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Nanoscopic and in-situ cross-sectional observations of Li-based conversion coating formation using liquid-phase TEM Vrije Universiteit Brussel

Ali Kosari, Frans Tichelaar, Peter Visser, Peyman Taheri, H. Zandbergen, Herman Terryn, Johannes M. C. Mol

Lithium salts have been proposed as promising environmentally friendly alternatives to carcinogenic hexavalent chromium-based inhibitors for the corrosion protection of aerospace aluminium alloys (AAs). Incorporated into organic coatings, lithium salts are released at damaged locations to establish a conversion layer in which distinct sublayers have different barrier characteristics. Thus, detailed knowledge on the sequence of formation ...

Dealloying-driven local corrosion by intermetallic constituent particles and dispersoids in aerospace aluminium alloys Vrije Universiteit Brussel

Ali Kosari, Frans Tichelaar, Peter Visser, H. Zandbergen, Herman Terryn, Johannes M. C. Mol

Nanoscopic characterization of heterogeneous intermetallic particles (IMPs) which microstructurally and compositionally evolve during local corrosion is crucial in unravelling the mechanisms and sequence of initial and local corrosion events. Herein, we study site-specific initiation events focused on microscopic constituent intermetallic compounds and nanoscopic dispersoids in AA2024-T3 at the nanoscale using a combined quasi in-situ and ...

Epitaxial growth of Dy2O3 films on SrTiO3 (001) substrates by molecular beam epitaxy KU Leuven

Kabir Bhuiyan, Mariela Andrea Menghini, Jean-Pierre Locquet, Maria Seo, Christel Dieker, Wolfgang Jaeger, Chiara Marchiori
Epitaxial Dy2O3 thin films are grown on SrTiO3(001) substrates by molecular beam epitaxy. Structural, morphological, and interfacial properties of the Dy2O3 film are investigated by in situ reflection high-energy electron diffraction (RHEED), ex situ x-ray diffraction (XRD), atomic force microscopy, and cross-sectional transmission electron microscopy (TEM). RHEED patterns and XRD spectra show that the Dy2O3 film is grown epitaxially in a cubic ...

Epitaxial growth of Dy2O3 films on SrTiO3 (001) substrates by molecular beam epitaxy KU Leuven

Kabir Bhuiyan, Mariela Andrea Menghini, Jean-Pierre Locquet, Maria Seo
Epitaxial Dy2O3 thin films are grown on SrTiO3(001) substrates by molecular beam epitaxy. Structural, morphological, and interfacial properties of the Dy2O3 film are investigated by in situ reflection high-energy electron diffraction (RHEED), ex situ x-ray diffraction (XRD), atomic force microscopy, and cross-sectional transmission electron microscopy (TEM). RHEED patterns and XRD spectra show that the Dy2O3 film is grown epitaxially in a cubic ...

In-situ nanoscopic observations of dealloying-driven local corrosion from surface initiation to in-depth propagation Vrije Universiteit Brussel

Ali Kosari, H. Zandbergen, Frans Tichelaar, Peter Visser, Peyman Taheri, Herman Terryn, Johannes M. C. Mol

Dealloying is involved in materials science responsible for fabrication of nanoscale structures beneficially but for corrosion degradations detrimentally. Detailed understanding related to the latter is critical for designing corrosion-resistance alloys and dedicated inhibition systems. Thus, direct nanoscopic observations of nano-structural and compositional evolutions during the process are essential. Here using liquid phase-transmission ...

Monitoring the morphodynamics of the Zwin inlet: final report 2019-2022 period Waterbouwkundig Laboratorium

Anne-Lise Montreuil, Sebastian Dan, Rik Houthuys, Toon Verwaest
The Zwin tidal inlet and marshland system was nearly doubled in surface in 2019 when a large part of the Willem-Leopold polder was incorporated in the floodable area. The main channel connecting the marshlands to the sea is characterized by a complex 3D morphology with a main channel, sandy bedforms including banks and bars as well as secondary channels. Their presence and movements reflect active sediment transport in the system. The inlet is ...

Inferring plant functional diversity from space : the potential of Sentinel-2 Universiteit Gent

Xuanlong Ma, Miguel D Mahecha, Mirco Migliavacca, Fons van der Plas, Raquel Benavides, Sophia Ratcliffe, Jens Kattge, Ronny Richter, Talie Musavi, Lander Baeten, et al.
Plant functional diversity (FD) is an important component of biodiversity that characterizes the variability of functional traits within a community, landscape, or even large spatial scales. It can influence ecosystem processes and stability. Hence, it is important to understand how and why FD varies within and between ecosystems, along resources availability gradients and climate gradients, and across vegetation successional stages. Usually, FD ...

In-situ optical emission spectroscopy diagnostic of plasma ignition impact on crystalline silicon passivation by a-Si:H films Universiteit Hasselt KU Leuven

Hosny Meddeb, Twan Bearda, Yaser Abdulraheem, Wissem Dimassi, Hatem Ezzaouia, Ivan GORDON, Jozef Szlufcik, Jef POORTMANS
The influence of the plasma ignition condition during PECVD deposition from a silane/hydrogen mixture on the amorphous silicon passivation of crystalline silicon surface is investigated. The changes in this process step mainly consist in varying the power density for very brief durations in between 1 s and 3 s. We find that the ignition phase contributes significantly in the film growth, especially in the a-Si:H/c-Si interface formation. In ...

Phase transformations and shape memory effect in alloys of Zr-Ni-Co system KU Leuven

Jan Van Humbeeck
Intermetallic compounds of ZrNi-ZrCo cross-section undergo martensitic phase transformation, which is accompanied by the imperfect shape memory effect at elevated temperatures. Martensitic transformation is also taking place in one of the constituents for the in-situ composites of ZrCo-Zr2Co-Zr2Ni-ZrNi region. High temperature shape memory behavior of Zr-Ni-Co composite material shows improvement in shape recovery comparing to quasibinary ...

Detection and attribution of climate change and its impacts Vrije Universiteit Brussel

Luke Grant
Earth’s climate system encompasses feedbacks between our atmosphere, oceans, cryosphere, biosphere and lithosphere. Changes to our climate are driven by internally generated variability across these domains and, importantly, external forcings. The latter may be natural or anthropogenic in origin. Currently, our climate is changing at an unprecedented rate in the context of our observable and reconstructed records depicting the history of Earth’s ...