Roelofs, F. ; Vogelsberger, W. ; Buntkowsky, G. (2008)
Kinetic Size Effect During Dissolution of a Synthetic gamma-Alumina.
In: Zeitschrift Fur Physikalische Chemie-International Journal of Research in Physical Chemistry & Chemical Physics, 222 (8-9)
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
The dissolution process of a technical, nanodispersed gamma-alumina in water was Studied at 25 degrees C in the pH range 3.0 <= pH <= 11.5. Thereby, especial attention was paid to the influeuce of supersaturation on the dissolution behaviour observed. In conclusion, we were able to verify a size 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,,elected 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 factor. As it 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: | 2008 |
| Autor(en): | Roelofs, F. ; Vogelsberger, W. ; Buntkowsky, G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Kinetic Size Effect During Dissolution of a Synthetic gamma-Alumina |
| Sprache: | Englisch |
| Publikationsjahr: | 2008 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Zeitschrift Fur Physikalische Chemie-International Journal of Research in Physical Chemistry & Chemical Physics |
| Jahrgang/Volume einer Zeitschrift: | 222 |
| (Heft-)Nummer: | 8-9 |
| URL / URN: | http://apps.webofknowledge.com/full_record.do?product=WOS&se... |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | The dissolution process of a technical, nanodispersed gamma-alumina in water was Studied at 25 degrees C in the pH range 3.0 <= pH <= 11.5. Thereby, especial attention was paid to the influeuce of supersaturation on the dissolution behaviour observed. In conclusion, we were able to verify a size 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,,elected 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 factor. As it 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. |
| Freie Schlagworte: | dissolution alumina kinetic size effect entstehenden kristallinen formen aqueous-electrolyte solutions acid-base reactions oxygen-exchange solubility oxide adsorption speciation chemistry gibbsite |
| Zusätzliche Informationen: | 376CU Times Cited:0 Cited References Count:53 |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 27 Okt 2014 20:48 |
| Letzte Änderung: | 03 Jul 2024 02:22 |
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| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
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Kinetic Size Effect During Dissolution of a Synthetic γ-Alumina. (deposited 12 Jul 2021 12:15)
- Kinetic Size Effect During Dissolution of a Synthetic gamma-Alumina. (deposited 27 Okt 2014 20:48) [Gegenwärtig angezeigt]
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