristic of small (aggregated) hematite nanoparticles to those of particles with more bulk-like properties such as Morin transition and suppression of superparamagnetic relaxation, in correspondence with the growth of particle size.