Thermophysical characterization of aqueous deep eutectic solvent (choline chloride/urea) solutions in full ranges of concentration at T= (293.15–323.15) K

Shekaari, Hemayat; Zafarani-Moattar, Mohammed Taghi; Mohammadi, Behrouz

doi:10.1016/j.molliq.2017.08.051

Cited by 106 publications

(69 citation statements)

References 39 publications

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“…The effect of charge shielding can be clearly seen when [N 8888 ]Cl is compared to [N 8881 ]Cl. Noteworthy are the extraordinarily low viscosities (less than 20 MPa s) of ES based on fatty acids and menthol, clearly overcoming one of the major drawbacks of hydrophilic DES, where for example a viscosity of 859.45 MPa s is attained for [Ch]Cl/urea (1:2) . The most fluid hydrophobic (D)ESs are C 12 /C 8 (1:3) and thymol/C 8 (1:1.4) with viscosities of 7.66 and 8 MPa s at 25 °C, respectively, comparable to other organic hydrophobic solvents (viscosity of heptane≈0.4 MPa s) …”

Section: Hydrophobic (Deep) Eutectic Solventsmentioning

confidence: 99%

“…Figure 10 shows 2). [25] The most fluid hydrophobic [8, 11a, 17a, 19, 21]. ChemSusChem 2019ChemSusChem , 12,1549ChemSusChem -1559 www.chemsuschem.org (D)ESs are C 12 /C 8 (1:3) and thymol/C 8 (1:1.4) with viscosities of 7.66 and 8MPa sa t2 5 8C, respectively,c omparable to other organic hydrophobic solvents (viscosity of heptane % 0.4 MPa s).…”

Section: Density and Viscosityofh Ydrophobic (D)essmentioning

confidence: 99%

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Quest for Green‐Solvent Design: From Hydrophilic to Hydrophobic (Deep) Eutectic Solvents

2019

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Deep eutectic solvents (DESs) consist of a mixture of two or more solid components, which gives rise to a lower melting point compared to the starting materials. Until recently only hydrophilic DESs were available, and despite their revolutionary role in the alternative‐solvents field, important issues in chemistry, and chemical engineering (such as water‐related problems and the replacement of toxic volatile organic compounds) could not be tackled. Hydrophobic (deep)—here in parenthesis due to the different depths of the eutectic melting points—eutectic solvents are a subclass of DESs where both components are hydrophobic. The low toxicity, high biodegradability, and straightforward preparation without further purification steps of naturally occurring low‐cost compounds are among the key advantages. Although research on hydrophobic DESs is scarce (the first report was only published in 2015), some interesting features and applications have been reported and deserve to be evaluated and comparisons established. This Minireview is divided into two parts: The first part provides a brief general introduction to DESs and the second part discusses the nomenclature using solid–liquid phase diagram analysis, chemical stability, thermophysical properties comparison, and finally the most important emerging fields of application.

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Section: Hydrophobic (Deep) Eutectic Solventsmentioning

confidence: 99%

Section: Density and Viscosityofh Ydrophobic (D)essmentioning

confidence: 99%

Quest for Green‐Solvent Design: From Hydrophilic to Hydrophobic (Deep) Eutectic Solvents

2019

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“…One mayor drawback for the implementation of these solvents in the industrial processes is the high viscosity values of the mostly of DESs [9]. However, this property can be modulated using the plasticizer effect of the water; the addition of small amounts increases substantially the fluidity of the liquid [22,23]. The hygroscopic capacity of several ChCl-based DESs has been studied by Chen et al [24].…”

Section: Introductionmentioning

confidence: 99%

NMR study of choline chloride-based deep eutectic solvents

Delso

Lafuente

Embid

et al. 2019

Journal of Molecular Liquids

109

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Nowadays, the eutectic liquids (DESs) are considered an adequate alternative to the traditional solvents. Therefore, there is an increasing interest in the study of the structure, properties and applications of these mixtures. In this paper, several NMR spectroscopic techniques have been used in order to evaluate the molecular structure of three ternary DESs, composed of choline chloride, urea or glycerol or ethylene glycol, and water. The use of routine and non-routine NMR techniques, such as 1 H, 13 C, correlation experiments, NOESY, ROESY, and diffusion experiments gave us some important evidences pointing to a supramolecular structure of the DES, which may be the origin of their particular behaviour. The mixture containing ethylene glycol shows the feeblest structure. In these ternary solvents, the water is found within the structure that is still retained when DESs are diluted at 10% wt.

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“…In this work, 420 speed of sound data were collected from literature references, covering 39 different DESs [21,[30][31][32][33][34][35][36][37][38][39][40][41][42]. Table 1 lists these 39 DESs, including their corresponding HBAs, HBDs and molar ratios.…”

Section: Selected Deep Eutectic Solvents (Dess) and Experimental Datamentioning

confidence: 99%

A Global Model for the Estimation of Speeds of Sound in Deep Eutectic Solvents

et al. 2020

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Deep eutectic solvents (DESs) are newly introduced green solvents that have attracted much attention regarding fundamentals and applications. Of the problems along the way of replacing a common solvent by a DES, is the lack of information on the thermophysical properties of DESs. This is even more accentuated by considering the dramatically growing number of DESs, being made by the combination of vast numbers of the constituting substances, and at their various molar ratios. The speed of sound is among the properties that can be used to estimate other important thermodynamic properties. In this work, a global and accurate model is proposed and used to estimate the speed of sound in 39 different DESs. This is the first general speed of sound model for DESs. The model does not require any thermodynamic properties other than the critical properties of the DESs, which are themselves calculated by group contribution methods, and in doing so, make the proposed method entirely independent of any experimental data as input. The results indicated that the average absolute relative deviation percentages (AARD%) of this model for 420 experimental data is only 5.4%. Accordingly, based on the achieved results, the proposed model can be used to predict the speeds of sound of DESs.

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Thermophysical characterization of aqueous deep eutectic solvent (choline chloride/urea) solutions in full ranges of concentration at T= (293.15–323.15) K

Cited by 106 publications

References 39 publications

Quest for Green‐Solvent Design: From Hydrophilic to Hydrophobic (Deep) Eutectic Solvents

Quest for Green‐Solvent Design: From Hydrophilic to Hydrophobic (Deep) Eutectic Solvents

NMR study of choline chloride-based deep eutectic solvents

A Global Model for the Estimation of Speeds of Sound in Deep Eutectic Solvents

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