BIBLIOS

Tipo
Artigos em Conferência

Tipo de Documento
Resumo

Título
Thermal Conductivity of Ionic Liquids. Experiment and Molecular Interpretation

Participantes na publicação
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

Resumo
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
Kenneth G. Kroenlein, Ala Bazyleva, Tara Fortin and Daniel G. Friend


Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Evento
22nd Symposium on Thermophysical Properties, June 23-28, 2024

Identificadores da Publicação

Local
Boulder, Colorado, USA

Organizadores
National Institute for Standards and Technology and Joint ASME AIChE Committee on Thermophysical Properties

Editora
National Institute of Standards and Technology

Coleção
Book of Abstracts (on-line)


Identificadores do Documento
URL - https://www.thermosymposium.org/pdf/73.pdf