Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/49951
Author(s): | M. Jorge Scott M. Auerbach P. A. Monson |
Title: | Modeling spontaneous formation of precursor nanoparticles in clear-solution zeolite synthesis |
Issue Date: | 2005 |
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. |
Subject: | Química molecular, Engenharia química Molecular chemistry, Chemical engineering |
Scientific areas: | Ciências da engenharia e tecnologias::Engenharia química Engineering and technology::Chemical engineering |
URI: | https://hdl.handle.net/10216/49951 |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | openAccess |
License: | https://creativecommons.org/licenses/by-nc/4.0/ |
Appears in Collections: | FEUP - Artigo em Revista Científica Internacional |
This item is licensed under a Creative Commons License