Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale

Abstract A re-examination of measurements of heterogeneous nucleation of water vapor on silver nanoparticles is presented here using a model-free framework that derives the energy of critical cluster formation directly from measurements of nucleation probability. Temperature dependence is correlated...

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Autores principales:	Robert L. McGraw, Paul M. Winkler, Paul E. Wagner
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b6e50eecad364d91a76807abfebf984d
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spelling	oai:doaj.org-article:b6e50eecad364d91a76807abfebf984d2021-12-02T15:06:09ZTemperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale10.1038/s41598-017-16692-92045-2322https://doaj.org/article/b6e50eecad364d91a76807abfebf984d2017-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-16692-9https://doaj.org/toc/2045-2322Abstract A re-examination of measurements of heterogeneous nucleation of water vapor on silver nanoparticles is presented here using a model-free framework that derives the energy of critical cluster formation directly from measurements of nucleation probability. Temperature dependence is correlated with cluster stabilization by the nanoparticle seed and previously found cases of unusual increasing nucleation onset saturation ratio with increasing temperature are explained. A necessary condition for the unusual positive temperature dependence is identified, namely that the critical cluster be more stable, on a per molecule basis, than the bulk liquid to exhibit the effect. Temperature dependence is next examined in the classical Fletcher model, modified here to make the energy of cluster formation explicit in the model. The contact angle used in the Fletcher model is identified as the microscopic contact angle, which can be directly obtained from heterogeneous nucleation experimental data by a recently developed analysis method. Here an equivalent condition, increasing contact angle with temperature, is found necessary for occurrence of unusual temperature dependence. Our findings have immediate applications to atmospheric particle formation and nanoparticle detection in condensation particle counters (CPCs).Robert L. McGrawPaul M. WinklerPaul E. WagnerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Robert L. McGraw Paul M. Winkler Paul E. Wagner Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale
description	Abstract A re-examination of measurements of heterogeneous nucleation of water vapor on silver nanoparticles is presented here using a model-free framework that derives the energy of critical cluster formation directly from measurements of nucleation probability. Temperature dependence is correlated with cluster stabilization by the nanoparticle seed and previously found cases of unusual increasing nucleation onset saturation ratio with increasing temperature are explained. A necessary condition for the unusual positive temperature dependence is identified, namely that the critical cluster be more stable, on a per molecule basis, than the bulk liquid to exhibit the effect. Temperature dependence is next examined in the classical Fletcher model, modified here to make the energy of cluster formation explicit in the model. The contact angle used in the Fletcher model is identified as the microscopic contact angle, which can be directly obtained from heterogeneous nucleation experimental data by a recently developed analysis method. Here an equivalent condition, increasing contact angle with temperature, is found necessary for occurrence of unusual temperature dependence. Our findings have immediate applications to atmospheric particle formation and nanoparticle detection in condensation particle counters (CPCs).
format	article
author	Robert L. McGraw Paul M. Winkler Paul E. Wagner
author_facet	Robert L. McGraw Paul M. Winkler Paul E. Wagner
author_sort	Robert L. McGraw
title	Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale
title_short	Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale
title_full	Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale
title_fullStr	Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale
title_full_unstemmed	Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale
title_sort	temperature dependence in heterogeneous nucleation with application to the direct determination of cluster energy on nearly molecular scale
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b6e50eecad364d91a76807abfebf984d
work_keys_str_mv	AT robertlmcgraw temperaturedependenceinheterogeneousnucleationwithapplicationtothedirectdeterminationofclusterenergyonnearlymolecularscale AT paulmwinkler temperaturedependenceinheterogeneousnucleationwithapplicationtothedirectdeterminationofclusterenergyonnearlymolecularscale AT paulewagner temperaturedependenceinheterogeneousnucleationwithapplicationtothedirectdeterminationofclusterenergyonnearlymolecularscale
_version_	1718388605582311424

Temperature Dependence in Heterogeneous Nucleation with Application to the Direct Determination of Cluster Energy on Nearly Molecular Scale

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