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Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
Ethaline deep eutectic solvent under nanoconfinement: Unveiling structural and dynamical changes
Mohammad Nadim Kamar1, Armin Mozhdehei1, Ronan Lefort1
1Institute of Physics of Rennes, CNRS-University of Rennes, UMR 6251, F-35042 Rennes, France.
The Journal of Chemical Physics
|July 23, 2026
Summary
Nanoconfinement of deep eutectic solvents (DESs) like ethaline in porous silica materials preserves structure and dynamics. Molecular motion shows slight changes, with increased residence times but preserved trajectories, indicating robust performance in hybrid nanomaterials.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Hybrid nanomaterials integrating deep eutectic solvents (DESs) are promising for diverse applications.
- Nanoconfinement effects, including interfacial interactions and spatial restrictions, can significantly alter DES properties.
- Understanding these effects is crucial for optimizing DES performance in confined environments.
Purpose of the Study:
- To investigate the impact of nanoconfinement on the structure and molecular dynamics of ethaline, a common DES.
- To compare the behavior of ethaline confined in SBA-15 and MCM-41 silica mesopores with varying pore sizes.
- To elucidate how confinement influences the translational and localized motions of DES molecules.
Main Methods:
- Neutron diffraction was employed to analyze the structural homogeneity of confined ethaline.
- Quasielastic neutron scattering (QENS) was used to probe the molecular dynamics, including translational diffusion and localized motion.
- Ethaline was confined within mesoporous silica materials: SBA-15 (≈8.1 nm pores) and MCM-41 (≈3.5 nm pores).
Main Results:
- Ethaline remained structurally homogeneous within both SBA-15 and MCM-41 pores, with no phase segregation observed.
- Translational diffusion followed a jump-diffusion mechanism, with diffusion coefficients close to bulk values, slightly reduced in MCM-41.
- Residence times between translational jumps increased significantly (3-8x in SBA-15, up to 10x in MCM-41), and localized motion relaxation times increased (∼20% in SBA-15, up to 50% in MCM-41).
Conclusions:
- Nanoconfinement does not disrupt the structural integrity or fundamental dynamic characteristics of ethaline.
- While residence times and localized motion are affected, the overall molecular trajectories and diffusion mechanisms are largely preserved.
- These findings suggest that DESs like ethaline can maintain their functional properties within porous nanomaterials, supporting their use in advanced applications.
