TY - JOUR
T1 - Fluorination effects on the thermodynamic, thermophysical and surface properties of ionic liquids
AU - Vieira, Nicole S. M.
AU - Luís, Andreia
AU - Reis, P. M.
AU - Carvalho, Pedro Jorge
AU - Lopes-Da-Silva, José A.
AU - Esperança, J. M. S. S.
AU - Araújo, J. M. M.
AU - Rebelo, L. P. N.
AU - Freire, Mara G.
AU - Pereiro, A. B.
N1 - Fundacao para a Ciencia e a Tecnologia (FCT/MCTES) - SFRH/BD/100563/2014 ; SFRH/BPD/82264/2011 ; PTDC/EQU-FTT/118800/2010 ; PTDC/CTM-NAN/121274/2010 ; IF/00210/2014/CP1244/CT0003 ; UID/Multi/04551/2013 ; UID/CTM/50011/2013
European Research Council (ERC) - ERC-2013-StG-337753
FCT/MEC - RECI/BBB-BQB/0230/2012
PY - 2016/6/1
Y1 - 2016/6/1
N2 - This paper reports the thermal, thermodynamic, thermophysical and surface properties of eight ionic liquids with fluorinated alkyl side chain lengths equal or greater than four carbon atoms. Melting and decomposition temperatures were determined together with experimental densities, surface tensions, refractive indices, dynamic viscosities and ionic conductivities in a temperature interval ranging from (293.15 to 353.15) K. The surface properties of these fluorinated ionic liquids were discussed and several thermodynamic functions, as well as critical temperatures, were estimated. Coefficients of isobaric thermal expansion, molecular volumes and free volume effects were calculated from experimental values of density and refractive index and compared with previous data. Finally, Walden plots were used to evaluate the ionicity of the investigated ionic liquids.
AB - This paper reports the thermal, thermodynamic, thermophysical and surface properties of eight ionic liquids with fluorinated alkyl side chain lengths equal or greater than four carbon atoms. Melting and decomposition temperatures were determined together with experimental densities, surface tensions, refractive indices, dynamic viscosities and ionic conductivities in a temperature interval ranging from (293.15 to 353.15) K. The surface properties of these fluorinated ionic liquids were discussed and several thermodynamic functions, as well as critical temperatures, were estimated. Coefficients of isobaric thermal expansion, molecular volumes and free volume effects were calculated from experimental values of density and refractive index and compared with previous data. Finally, Walden plots were used to evaluate the ionicity of the investigated ionic liquids.
KW - Fluorinated ionic liquids
KW - Physical and thermal properties
KW - Surface tension
KW - Thermodynamic functions
KW - Walden plot
UR - http://www.scopus.com/inward/record.url?scp=84959305022&partnerID=8YFLogxK
U2 - 10.1016/j.jct.2016.02.013
DO - 10.1016/j.jct.2016.02.013
M3 - Article
AN - SCOPUS:84959305022
SN - 0021-9614
VL - 97
SP - 354
EP - 361
JO - Journal of Chemical Thermodynamics
JF - Journal of Chemical Thermodynamics
ER -