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Autor:  

Pelster, Stefan Alexander

Titel:  

Untersuchung der Festkörperbildung von Silicaten mittels Massenspektrometrie


Dissertation 
URN:  urn:nbn:de:hbz:294-18993
URL:  http://www-brs.ub.ruhr-uni-bochum.de/netahtml/HSS/Diss/PelsterStefanAlexander/diss.pdf
Format:  application/pdf (7.5 M)
Kommentar:  Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie. Tag der mündlichen Prüfung: 2007-04-20

Inhaltsverzeichnis
Datei:  http://www-brs.ub.ruhr-uni-bochum.de/netahtml/HSS/Diss/PelsterStefanAlexander/Inhaltsverzeichnis.pdf
Format:  application/pdf (43.5 k)

Zusammenfassung
Datei:  http://www-brs.ub.ruhr-uni-bochum.de/netahtml/HSS/Diss/PelsterStefanAlexander/Zusammenfassung.pdf
Format:  application/pdf (65.8 k)

Schlagworte:  Elektronensprayionisations-Massenspektrometrie; Keimbildung; Zeolith; Silicate; Kristallbildung

Inhalt der Arbeit: 

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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