A5051348791- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Gamma-ray bursts and supernovae
- Nuclear Physics and Applications
- Hydrocarbon exploration and reservoir analysis
- Silicon Effects in Agriculture
- earthquake and tectonic studies
- Clay minerals and soil interactions
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Astrophysics and Star Formation Studies
- Silicon and Solar Cell Technologies
- Mineralogy and Gemology Studies
- Geological Studies and Exploration
- Geomagnetism and Paleomagnetism Studies
- Spacecraft and Cryogenic Technologies
- Methane Hydrates and Related Phenomena
- Electromagnetic Launch and Propulsion Technology
- Geological Formations and Processes Exploration
- Advanced ceramic materials synthesis
Academic Center for Dentistry Amsterdam
2024
University of Amsterdam
2024
Vrije Universiteit Amsterdam
2024
Max Planck Institute for Chemistry
2012-2022
Max Planck Society
2011-2021
University of Bern
2008-2018
University of Applied Sciences Mainz
2016
Vrije Universiteit Brussel
2014-2016
Ghent University
2012
James Cook University
2009
We provide new insights into the geochemistry of serpentinites from mid-ocean ridges (Mid-Atlantic Ridge and Hess Deep), passive margins (Iberia Abyssal Plain Newfoundland) fore-arcs (Mariana Guatemala) based on bulk-rock in situ mineral major trace element compositional data collected drill cores Deep Sea Drilling Project Ocean Program. These are important for constraining serpentinite-hosted inventory subduction zones. Bulk show up to several orders magnitude enrichments Cl, B, Sr, U, Sb,...
Abstract Integration of reconstructed human skin (RhS) into organ‐on‐chip (OoC) platforms addresses current limitations imposed by static culturing. This innovation, however, is not without challenges. Microfluidic devices, while powerful, often encounter usability, robustness, and gas bubble issues that hinder large‐scale high‐throughput setups. study aims to develop a novel re‐usable multi‐well microfluidic adaptor (MMA) with the objective provide flexible tool for biologists implementing...
We studied about 5000 μm2 of fine-grained matrix material in the Acfer 094 meteorite by high-resolution (nominal 50 nm) NanoSIMS ion imaging for presence O-rich presolar (stardust) grains. This approach permits identifying grains down to <100 nm size, compared >150 lower-resolution 100 surveys. The number density identified is a factor two three higher than what was found studies. abundances O isotope Group 3 and 4 are previously found. None shows strong enrichments 16O expected from model...
Abstract We report on Mg and Si isotope data of 86 presolar silicate grains identified through NanoSIMS oxygen ion imaging in thin sections carbonaceous ordinary chondrites. The O, Mg, 106 silicates (including studied previously by our group) suggest division O Group 1 into four subpopulations: (i) “normal,” (ii) 25 Mg-rich, (iii) 26 (iv) Mg-poor. Normal (∼60% grains) formed the winds low-mass asymptotic giant branch (AGB) stars, with defining linear arrays slopes ∼0.9 1.37, respectively,...
Abstract We investigated the inventory of presolar silicate, oxide, and silicon carbide (SiC) grains fine‐grained chondrule rims in six Mighei‐type ( CM ) carbonaceous chondrites (Banten, Jbilet Winselwan, Maribo, Murchison, Murray Yamato 791198), ‐related chondrite Sutter's Mill. Sixteen O‐anomalous (nine silicates, oxides) were detected, corresponding to a combined matrix‐normalized abundance ~18 ppm, together with 21 SiC (~42 ppm). Twelve O‐rich are enriched 17 O, could originate from...
We report the major element as well oxygen, magnesium, and silicon isotope composition of a unique presolar silicate grain found in fine-grained fraction Antarctic CR2 chondrite Graves Nunataks 95229. The is characterized by an extremely high 17O/16O ratio (6.3 ± 0.2 × 10−3) relative to solar values, whereas its 18O/16O within measurement uncertainty. It also shows enrichments 25,26Mg significant excess 30Si system compositions, with δ25Mg = 79 21‰, δ26Mg 70 20‰, δ30Si 379 92‰. This isotopic...
Of the isotopically distinctive mantle domains, so-called HIMU ("high-μ"; μ = 238U/204Pb) source is most extreme, and its genesis continues to be debated. We report very strong U enrichment at unchanged Th concentrations in Cretaceous oceanic serpentinites with exceptionally high 206Pb/204Pb (reaching 56) but 208Pb/204Pb. Similar, less features are found 1.9 billion years old altered crust (AOC). Forward modelling demonstrates that mantle, if metasomatised by supercritical liquids derived...
Abstract We measured the nickel isotope composition of troilites from chondritic meteorites using NanoSIMS to put constraints on abundance iron-60 in early solar system. The were selected petrologic type 3 ordinary and carbonaceous chondrites. Based petrographic observations mineral chemistry, targeted for analysis crystallized melts, most likely a nebular setting. Our analyses did not reveal any significant correlation between nickel-60 enrichments Fe/Ni ratios, either entire set troilite...
Studying the isotopic composition of Solar System materials contributes to a better understanding their nature and genesis.
Abstract We report high-resolution (<100 nm) Mg and Si isotope data of 12 presolar silicate grains (230–440 from red giant and/or asymptotic branch stars that were previously identified based on their anomalous O-isotopic compositions (11 Group 1 one 2 grain) in five primitive meteorites. The acquired by NanoSIMS ion imaging with the new Hyperion source permits measurements silicates higher precision than was possible before. For a subset (“category A”) grains, 25 Mg/ 24 29 Si/ 28 ratios...
Abstract The abundance of iron-60 in the early solar system is important for planetary evolution models, and has been hotly debated. To put further constraints on initial 60 Fe/ 56 Fe ratio system, here we present new iron-nickel isotope data, measured situ by NanoSIMS, 14 silicate chondrules from three carbonaceous unequilibrated ordinary chondrites. NanoSIMS measurements were performed at high spatial resolution (200–300 nm primary beam diameter), to avoid inclusion unwanted phases...
Abstract We analyzed seven presolar SiC grains of supernova origin (average diameter: 1–2 μ m) with transmission electron microscopy. Five are polycrystalline, whereas two single crystals. Individual crystal domains polycrystalline in epitaxial relationship, consisting almost entirely twinned domains. Most free inclusions (only one TiC inclusion and iron- nickel-rich were found separate grains). Almost all crystals have cubic symmetry (3C polytype), but we hexagonal (6H polytype) grains. The...