Thermophysical characterization of the deep eutectic solvent choline chloride:ethylene glycol and one of its mixtures with water

Lapeña, David; Lomba, Laura; Artal, Manuela; Lafuente, Carlos; Giner, Beatriz

doi:10.1016/j.fluid.2019.03.018

Cited by 102 publications

(69 citation statements)

References 35 publications

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“…As shown on Fig. 3, the density, viscosity and conductivity values of ethaline are close to some of those reported in the literature [16][17][18][19][20][21]. For a better comparison, the values (from this study and from the literature) of the physicochemical parameters of ethaline have been presented in Table S1.…”

Section: Physicochemical Propertiessupporting

confidence: 84%

“…For a better comparison, the values (from this study and from the literature) of the physicochemical parameters of ethaline have been presented in Table S1. As previously mentioned by some previous work [18,22], a disparity in the thermophysical properties of DES exists by comparing the different values even from a same group of researchers. This discrepancy can be due to the operating conditions or the water content into the mixtures.…”

Section: Physicochemical Propertiesmentioning

confidence: 95%

“…Variations of (a) the density, (b) the viscosity, (c) the conductivity and (d) the logarithm of the density as a function of the temperature of the DESs -ethaline (blue squares); ethaline from ref [18]. (black circles); and DES-Menthol (red triangles).The dynamic viscosity, , defines the internal resistance of a fluid to a shear stress.…”

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confidence: 99%

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New hydrophobic deep eutectic solvent for electrochemical applications

Chaabene

Ngo

Turmine

et al. 2020

Journal of Molecular Liquids

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Deep eutectic solvents (DESs) are known as cheap and biodegradable solvents which are easier to synthesize than ionic liquids (ILs). In this work, a new hydrophobic DES based on menthol is described. It consisted in a mixture of menthol and acetic acid in which ethanolamine has been added in order to increase the conductivity up to few mS.cm-1. The physicochemical properties as a function of temperature, in the range of 293 to 333 K, of this menthol-based DES have been compared to the ethaline, which is one of the most widely used DES. Cyclic voltammetry has been used to study the electrochemical behavior of an electroactive mediator, the hydroxymethylferrocene (FcMeOH), which is a reversible electrochemical system and its diffusion coefficient, determined in both DESs, is of the same order of magnitude than the one reported for the 1-ethyl-3-methylimidazolium bis(trifluoro-methanesulfonyl)imide (EMIMTFSI), which is the most widely used IL for electrochemical applications. This new class of DES thus provide an eco-friendly alternative for electrochemical applications.

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Section: Physicochemical Propertiessupporting

confidence: 84%

Section: Physicochemical Propertiesmentioning

confidence: 95%

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New hydrophobic deep eutectic solvent for electrochemical applications

Chaabene

Ngo

Turmine

et al. 2020

Journal of Molecular Liquids

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“…The integrity of DES could be destroyed in biphasic aqueous systems, while its local arrangement could be preserved in single-phase aqueous DES mixtures up to a moderate degree of hydration [1,11]. The physical properties of water-ionic liquids and water-DES mixtures, including excess properties, viscosity, acoustic, structural and optical properties have been studied around ambient temperature and above [1,[12][13][14][15][16][17][18][19].…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Phase behavior of aqueous solutions of ethaline deep eutectic solvent

Jani

Sohier

Morineau

2020

Journal of Molecular Liquids

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We have established a detailed phase diagram of a prototypical DES as a function of the hydration level. Two distinct thermal phase behaviors are observed depending on the water content with respect to a cross-over composition W g ' = 30%. For W < W g ', the formation of ice is not observed under the experimental conditions used in this study, and the solution falls in the category of glassforming systems. Fully vitreous states could also be obtained between 30% and 50%, but they are metastable with respect to water crystallization. For W > W g ', ice crystallization occurs but the residual DES solution remains amorphous (liquid or glassy). In the latter case, whatever the initial water fraction, this transformation finally ends at the fixed composition W g ' corresponding to 6 to 10 water molecules per choline ion for the two studied DESs. We infer that the residual liquid water molecules forming this maximally freeze-concentrated solution are strongly interacting with DES molecular units. This situation is also known as the "water-in-DES" case. Conversely, ice crystallization concerns free water molecules, provided that W > W g ', also known as the "DES-in-water" case. This entire phase behavior is explained in the context of maximally freeze-concentrated solutions and attributed to the concomitant effects of ice freezing depression, glassforming ability of weakly hydrated DES Journal Pre-proof J o u r n a l P r e-p r o o f 2 (W < W g ') and water structure distortion. This study also highlights the potential of DESs for their uses in freeze-drying processes and biopreservative applications.

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“…Longer equilibration time in comparison with DMF solutions was examined because of the lower equilibration temperature applied and because of the bigger viscosity of the matrix medium. For comparison, at 20°C viscosity of DMF is 0.92 mPa s and that of ChCl-Eg is 48.95 mP s [22]. The results demonstrated (Fig.…”

Section: Operation Conditionsmentioning

confidence: 81%

Headspace gas chromatographic analysis of residual solvents in pharmaceuticals: comparison of two matrix media

Vičkačkaitė¹,

Jevtuch²,

Poškus³

et al. 2020

chemija

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Dimethylformamide (DMF) and a deep eutectic solvent choline chloride-ethylene glycol (ChCl-Eg) were investigated as potential matrix media for static headspace gas chromatographic (SHS-GC) determination of residual solvents in pharmaceuticals. Sample equilibration temperature, equilibration time and injection time were optimized. In the case of DMF 140°C equilibration temperature was applied. For ChCl-Eg equilibration temperature could not exceed 80°C as ChCl-Eg started to degrade at elevated temperatures. The higher equilibration temperature of DMF solutions favoured a transition of the analytes to the headspace and consequently resulted in lower detection limits of the analytes. Thus DMF has been considered a more suitable matrix medium than ChCl-Eg and was applied for the SHS-GC determination of residual solvents in pharmaceuticals.

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Thermophysical characterization of the deep eutectic solvent choline chloride:ethylene glycol and one of its mixtures with water

Cited by 102 publications

References 35 publications

New hydrophobic deep eutectic solvent for electrochemical applications

New hydrophobic deep eutectic solvent for electrochemical applications

Phase behavior of aqueous solutions of ethaline deep eutectic solvent

Headspace gas chromatographic analysis of residual solvents in pharmaceuticals: comparison of two matrix media

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