Properties and thermal behavior of natural deep eutectic solvents

R. Craveiro, I. Aroso, V. Flammia, M. T. Viciosa, Maria Madalena Alves Campos de Sousa Dionísio Andrade, S. Barreiros

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Natural deep eutectic solvents (NADES) have shown to be promising sustainable media for a wide range of applications. Nonetheless, very limited data is available on the properties of these solvents. A more comprehensive body of data on NADES is required for a deeper understanding of these solvents at molecular level, which will undoubtedly foster the development of new applications. NADES based on choline chloride, organic acids, amino acids and sugars were prepared, and their density, thermal behavior, conductivity and polarity were assessed, for different NADES compositions. The NADES studied can be stable up to 170°C, depending on their composition. The thermal characterization revealed that all the NADES are glass formers and some, after water removal, exhibit crystallinity. The morphological characterization of the crystallizable materials was performed using polarized optical microscopy which also provided evidence of homogeneity/phase separation. The conductivity of the NADES was also assessed from 0 to 40°C. The more polar, organic acid-based NADES presented the highest conductivities. The conductivity dependence on temperature was well described by the Vogel-Fulcher-Tammann equation for some of the NADES studied.

Original languageEnglish
Pages (from-to)534-540
Number of pages7
JournalJournal of Molecular Liquids
Volume215
DOIs
Publication statusPublished - 1 Mar 2016

Fingerprint

eutectics
Eutectics
conductivity
Organic acids
Amino sugars
Hot Temperature
Amino Sugars
choline
acids
sugars
Choline
Chemical analysis
Phase separation
Optical microscopy
homogeneity
amino acids
Amino acids
crystallinity
polarity
chlorides

Keywords

  • Choline chloride
  • Conductivity
  • Deep eutectic solvents
  • Physical properties
  • Thermal analysis

Cite this

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abstract = "Natural deep eutectic solvents (NADES) have shown to be promising sustainable media for a wide range of applications. Nonetheless, very limited data is available on the properties of these solvents. A more comprehensive body of data on NADES is required for a deeper understanding of these solvents at molecular level, which will undoubtedly foster the development of new applications. NADES based on choline chloride, organic acids, amino acids and sugars were prepared, and their density, thermal behavior, conductivity and polarity were assessed, for different NADES compositions. The NADES studied can be stable up to 170°C, depending on their composition. The thermal characterization revealed that all the NADES are glass formers and some, after water removal, exhibit crystallinity. The morphological characterization of the crystallizable materials was performed using polarized optical microscopy which also provided evidence of homogeneity/phase separation. The conductivity of the NADES was also assessed from 0 to 40°C. The more polar, organic acid-based NADES presented the highest conductivities. The conductivity dependence on temperature was well described by the Vogel-Fulcher-Tammann equation for some of the NADES studied.",
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Properties and thermal behavior of natural deep eutectic solvents. / Craveiro, R.; Aroso, I.; Flammia, V.; Viciosa, M. T.; Andrade, Maria Madalena Alves Campos de Sousa Dionísio; Barreiros, S.

In: Journal of Molecular Liquids, Vol. 215, 01.03.2016, p. 534-540.

Research output: Contribution to journalArticle

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