Document Detail


Rapid synthesis of MFI zeolite nanocrystals.
MedLine Citation:
PMID:  16853420     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A rapid synthesis procedure for nonagglomerated silicalite nanocrystals has been developed. This was achieved by concentrating the precursor sol before 10-12 h of aging at 80 degrees C, followed by hydrothermal synthesis at 175 degrees C for 90 min. The high silica concentration in the concentrated sol accelerated the aggregation of primary units that were present early in the system. Thus, little silica nutrients were left for growth when the secondary particles were converted to zeolite during hydrothermal reaction. As a result, fully dispersible nanocrystals were obtained within a day instead of weeks as reported previously. The aggregation of primary units during the 80 degrees C aging process as well as the conversion of these aggregates into zeolite has been followed by DLS, XRD, and FTIR. In light of the new results, the nucleation and growth mechanisms of MFI zeolite that have been under debate in the literature were reexamined.
Authors:
Cheng-Ye Hsu; Anthony S T Chiang; Rosilda Selvin; Robert W Thompson
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  109     ISSN:  1520-6106     ISO Abbreviation:  J Phys Chem B     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2006-07-20     Completed Date:  2007-07-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  18804-14     Citation Subset:  IM    
Affiliation:
Department of Chemical & Materials Engineering, National Central University, 300 JungDa Rd., Chung Li, Taiwan ROC 32054.
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MeSH Terms
Descriptor/Qualifier:
Crystallization
Microscopy, Electron, Transmission / methods
Nanostructures / chemistry*
Particle Size
Temperature
Zeolites / chemical synthesis*,  chemistry
Chemical
Reg. No./Substance:
1318-02-1/Zeolites

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