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http://hdl.handle.net/2445/119727
Title: | Under what conditions does (SiO)(N) nucleation occur? A bottom-up kinetic modelling evaluation |
Author: | Bromley, Stefan Thomas Gomez Martin, Juan Carlos Plane, John M. C. |
Keywords: | Compostos de silici Materials nanoestructurats Pols còsmica Silicon compounds Nanostructured materials Cosmic dust |
Issue Date: | 14-Oct-2016 |
Publisher: | Royal Society of Chemistry |
Abstract: | Silicon monoxide (SiO) is a structurally complex compound exhibiting differentiated oxide-rich and silicon-rich nano-phases at length scales covering nanoclusters to the bulk. Although nano-sized and nano-segregated SiO has great technological potential (e.g. nano-silicon for optical applications) and is of enormous astronomical interest (e.g. formation of silicate cosmic dust) an accurate general description of SiO nucleation is lacking. Avoiding the deficiencies of a bulk-averaged approach typified by classical nucleation theory (CNT) we employ a bottom-up kinetic model which fully takes into account the atomistic details involved in segregation. Specifically, we derive a new low energy benchmark set of segregated (SiO)(N) cluster ground state candidates for N <= 20 and use the accurately calculated properties of these isomers to calculate SiO nucleation rates. We thus provide a state-of-the art evaluation of the range of pressure and temperature conditions for which formation of SiO will or will not proceed. Our results, which match with available experiment, reveal significant deficiencies with CNT approaches. We employ our model to shed light on controversial issue of circumstellar silicate dust formation showing that, at variance with the predictions from CNT-based calculations, pure SiO nucleation under such conditions is not viable. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1039/c6cp03629e |
It is part of: | Physical Chemistry Chemical Physics, 2016, vol. 18, num. 38, p. 26913-26922 |
URI: | http://hdl.handle.net/2445/119727 |
Related resource: | https://doi.org/10.1039/c6cp03629e |
ISSN: | 1463-9076 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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