RT Journal Article
T1 Thermophysical properties of n‑alkyl‑ammonium nitrate ionic liquids  (n=2,3,4) pure and water saturated for energy applications
A1 Parajó Vieito, Juan José
A1 Vallet Moreno, Pablo
A1 García Guimarey, María Jesús
A1 Santiago Alonso, Antía
A1 Teijeira Pernas, Tamara
A1 Amigo Pombo, Alfredo José
A1 Varela Cabo, Luis Miguel
A1 Salgado Carballo, Josefa
A1 Villanueva López, María
K1 Ionic liquids
K1 Water content
K1 Transport properties
AB Phase transition temperatures of three ionic liquids (ILs) with ammonium cations of different alkyl chain length and nitrate common anion were determined in this paper by differential scanning calorimetry. Thermal stability of these ILs in air and nitrogen atmosphere and the maximum operation temperatures of the compounds were also studied using a thermogravimetric analyser. Furthermore, thermophysical properties as density, viscosity, thermal conductivity, and heat capacity against temperature of these pure ionic liquids were determined and compared with the corresponding values for water saturated samples. For this purpose, different techniques were employed: for density and viscosity a rotational automated viscodensimeter; for thermal conductivity measurements a thermal conductimeter that follows the transient hot-wire method; and for heat capacity measurements a microdifferential scanning calorimeter. Different behaviours were observed depending on the analysed thermophysical properties. In case of dried samples, density and thermal conductivity decrease with alkyl chain; for saturated samples, same tendency is observed for density but is the opposite in case of thermal conductivity. Isobaric specific heat and viscosity increase with alkyl chain length in case of dried samples; for saturated samples same tendency is observed for the viscosity, whereas the tendency is the contrary in case of isobaric specific heat
PB Springer
SN 1388-6150
YR 2023
FD 2023
LK http://hdl.handle.net/10347/30867
UL http://hdl.handle.net/10347/30867
LA eng
NO Parajó, J.J., Vallet, P., Guimarey, M.J.G. et al. Thermophysical properties of n-alkyl-ammonium nitrate ionic liquids (n = 2,3,4) pure and water saturated for energy applications. J Therm Anal Calorim 148, 6699–6714 (2023). https://doi.org/10.1007/s10973-023-12194-1
NO Authors acknowledge M. Gómez (RIAIDT-USC) for the technical support in DSC and TGA measurements. This work was supported by Spanish Ministry of Economy and Competitiveness and FEDER Program through the projects MAT2017-89239-C2-1-P, PID2020-112846RB-C22 as well as by Xunta de Galicia through GRC ED431C 2020/10 project and the Galician Network of Ionic Liquids (ReGaLIs) ED431D 2017/06. P. Vallet thanks funding support of FPI Program from Spanish Ministry of Science and J. J. Parajó and M. J. G. Guimarey thank the I2C postdoctoral Program of the Xunta de Galicia, for their support in funding the study. Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature
DS Minerva
RD 28 abr 2026