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Criticality of the [C(4)mim] [BF4] plus water system

Research output: Contribution in Book/Report/ProceedingsPaper

Published

Publication date2005
Host publicationIonic liquids III: fundamentals, progress, challenges, and opportunities
EditorsRobin D. Rogers, Kenneth R. Seddon
Place of publicationWashington, D. C.
PublisherAmerican Chemical Society
Pages175-186
Number of pages12
ISBN (Print)0-8412-3893-6
Original languageEnglish

Conference

ConferenceSymposium on Ionic Liquids - Fundamentals, Progress, Challenges and Opportunities held at the 226th American-Chemical-Society National Meeting
CityNew York
Period7/09/0311/09/03

Publication series

NameACS Symposium Series
PublisherAmerican Chemical Society
Volume901
ISSN (Print)0097-6156

Conference

ConferenceSymposium on Ionic Liquids - Fundamentals, Progress, Challenges and Opportunities held at the 226th American-Chemical-Society National Meeting
CityNew York
Period7/09/0311/09/03

Abstract

A study of the behavior of the response functions of the [C(4)mim][BF4] + water ionic binary solution near its liquid-liquid critical point at atmospheric pressure is presented. Phase equililibrium temperatures, which allow to obtain the critical coordinates of this system, are determined. Measurements of the isobaric heat capacity per unit volume in the critical region indicate Ising-like behavior. The slope of the critical line, (dT/dp)(c), is estimated by means of Prigogine and Defay's equation using experimentally determined excess volumes and excess enthalpies as a function of temperature. (dT/dp)(c) is found to be near zero. The consequences of this fact for the global critical behavior of second-order volumetric derivatives are discussed.