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Kinetic Size Effect During Dissolution of a Synthetic γ-Alumina

Roelofs, Frank ; Vogelsberger, Wolfram ; Buntkowsky, Gerd (2021)
Kinetic Size Effect During Dissolution of a Synthetic γ-Alumina.
In: Zeitschrift für Physikalische Chemie, 2008, 222 (8-9)
doi: 10.26083/tuprints-00018894
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Kinetic Size Effect During Dissolution of a Synthetic γ-Alumina
Language: English
Date: 2021
Place of Publication: Darmstadt
Year of primary publication: 2008
Publisher: De Gruyter
Journal or Publication Title: Zeitschrift für Physikalische Chemie
Volume of the journal: 222
Issue Number: 8-9
DOI: 10.26083/tuprints-00018894
Corresponding Links:
Origin: Secondary publication service

The dissolution process of a technical, nanodispersed γ-alumina in water was studied at 25 °C in the pH range 3.0 ≤ pH ≤ 11.5. Thereby, especial attention was paid to the influence ofsupersaturation on the dissolution behaviour observed. In conclusion, we were able to verify asize effect during the dissolution process, in the whole pH range investigated. In addition, we observed that changing supersaturation under identical conditions, leads to a shift of the maximum in the concentration profiles both, in absolute value and in time, when the maximum occurs. X-ray powder diffraction analysis and nitrogen adsorption measurements were used to identify the solid material collected during selected dissolution experiments. As a result, the formation of the aluminium phase -bayerite/gibbsite- could be excluded as a possible reason for the observed dissolution behaviour. The rate constants of the dissolution process were evaluated using the model of Gibbs free energy of cluster formation, which considers size effect among other factors. As a result, we were able to prove that the observed maxima in the concentration profiles were due to a kinetic size effect, caused by the size of the primary particles of the starting material, surface tension, and supersaturation in the system.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-188949
Classification DDC: 500 Science and mathematics > 540 Chemistry
Divisions: 07 Department of Chemistry > Eduard Zintl-Institut > Physical Chemistry
Date Deposited: 12 Jul 2021 12:15
Last Modified: 03 Aug 2023 10:59
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/18894
PPN: 510077129
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