Document type
Conference papers
Document subtype
Abstract
Title
Thermal Conductivity of Ionic Liquids. Experiment and Molecular Interpretation
Participants in the publication
Rafael M. Almeida (Author)
Dep. Química e Bioquímica
CQE
Hugo Santos (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Maria José V. Lourenço (Author)
Dep. Química e Bioquímica
CQE
Carlos A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE
Summary
Ionic liquids (ILs) are salts in the liquid state at room temperature with some relevant properties, namely their low vapor pressure over a large temperature range, and higher thermal conductivity than molecular fluids and molten salts. They are considered sustainable novel solvents in chemical technology for many applications, making them possible candidates for heat transfer and storage applications. \nAmong all known ILs, the ones with imidazolium-based cations are the most studied, given their safety, low cost, low viscosity, and for some of them, low toxicity and biodegradability. Recent efforts to recommend reference values for the thermophysical properties of an IUPAC standard ionic liquid, [C6mim][(CF3SO2)2N], showed that there are still problems in experimental data. As so, there is a need to fully understand their properties at a molecular/ionic level to understand the thermal conduction in these ionic liquids. \nThis work analyses recent work on the thermal conductivity of pure ionic liquids, reporting new data for three of them, [C4mim][(N(CN)2], [C6mim][(N(CN)2] and [C2mim][SCN], while analyzing the effect of the cation and anion on the macroscopic thermal conductivity. The thermal conductivity was measured with a transient hot-wire probe, in the temperature range 303.15 K < T < 348.15 K, with an estimated expanded uncertainty Ur (λ) = 0.02. \nRegularities of molecular mass and scaled volumes dependence on the effect of anion and cation on the thermal conductivity of the ionic liquids studied are discussed, as well as the limitations of existing of approximate theoretical methods for the calculation of thermal conductivity, namely the Bridgman model.
Editor(s)
Kenneth G. Kroenlein, Ala Bazyleva, Tara Fortin and Daniel G. Friend
Date of Publication
2024-06-23
Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Event
22nd Symposium on Thermophysical Properties, June 23-28, 2024
Publication Identifiers
Address
Boulder, Colorado, USA
Organizers
National Institute for Standards and Technology and Joint ASME AIChE Committee on Thermophysical Properties
Publisher
National Institute of Standards and Technology
Collection
Book of Abstracts (on-line)
Document Identifiers
URL -
https://www.thermosymposium.org/pdf/73.pdf