The effect of water on the thermal conductivities of deep eutectic solvents (choline chloride plus ethylene glycol) using two-wire structure 3x method

The advantages of deep eutectic solvent (DES), such as non-toxic, non-flammable, low vapor pressure and low cost, make it a green solvent for capturing carbon dioxide. Adding water can change the nanostructures of DES and thus significantly influent the physical and chemical properties. At present, most researches focus on the theoretical study while few experimental studies on the effect of water on the thermal conductivity of DES. In this paper, the 3 omega experimental system was improved using a two wire structure to eliminate the end effect and measured the thermal conductivities of the DES composed of choline chloride and ethylene glycol and its aqueous solution to study the effect of water on the thermal conductivities. The uncertainty of thermal conductivity is less than 4%. The second-order Scheffe polynomial was modified to make it more suitable for fitting the thermal conductivities of the mixtures containing DES. The average absolute relative deviation calculated by the equation is 2.16%, which corroborates the high accuracy of the improved equation. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

The advantages of deep eutectic solvent (DES), such as non-toxic, non-flammable, low vapor pressure, and low cost, make it a green solvent for capturing carbon dioxide. This paper focuses on the effect of water on the thermal conductivities of DES. An improved experimental system was used to measure the thermal conductivities of DES and its aqueous solution, revealing the impact of water on the thermal conductivities. The results show high accuracy and provide valuable insights for further research in this field.