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Sub-μL measurements of the thermal conductivity and heat capacity of liquids

Abstract

We present the analysis of the thermal conductivity, k, and heat capacity, Cp, of a wide variety of liquids, covering organic molecular solvents, ionic liquids and water-polymer mixtures. These data were obtained from 0.6 μL samples, using an experimental development based on the 3ω method, capable of the simultaneous measurement of k and Cp. In spite of the different type and strength of interactions, expected in a priori so different systems, the ratio of k to the sound velocity is approximately constant for all of them. This is the consequence of a similar atomic density for all these liquids, notwithstanding their different molecular structure. This was corroborated experimentally by the observation of a Cp/V∼1.89x106 JK-1m-3 (∼3R/2 per atom), for all liquids studied in this work. Finally, the very small volume of sample required in this experimental method is an important advantage for the characterization of systems like nanofluids, in which having a large amount of dispersed phase is sometimes extremely challenging.

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Publication details

The article was received on 09 Jan 2018, accepted on 08 Feb 2018 and first published on 08 Feb 2018


Article type: Paper
DOI: 10.1039/C8CP00165K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Sub-μL measurements of the thermal conductivity and heat capacity of liquids

    C. López-Bueno, D. Bugallo, V. Leborán Alvarez and F. Rivadulla, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP00165K

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