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Thermodynamic Study of Amine-Based Deep Eutectic Solvents with H2O.

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The study measured the physical properties of deep eutectic solvents (DES) with water, revealing complex interactions and structural changes. Findings suggest potential for designing effective DES-based solvents for CO2 capture.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Deep eutectic solvents (DES) are emerging as tunable solvent platforms.
  • Understanding the physical properties and interactions of DES with other components is crucial for their application.
  • Water's influence on DES structure and properties requires detailed investigation.

Purpose of the Study:

  • To investigate the thermophysical properties (density, viscosity, enthalpy of mixing) of ([CnmimCl]-[MEA] + H2O) systems.
  • To elucidate the molecular interactions and structural rearrangements occurring upon water addition to DES.
  • To provide insights for the design of DES-based solvents for CO2 capture.

Main Methods:

  • Measurement of densities and viscosities across a temperature range (288.15–323.15 K).
  • Determination of enthalpies of mixing at different temperatures (298.15 and 308.15 K).
  • Analysis of composition dependence and correlation using the NRTL model.

Main Results:

  • Nonmonotonic density dependence with extrema observed, indicating enhanced molecular packing.
  • Viscosity showed sharp increases at low water content, with S-shape deviation profiles.
  • Negative enthalpies of mixing confirmed exothermic DES-H2O interactions, suggesting complex formation and ternary microstructure development.
  • Water addition reorganized hydrogen-bond networks, promoting MEA-H2O associations.

Conclusions:

  • The study reveals complex formation between DES constituents and water, leading to compact ternary structures.
  • Water significantly influences the hydrogen-bond network and solvent properties.
  • Findings provide molecular-level understanding for optimizing DES solvents in separation processes like CO2 capture.