| 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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Fabricius, Ida Lykke
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2022Strain modeling in a marly chalk reservoir
- 2022Effect of Pyrite in Water Saturation Evaluation of Clay-Rich Carbonatecitations
- 2020Porosity in chalk – roles of elastic strain and plastic straincitations
- 2019Influence of temperature cycling and pore fluid on tensile strength of chalkcitations
- 2017Low-Field NMR Spectrometry of Chalk and Argillaceous Sandstones: Rock-Fluid Affinity Assessed from T-1/T-2 Ratio
- 2016Wettability of Chalk and Argillaceous Sandstones Assessed from T1/T2 Ratio
- 2014Burial stress and elastic strain of carbonate rockscitations
- 2011Petrophysical properties of greensand as predicted from NMR measurementscitations
- 2010Biot Critical Frequency Applied to Description of Failure and Yield of Highly Porous Chalk with Different Pore Fluidscitations
- 2008Chalk porosity and sonic velocity versus burial depthcitations
- 2007Elastic behaviour of North Sea chalkcitations
- 2000BET measurements: Outgassing of mineralscitations
Places of action
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article
BET measurements: Outgassing of minerals
Abstract
Outgassing minerals at elevated temperatures prior to BET measurements can lead to phase changes, especially in the case of amorphous and poorly crystalline materials. In order to evaluate the applicability of the BET method when low outgassing temperatures are required, selected aquifer minerals were outgassed at different temperatures and for different times. The studied minerals are 2-line ferrihydrite, goethite, lepidocrocite, quartz, calcite, ®-alumina, and kaolinite. The results demonstrate that measured specific surface areas of iron oxides are strongly dependent on outgassing conditions because the surface area increased by 170% with increasing temperature. In the poorly crystalline minerals, phase changes caused by heating were observed at temperatures lower than 100±C. Therefore low outgassing temperatures are preferable for minimizing phase changes. As demonstrated in this study, stable BET values can be obtained by increasing the outgassing time without heating iron oxides. For quartz, calcite, ®-alumina, and kaolinite, stableBETvalues were obtained after outgassing the minerals at 100 to 250±C for 2 h. However, outgassing these minerals at room temperature (20±C) only resulted in minor errors, implying that aquifer sediments containing poorly crystalline materials can be outgassed at low temperatures if the outgassing time is increased. Scanning electron microscopy of the studied minerals demonstrated that the particle size as calculated from BET data compares well with particle size observed by scanning electron microscopy images. C ° 2000 Academic Press