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Ionic Liquids as Thermal Energy Storage Materials: On the Importance of Reliable Data Analysis in Assessing Thermodynamic Data

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Abstract

In spite of many statements on the application potential of ionic liquids, these organic salts present both advantages and drawbacks for their possible use in real processes. Nevertheless, they are still an undeniably fascinating class of compounds, both from the fundamental point of view and as promising task-specific materials. For instance, reliable thermal property data seem to be significantly lacking for pure ionic liquids. In addition, to assess the application potential of any material or process, a reliable analysis of experimental data is of key importance, not only to obtain recommended data, but also to be able to identify patterns in structure–property relationships, even if those may not seem evident at first sight. The aim of this work is to assess the potential application of a series of 1-alkyl-3-methylimidazolium saccharinate ionic liquids (alkyl standing for butyl, hexyl, octyl, and decyl) in thermal energy storage. To this end, heat capacity and energy density were determined experimentally by means of differential scanning calorimetry (DSC) and oscillating-tube densitometry. The experimental data were then analyzed by means of advanced data analysis methods based on mathematical gnostics. Based on the thermodynamic data and theory of measurement, mathematical gnostics is a novel non-statistical approach towards data uncertainty. As such it enables us to evaluate measurement uncertainty of statistically non-significant data sets containing as few as four data points. Also, using robust regression algorithms along a gnostic influence function, functional dependencies and structure–property patterns can be reliably determined.

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Acknowledgements

The authors gratefully acknowledge the financial support of the Czech Science Foundation under Grant No. 17-08218S.

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Authors and Affiliations

  1. Institute of Chemical Process Fundamentals, CAS, v. v. i, Rozvojová 135/1, 165 02, Prague, Czech Republic

    Magdalena Bendová, Maja Čanji & Zdeněk Wagner

  2. Faculty of Chemistry and Pharmacy, Sofia University St Kliment Ohridski, 1 J. Bourchier Blvd, 1164, Sofia, Bulgaria

    Milen G. Bogdanov

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  1. Magdalena Bendová
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  2. Maja Čanji
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  4. Milen G. Bogdanov
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Correspondence to Magdalena Bendová.

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Bendová, M., Čanji, M., Wagner, Z. et al. Ionic Liquids as Thermal Energy Storage Materials: On the Importance of Reliable Data Analysis in Assessing Thermodynamic Data. J Solution Chem 48, 949–961 (2019). https://doi.org/10.1007/s10953-018-0798-9

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