Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/10338
DC Field | Value | Language |
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dc.contributor.author | Najdanovic-Visak, Vesna | - |
dc.contributor.author | Esperança, José M. S. S. | - |
dc.contributor.author | Rebelo, Luís P. N. | - |
dc.contributor.author | Ponte, Manuel Nunes da | - |
dc.contributor.author | Guedes, Henrique J. R. | - |
dc.contributor.author | Seddon, Kenneth R. | - |
dc.contributor.author | Sousa, Hermínio C. de | - |
dc.contributor.author | Szydlowski, Jerzy | - |
dc.date.accessioned | 2009-06-25T08:56:37Z | - |
dc.date.available | 2009-06-25T08:56:37Z | - |
dc.date.issued | 2003-11-20 | - |
dc.identifier.citation | The Journal of Physical Chemistry B. 107:46 (2003) 12797-12807 | en_US |
dc.identifier.issn | 1520-6106 | - |
dc.identifier.uri | https://hdl.handle.net/10316/10338 | - |
dc.description.abstract | Liquid−liquid phase splitting in ternary mixtures that contain a room-temperature ionic liquid and an alcohol aqueous solutionnamely, [bmim][PF6] + ethanol + water and [bmim][NTf2] + 2-methylpropanol + wateris studied. Experimental cloud-point temperatures were obtained up to pressures of 400 bar, using a He−Ne laser light-scattering technique. Although pressurization favors mutual miscibility in the presence of high concentrations of alcohols, the contrary occurs in water-rich solutions. Both ternary mixtures exhibit a very pronounced water−alcohol co-solvent effect. Solvent isotope effects are also investigated. Phase diagrams are discussed using a phenomenological approach based on a “polymer-like” GE model coupled with the statistical−mechanical theory of isotope effects. The combined effect of a red shift of −15 cm-1 for the O−H deformation mode of ethanol with a blue shift of +35 cm-1 for the O−H stretching mode, both of which occurring after liquid infinite dilution in the ionic liquid, rationalizes the observed isotope effect in the phase diagram. Predicted excess enthalpy (HE) values are inferred from the model parameters. Furthermore, using the Prigogine−Defay equation, an estimation of the excess volumes (VE) is obtained. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | American Chemical Society | en_US |
dc.rights | openAccess | eng |
dc.title | Pressure, Isotope, and Water Co-solvent Effects in Liquid−Liquid Equilibria of (Ionic Liquid + Alcohol) Systems | en_US |
dc.type | article | en_US |
dc.identifier.doi | 10.1021/jp034576x | - |
item.fulltext | Com Texto completo | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.languageiso639-1 | en | - |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
crisitem.author.researchunit | CIEPQPF – Chemical Process Engineering and Forest Products Research Centre | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.orcid | 0000-0002-2629-7805 | - |
Appears in Collections: | FCTUC Eng.Química - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
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Pressure, Isotope, and Water Co-solvent Effects.pdf | 147.55 kB | Adobe PDF | View/Open |
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