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https://hdl.handle.net/10216/49951
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DC Field | Value | Language |
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dc.creator | M. Jorge | |
dc.creator | Scott M. Auerbach | |
dc.creator | P. A. Monson | |
dc.date.accessioned | 2022-09-07T19:28:33Z | - |
dc.date.available | 2022-09-07T19:28:33Z | - |
dc.date.issued | 2005 | |
dc.identifier.issn | 0002-7863 | |
dc.identifier.other | sigarra:56628 | |
dc.identifier.uri | https://hdl.handle.net/10216/49951 | - |
dc.description.abstract | We present a lattice model describing the formation of silica nanoparticles in the early stages of the clear-solution templated synthesis of silicalite-1 zeolite. Silica condensation/hydrolysis is modeled by a nearest-neighbor attraction, while the electrostatics are represented by an orientation-dependent, short-range interaction. Using this simplified model, we show excellent qualitative agreement with published experimental observations. The nanoparticles are identified as a metastable state, stabilized by electrostatic interactions between the negatively charged silica surface and a layer of organic cations. Nanoparticle size is controlled mainly by the solution pH, through nanoparticle surface charge. The size and concentration of the charge-balancing cation are found to have a negligible effect on nanoparticle size. Increasing the temperature allows for further particle growth by Ostwald ripening. We suggest that this mechanism may play a role in the growth of zeolite crystals. | |
dc.language.iso | eng | |
dc.rights | openAccess | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc/4.0/ | |
dc.subject | Química molecular, Engenharia química | |
dc.subject | Molecular chemistry, Chemical engineering | |
dc.title | Modeling spontaneous formation of precursor nanoparticles in clear-solution zeolite synthesis | |
dc.type | Artigo em Revista Científica Internacional | |
dc.contributor.uporto | Faculdade de Engenharia | |
dc.subject.fos | Ciências da engenharia e tecnologias::Engenharia química | |
dc.subject.fos | Engineering and technology::Chemical engineering | |
Appears in Collections: | FEUP - Artigo em Revista Científica Internacional |
This item is licensed under a Creative Commons License