Isoconversional kinetics of vaporization of nanoconfined liquids
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.molliq.2020.114824 http://hdl.handle.net/11449/209312 |
Resumo: | Isoconversional kinetic analysis is applied to thermogravimetry data on vaporization of n-decane and dimethyl sulfoxide from alumina nanopores and bulk. For bulk vaporization, the isoconversional activation energy is independent of conversion and equal to the enthalpy of vaporization. For vaporization from nanopores, the isoconversional activation energy varies stronglywith conversion, passing through aminimumat midrange conversions. This behavior is shown to be consistent with the successive transition of the rate control fromthe Kelvin effect to Knudsen diffusion, and eventually to surface diffusion. All three phenomena are demonstrated to have their specific activation energies. It has been determined that the deceleration of vaporization from nanopores is due to a dramatic decrease in the value of the preexponential factor. The decrease is linked to the high frequency of collisions with the pore walls and to a possibility of adsorption on the walls. (C) 2020 Elsevier B.V. All rights reserved. |
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Repositório Institucional da UNESP |
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Isoconversional kinetics of vaporization of nanoconfined liquidsArrhenius equationEvaporationKinetic parametersMass lossNanoRate constantThermogravimetry (TGA)Isoconversional kinetic analysis is applied to thermogravimetry data on vaporization of n-decane and dimethyl sulfoxide from alumina nanopores and bulk. For bulk vaporization, the isoconversional activation energy is independent of conversion and equal to the enthalpy of vaporization. For vaporization from nanopores, the isoconversional activation energy varies stronglywith conversion, passing through aminimumat midrange conversions. This behavior is shown to be consistent with the successive transition of the rate control fromthe Kelvin effect to Knudsen diffusion, and eventually to surface diffusion. All three phenomena are demonstrated to have their specific activation energies. It has been determined that the deceleration of vaporization from nanopores is due to a dramatic decrease in the value of the preexponential factor. The decrease is linked to the high frequency of collisions with the pore walls and to a possibility of adsorption on the walls. (C) 2020 Elsevier B.V. All rights reserved.Univ Alabama Birmingham, Dept Chem, 901 S 14th St, Birmingham, AL 35294 USAUniv Estadual Paulista, Inst Quim, CP 355, BR-14801970 Araraquara, SP, BrazilUniv Estadual Paulista, Inst Quim, CP 355, BR-14801970 Araraquara, SP, BrazilElsevier B.V.Univ Alabama BirminghamUniversidade Estadual Paulista (Unesp)Ekawa, Bruno [UNESP]Stanford, Victoria L.Vyazovkin, Sergey2021-06-25T11:55:57Z2021-06-25T11:55:57Z2021-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article7http://dx.doi.org/10.1016/j.molliq.2020.114824Journal Of Molecular Liquids. Amsterdam: Elsevier, v. 327, 7 p., 2021.0167-7322http://hdl.handle.net/11449/20931210.1016/j.molliq.2020.114824WOS:000637200400027Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Molecular Liquidsinfo:eu-repo/semantics/openAccess2021-10-23T19:28:03Zoai:repositorio.unesp.br:11449/209312Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T13:56:02.609429Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Isoconversional kinetics of vaporization of nanoconfined liquids |
title |
Isoconversional kinetics of vaporization of nanoconfined liquids |
spellingShingle |
Isoconversional kinetics of vaporization of nanoconfined liquids Ekawa, Bruno [UNESP] Arrhenius equation Evaporation Kinetic parameters Mass loss Nano Rate constant Thermogravimetry (TGA) |
title_short |
Isoconversional kinetics of vaporization of nanoconfined liquids |
title_full |
Isoconversional kinetics of vaporization of nanoconfined liquids |
title_fullStr |
Isoconversional kinetics of vaporization of nanoconfined liquids |
title_full_unstemmed |
Isoconversional kinetics of vaporization of nanoconfined liquids |
title_sort |
Isoconversional kinetics of vaporization of nanoconfined liquids |
author |
Ekawa, Bruno [UNESP] |
author_facet |
Ekawa, Bruno [UNESP] Stanford, Victoria L. Vyazovkin, Sergey |
author_role |
author |
author2 |
Stanford, Victoria L. Vyazovkin, Sergey |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Univ Alabama Birmingham Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Ekawa, Bruno [UNESP] Stanford, Victoria L. Vyazovkin, Sergey |
dc.subject.por.fl_str_mv |
Arrhenius equation Evaporation Kinetic parameters Mass loss Nano Rate constant Thermogravimetry (TGA) |
topic |
Arrhenius equation Evaporation Kinetic parameters Mass loss Nano Rate constant Thermogravimetry (TGA) |
description |
Isoconversional kinetic analysis is applied to thermogravimetry data on vaporization of n-decane and dimethyl sulfoxide from alumina nanopores and bulk. For bulk vaporization, the isoconversional activation energy is independent of conversion and equal to the enthalpy of vaporization. For vaporization from nanopores, the isoconversional activation energy varies stronglywith conversion, passing through aminimumat midrange conversions. This behavior is shown to be consistent with the successive transition of the rate control fromthe Kelvin effect to Knudsen diffusion, and eventually to surface diffusion. All three phenomena are demonstrated to have their specific activation energies. It has been determined that the deceleration of vaporization from nanopores is due to a dramatic decrease in the value of the preexponential factor. The decrease is linked to the high frequency of collisions with the pore walls and to a possibility of adsorption on the walls. (C) 2020 Elsevier B.V. All rights reserved. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T11:55:57Z 2021-06-25T11:55:57Z 2021-04-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.molliq.2020.114824 Journal Of Molecular Liquids. Amsterdam: Elsevier, v. 327, 7 p., 2021. 0167-7322 http://hdl.handle.net/11449/209312 10.1016/j.molliq.2020.114824 WOS:000637200400027 |
url |
http://dx.doi.org/10.1016/j.molliq.2020.114824 http://hdl.handle.net/11449/209312 |
identifier_str_mv |
Journal Of Molecular Liquids. Amsterdam: Elsevier, v. 327, 7 p., 2021. 0167-7322 10.1016/j.molliq.2020.114824 WOS:000637200400027 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal Of Molecular Liquids |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
7 |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128292306288640 |