| Rapid synthesis of MFI zeolite nanocrystals. | |
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MedLine Citation:
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PMID: 16853420 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Cheng-Ye Hsu; Anthony S T Chiang; Rosilda Selvin; Robert W Thompson |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The journal of physical chemistry. B Volume: 109 ISSN: 1520-6106 ISO Abbreviation: J Phys Chem B Publication Date: 2005 Oct |
Date Detail:
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Created Date: 2006-07-20 Completed Date: 2007-07-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101157530 Medline TA: J Phys Chem B Country: United States |
Other Details:
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Languages: eng Pagination: 18804-14 Citation Subset: IM |
Affiliation:
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Department of Chemical & Materials Engineering, National Central University, 300 JungDa Rd., Chung Li, Taiwan ROC 32054. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Crystallization Microscopy, Electron, Transmission / methods Nanostructures / chemistry* Particle Size Temperature Zeolites / chemical synthesis*, chemistry |
| Chemical | |
Reg. No./Substance:
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1318-02-1/Zeolites |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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