Thermal conductivity of deep eutectic solvents

  • Rajesh Kumar Gautam
  • Debabrata SethEmail author


We have reported the thermal conductivities of three deep eutectic solvents (DESs). We have used choline chloride, N,N-diethyl ethanol ammonium chloride and urea, N,N-diethylthiourea, to prepare three DESs. The thermal conductivities of three DESs have measured over the temperature range from 298 to 343 K at atmospheric pressure. We have observed that the thermal conductivities of DESs are slightly decreased with increase in temperature. In all systems, linear correlations were found between thermal conductivities with temperature. Out of three, DESs studied the thermal conductivities of DES-I (prepared from urea and choline chloride) and DES-II (prepared from urea and N,N-diethyl ethanol ammonium chloride) were found to be higher than some ionic liquids reported in the literature. We have measured the sound velocity of DES at 298 K. The trend of sound velocity in these three DESs is same as thermal conductivity. We have also reported viscosity of DES-III (prepared from thiourea and choline chloride) in the temperature range from 288 to 333 K.


Deep eutectic solvents Thermal conductivity Ultrasound velocity Thermophysical properties 

List of symbols


Diameter (m)


Temperature (K)


Ultrasonic frequency


Time (s)


Molar gas constant (J mol−1 K−1)


Constant heat rate



Deep eutectic solvent


Melting point (K)

Greek letters


Wavelength (nm)


Sound velocity (ms−1)


Viscosity of the medium (cP)


Thermal conductivity (W m−1 K−1)


Gradient (–)



All the authors are thankful to IIT Patna for research facilities. R.K.G also thanks U.G.C, New Delhi, for the research fellowship.


  1. 1.
    Abbott A, Capper G, Davies D, Rasheed R, Tambyrajah V. Novel solvent properties of choline chloride/urea mixtures. Chem Commun. 2003;70–1.
  2. 2.
    Smith EL, Abbott AP, Ryder KS. Deep eutectic solvents (DESs) and their applications. Chem Rev. 2014;114:11060–82. Scholar
  3. 3.
    Sarmad S, Xie Y, Mikkola J-P, Ji X. Screening of deep eutectic solvents (DESs) as green CO2 sorbents: from solubility to viscosity. New J Chem. 2017;41:290–301. Scholar
  4. 4.
    Zhang Q, Vigier KDO, Royer S, Jerome F. Deep eutectic solvents: syntheses, properties and applications. Chem Soc Rev. 2012;41:7108–46. Scholar
  5. 5.
    Shishov A, Bulatov A, Locatelli M, Carradori S, Andrich V. Application of deep eutectic solvents in analytical chemistry, a review. J Microchem. 2017;135:33–8. Scholar
  6. 6.
    Jhong HR, Wong DSH, Wan CC, Wang YY, Wei TC. A novel deep eutectic solvent-based ionic liquid used as an electrolyte for dye-sensitized solar cells. Electrochem Commun. 2009;11(1):209–11. Scholar
  7. 7.
    Wagle DV, Baker GA, Mamontov E. Differential microscopic mobility of components within a deep eutectic solvent. J Phys Chem Lett. 2015;6:2924–8. Scholar
  8. 8.
    Xu P, Zheng GW, Zong MH, Li N, Lou WY. Recent progress on deep eutectic solvents in biocatalysis. Bioresour Bioprocess. 2017;4–34.
  9. 9.
    Weaver KD, Kim JH, Sun J, Farlane DRM, Elliott GD. Cytotoxicity and biocompatibility of a family of choline phosphate ionic liquids design for pharmaceutical applications. Green Chem. 2010;12:507–13. Scholar
  10. 10.
    Mukesh C, Mondal D, Sharma M, Prasad K. Choline chloride–thiourea, a deep eutectic solvent for the production of chitin nanofibers. Carbohydr Polym. 2014;103:466–71. Scholar
  11. 11.
    Mondal D, Sharma M, Mukesh C, Gupta V, Prasad K. Improved solubility of DNA in recyclable and reusable bio-based deep eutectic solvents with long-term structural and chemical stability. Chem Commun. 2013;49:9606–8. Scholar
  12. 12.
    Bryant JS, Atkin R, Warr GG. Effect of deep eutectic solvent nanostructure on phospholipid bilayer phases. Langmuir. 2017;33:6878–84. Scholar
  13. 13.
    Shen Y, He X, Hung FR. Structural and dynamical properties of a deep eutectic solvent confined inside a slit pore. J Phys Chem C. 2015;119:24489–500. Scholar
  14. 14.
    Yadav A, Pandey S. Densities and viscosities of (choline chloride + urea) deep eutectic solvent and its aqueous mixtures in the temperature range 293.15 K to 363.15 K. J Chem Eng Data. 2014;59:2221–9. Scholar
  15. 15.
    Ali RHM, Ghobadi R, Matic S, Minofar B, Reha D. Solvation analysis of some solvatochromic probes in binary mixtures of reline, ethaline, and glyceline with DMSO. J Mol Liq. 2016;222:845–53. Scholar
  16. 16.
    Dai Y, Spronsen J, Witkamp GJ, Verpoorte R, Choi YH. Ionic liquids and deep eutectic solvents in natural products research: mixtures of solids as extraction solvents. J Nat Prod. 2013;76:2162–73. Scholar
  17. 17.
    Dragan TZ, Zoran BT, Dusica D-SR, Biljana DS, Vanja MT, Sandra SK, Vlada BV. The physicochemical and thermodynamic properties of the choline chloride-based deep eutectic solvents. J Serb Chem Soc. 2017;82(9):1039–52. Scholar
  18. 18.
    Naser J, Mjalli FS, Gano ZS. Molar heat capacity of tetrabutylammonium chloride-based deep eutectic solvents and their binary water mixtures. J Chem Eng. 2017;12:938–47. Scholar
  19. 19.
    Abbott AP, Boothby D, Capper G, Davies DL, Rasheed RK. Deep eutectic solvents formed between choline chloride and carboxylic acids: versatile alternatives to ionic liquids. J Am Chem Soc. 2004;126:9142–7. Scholar
  20. 20.
    Gautam RK, Ahmed SA, Seth D. Photophysics of thioflavin T in deep eutectic solvents. J Lumin. 2018;198:508–16. Scholar
  21. 21.
    Zhang K, Li H, Ren S, Wu W, Bao Y. Specific heat capacities of two functional ionic liquids and two functional deep eutectic solvents for the absorption of SO2. J Chem Eng Data. 2017;62:2708–12. Scholar
  22. 22.
    Mohsenzadeh A, Al-Wahaibi Y, Jibril A, Al-Hajri R, Shuwa S. The novel use of deep eutectic solvents for enhancing heavy oil recovery. J Pet Sci Eng. 2015;130:6–15. Scholar
  23. 23.
    Wua SH, Caparanga AR, Lerona RB, Li MH. Vapour pressure of aqueous choline chloride-based deep eutectic solvents (ethaline, glyceline, maline and reline) at 30–70 C. Thermochim Acta. 2012;54:41–5. Scholar
  24. 24.
    Harifi-Mood AR, Buchner R. Density, viscosity, and conductivity of choline chloride ethylene glycol as a deep eutectic solvent and its binary mixtures with dimethyl sulfoxide. J Mol Liq. 2017;225:689–95. Scholar
  25. 25.
    Shaabani A, Hooshmand SE, Afshari R, Shaabani S, Ghasemi V, Atharnezhad M, Akbari M. Direct construction of diverse metallophthalocyanines by manifold substrates in a deep eutectic solvent. J Solid State Chem. 2018;258:536–42. Scholar
  26. 26.
    Khan LA, Raza M, Mir NA, Ellahi R. Effects of different shapes of nanoparticles on peristaltic flow of MHD nanofluids filled in an asymmetric channel. J Therm Anal Calorim. 2019;1–12.
  27. 27.
    Ellahia R, Zeeshana A, Shehzada N, Alamrib SZ. Structural impact of kerosene-Al2O3 nanoliquid on MHD Poiseuille flow with variable thermal conductivity: application of cooling process. J Mol Liq. 2018;264:607–15. Scholar
  28. 28.
    Dolatabadi N, Rahmani R, Rahnejat H, Garner CP. Thermal conductivity and molecular heat transport of nanofluids. RSC Adv. 2019;9:2516–24. Scholar
  29. 29.
    Singh A, Walvekar R, Khalid M, Wong WY, Gupta TCSM. Thermophysical properties of glycerol and polyethylene glycol (PEG 600) based DES. J Mol Liq. 2018;252:439–44. Scholar
  30. 30.
    Chen Z, Ludwig M, Warr GG, Atkin R. Effect of cation alkyl chain length on surface forces and physical properties in deep eutectic solvents. J Colloid Interface Sci. 2017;494:373–9. Scholar
  31. 31.
    Baluja S, Lava D. Ultrasonic behavior of various chalcones in some solvents at different temperatures. Rev Colomb Cienc Quím Farm. 2016;45(3):339–61. Scholar
  32. 32.
    de Korte CL, Nillesen MM, Saris AECM, Lopata RGP, Thijssen JM, Kapusta L. New developments in paediatric cardiac functional ultrasound imaging. J Med Ultrasound. 2014;41:4279–90. Scholar
  33. 33.
    Iida Y, Tuziuti T, Yasui K, Towata A, Kozuka T. Control of viscosity in starch and polysaccharide solutions with ultrasound after gelatinization. Innov Food Sci Emerg Technol. 2008;9(2):140–6. Scholar
  34. 34.
    Victor R, Rubia M, Perez M. Upgrading the temperature-phased anaerobic digestion of waste activated sludge by ultrasonic pretreatment. J Eng Chem. 2015;259:672–81. Scholar
  35. 35.
    Ge R, Hardacre C, Nancarrow P, Rooney DW. Thermal conductivities of ionic liquids over the temperature range from 293 K to 353 K. J Chem Eng Data. 2007;52:1819–23. Scholar
  36. 36.
    Gardas RL, Ge R, Goodrich P, Hardacre C, Hussain A, Rooney DW. Thermophysical properties of amino acid-based ionic liquids. J Chem Eng Data. 2010;55:1505–15. Scholar
  37. 37.
    Rodil E, Arce A, Arce JA, Soto A. Measurements of the density, refractive index, electrical conductivity, thermal conductivity and dynamic viscosity for tributylmethylphosphonium and methylsulfate based ionic liquids. Thermochim Acta. 2018;664:81–90. Scholar
  38. 38.
    Zhao Y, Zhen Y, Jelle PB, Bostrom T. Measurements of ionic liquids thermal conductivity and thermal diffusivity. J Therm Anal Calorim. 2017;128:279–88. Scholar
  39. 39.
    Chandrasekar M, Suresh S, Bose AC. Experimental investigations and theoretical determination of thermal conductivity and viscosity of Al2O3/water nanofluid. Exp Therm Fluid Sci. 2010;34:210–6. Scholar
  40. 40.
    IEEE STD 442-1981. IEEE guide for soil thermal resistivity measurement Inc., 345 east 47 street, New York, NY 10017.Google Scholar
  41. 41.
    Saxena I, Pathak RN, Kumar V, Devi R. Introduction of the ultrasonic interferometer and experimental techniques for determination of ultrasonic velocity, density, viscosity and various thermodynamic parameters. Int J Appl Res. 2015;1(9):562–9. Scholar
  42. 42.
    Fröba AP, Rausch MH, Krzeminski K, Assenbaum D, Wasserscheid P, Leipertz A. Thermal conductivity of ionic liquids: measurement and prediction. Int J Thermophys. 2010;31:2059–77. Scholar
  43. 43.
    Valkenburg MEV, Vaughn RL, Williams M, Wilkes JS. Thermochemistry of ionic liquid heat-transfer fluids. Thermochem Acta. 2005;425:181–8. Scholar
  44. 44.
    Murphy T, Varela LM, Webber GB, Warr GG, Atkin R. Nanostructure–thermal conductivity relationships in protic ionic liquids. J Phys Chem B. 2014;118:12017–24. Scholar
  45. 45.
    Jabbar NMA, Mjalli FS. Ultrasonic study of binary aqueous mixtures of three common eutectic solvents. Phys Chem Liq. 2017;1–18.
  46. 46.
    Bridgman PW. The thermal conductivity of liquids. Proc Natl Acad Sci USA. 1923;9(10):341–5. Scholar
  47. 47.
    Rashin MN, Hemalatha J. A novel ultrasonic approach to determine thermal conductivity in CuO–ethylene glycol nanofluids. J Mol Liq. 2014;197:257–62. Scholar
  48. 48.
    Herreman W, Greyendonk W, Bock AD. Shear viscosity measurements of liquid carbon dioxide. J Chem Phys. 1970;53:185–9. Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of ChemistryIndian Institute of Technology PatnaPatnaIndia

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