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
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Roelofs, Frank ; Vogelsberger, Wolfram ; Buntkowsky, Gerd |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Kinetic Size Effect During Dissolution of a Synthetic γ-Alumina |
| Sprache: | Englisch |
| Publikationsjahr: | 2021 |
| Publikationsdatum der Erstveröffentlichung: | 2008 |
| Verlag: | De Gruyter |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Zeitschrift für Physikalische Chemie |
| Jahrgang/Volume einer Zeitschrift: | 222 |
| (Heft-)Nummer: | 8-9 |
| DOI: | 10.26083/tuprints-00018894 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/18894 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | 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: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-188949 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 12 Jul 2021 12:15 |
| Letzte Änderung: | 03 Jul 2024 02:22 |
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- Kinetic Size Effect During Dissolution of a Synthetic γ-Alumina. (deposited 12 Jul 2021 12:15) [Gegenwärtig angezeigt]
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