Untersuchung der Festkörperbildung von Silicaten mittels Massenspektrometrie
- The early stages of crystal formation are an important issue in zeolite science. Especially the nucleation step causes major problems in experimental investigations. In this work electrospray ionization mass spectrometry (ESI-MS) is used as a quite novel technique to monitor the solid state formation process of aqueous silicates leading to zeolites like silicalite-1. The formation of specific structures is directed by organic additives like tetrapropylammonium (TPA). Up to now it is unclear at which stage in the solid-state formation process the template molecules exert their structure-directing. The results of this dissertation suggest a pathway of particle formation via amorphous intermediates which would recrystallize rather than a direct assembly process of defined silicate oligomers. Moreover, using isotopically labeled silicate atoms interconversion reactions between silicate species have been proved to be concerted, involving several silicon atoms simultaneously.
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| Author: | Stefan Alexander PelsterGND |
|---|---|
| URN: | urn:nbn:de:hbz:294-18993 |
| Referee: | Ferdi SchüthGND, William S. SheldrickGND |
| Document Type: | Doctoral Thesis |
| Language: | German |
| Date of Publication (online): | 2007/05/21 |
| Date of first Publication: | 2007/05/21 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Granting Institution: | Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie |
| Date of final exam: | 2007/04/20 |
| Creating Corporation: | Fakultät für Chemie und Biochemie |
| GND-Keyword: | Elektronensprayionisations-Massenspektrometrie; Keimbildung; Zeolith; Silicate; Kristallbildung |
| Institutes/Facilities: | Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr |
| Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie |
| faculties: | Fakultät für Chemie und Biochemie |
| Licence (German): |  Keine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht |
