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Viscosity measurements on Ionic liquids : a cautionary tale

dc.contributor.authorDiogo, João C. F.
dc.contributor.authorCaetano, Fernando J. P.
dc.contributor.authorFareleira, João M. N. A.
dc.contributor.authorWakeham, William A.
dc.date.accessioned2015-01-15T14:12:02Z
dc.date.available2015-01-15T14:12:02Z
dc.date.issued2014-10
dc.description.abstractThe vibrating-wire viscometer has proven to be an exceedingly effective means of determining the viscosity of liquids over a wide range of temperature and pressure. The instrument has a long history but a variety of technological and theoretical developments over a number of years have improved its precision and most recently have enabled absolute measurements of high accuracy. However, the nature of the electrical measurements required for the technique has inhibited its widespread use for electrically conducting liquids so that there have been only a limited number of measurements. In the particular context of ionic liquids, which have themselves attracted considerable attention, this is unfortunate because it has meant that one primary measurement technique has seldom been employed for studies of their viscosity. In the last 2 years systematic efforts have been made to explore the applicability of the vibrating-wire technique by examining a number of liquids of increasing electrical conductivity. These extensions have been successful. However, in the process we have had cause to review previous studies of the viscosity and density of the same liquids at moderate temperatures and pressures and significant evidence has been accumulated to cause concern about the application of a range of viscometric techniques to these particular fluids. Because the situation is reminiscent of that encountered for a new set of environmentally friendly refrigerants at the end of the last decade, in this paper the experimental methods employed with these liquids have been reviewed which leads to recommendations for the handling of these materials that may have consequences beyond viscometric measurements. In the process new viscosity and density data for 1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide [C6mim][NTf2], 1-ethyl-3-methylimidazolium ethyl sulfate [C2mim][EtSO4], and 1-ethyl-3-methylpyridinium ethyl sulfate [C2mpy][EtSO4] have been obtained.por
dc.identifier.citationDiogo, João C. F. [et al.] - Viscosity measurements on Ionic liquids : a cautionary tale. "International Journal of Thermophysics". ISSN 0195-928X (Print) 1572-9567 (Online). Vol. 35, nº 9-10 (oct. 2014), p 1615-1635por
dc.identifier.doi10.1007/s10765-013-1487-y
dc.identifier.issn0195-928X
dc.identifier.urihttp://hdl.handle.net/10400.2/3592
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherInt J Thermophyspor
dc.relation.publisherversionhttp://link.springer.com/article/10.1007%2Fs10765-013-1487-ypor
dc.subjectViscositypor
dc.subjectIonic liquidspor
dc.subject[C2mim][EtSO4]por
dc.subject[C2mpy][EtSO4]por
dc.subject[C6mim][NTf2]por
dc.titleViscosity measurements on Ionic liquids : a cautionary talepor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1635por
oaire.citation.startPage1615por
oaire.citation.titleInt J Thermophyspor
oaire.citation.volume35por
person.familyNameCaetano
person.familyNameFareleira
person.givenNameFernando J. P.
person.givenNameJoão
person.identifier.ciencia-idDE17-708E-317F
person.identifier.ciencia-id8E1B-F54C-8ABD
person.identifier.orcid0000-0002-6821-1694
person.identifier.orcid0000-0002-8442-9386
person.identifier.ridH-8325-2012
person.identifier.scopus-author-id7004474824
person.identifier.scopus-author-id6603840268
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationf36ab422-62f8-4432-965c-73e36b0d25a2
relation.isAuthorOfPublication22e737b9-e5ab-460d-9200-5d088c622c08
relation.isAuthorOfPublication.latestForDiscoveryf36ab422-62f8-4432-965c-73e36b0d25a2

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