Viscosity and density of two 1-alkyl-3-methyl-imidazolium triflate ionic liquids at high pressures: experimental measurements and the effect of alkyl chain length

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorSequeira, Maria Carolina-
Autor(es): dc.creatorAvelino, Helena Maria da Nóbrega Teixeira-
Autor(es): dc.creatorCaetano, Fernando J. P.-
Autor(es): dc.creatorFareleira, João M. N. A.-
Data de aceite: dc.date.accessioned2022-02-15T14:11:25Z-
Data de disponibilização: dc.date.available2022-02-15T14:11:25Z-
Data de envio: dc.date.issued2022-01-16-
Data de envio: dc.date.issued2022-01-16-
Data de envio: dc.date.issued2021-03-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/10400.2/11642-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/10400.2/11642-
Descrição: dc.descriptionNew measurements of the viscosity of 1-butyl-3-methyl-imidazolium triflate ([BMIM][OTf]) and 1-hexyl-3-methyl-imidazolium triflate ([HMIM][OTf]) have been carried out at high pressures, using a vibrating-wire technique operated in the forced mode of oscillation. The measurements for [BMIM][OTf] have been performed along six isotherms from 298 to 358 K at pressures up to 50 MPa. The viscosity measurements for [HMIM][OTf] have been carried out along five isotherms from 303 to 358 K at pressures up to 50 MPa. The estimated uncertainty of the measurements is less than U(η) = 0.02·η for viscosities up to 68 mPa·s and less than U(η) = 0.026·η for higher viscosities, with a confidence level of 0.95 (k = 2). For both ionic liquids, complementary density measurements have been performed using an Anton Paar HP densimeter in the same temperature and pressure ranges as those used for the viscosity measurements. The density results have an uncertainty smaller than U(ρ) = 0.002·ρ with a confidence level of 0.95 (k = 2). The viscosity results were correlated with the density data using a previously described hard-sphere-based technique. The individual correlations are able to describe the viscosity results for each liquid with an uncertainty smaller than the estimated uncertainty of the experimental data. The effect of alkyl substituents on the viscosity and the density of these ionic liquids has been analyzed. For this purpose, previously published results for the viscosity and density of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf]) have been considered in addition to the data obtained in the present work for [BMIM][OTf] and [HMIM][OTf].-
Descrição: dc.descriptionProject UID/QUI/00100/ 2013 (Fundação para a Ciência e a Tecnologia (FCT)); Project UID/QUI/00100/2019 (Fundação para a Ciência e a Tecnologia (FCT)).-
Descrição: dc.descriptioninfo:eu-repo/semantics/publishedVersion-
Idioma: dc.languageen-
Publicador: dc.publisherJournal of Chemical & Engineering Data-
Relação: dc.relationUID/QUI/00100/ 2013-
Relação: dc.relationUID/QUI/00100/2019-
Direitos: dc.rightsrestrictedAccess-
Palavras-chave: dc.subjectSalts-
Palavras-chave: dc.subjectViscosity-
Palavras-chave: dc.subjectLiquids-
Palavras-chave: dc.subjectIsotherms-
Palavras-chave: dc.subjectSolvents-
Palavras-chave: dc.subjectODS::09:Indústria, Inovação e Infraestruturas-
Título: dc.titleViscosity and density of two 1-alkyl-3-methyl-imidazolium triflate ionic liquids at high pressures: experimental measurements and the effect of alkyl chain length-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Aberto - Universidade Aberta (Portugal)

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