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Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
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A Theoretical Study on Terpene-Based Natural Deep Eutectic Solvent: Relationship between Viscosity and
Chen Fan1, Yang Liu1, Tarik Sebbah1
1Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Technology and Business University No. 11 Fucheng Road Beijing 100048 China.
Global Challenges (Hoboken, NJ)
|March 17, 2021
Summary
The viscosity of natural deep eutectic solvents (NADES) is linked to hydrogen bond strength and stability. Understanding these interactions aids in designing novel, low-viscosity NADES for various applications.
Area of Science:
- Physical Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Natural deep eutectic solvents (NADES) exhibit unique properties influenced by intermolecular interactions.
- Terpene-based NADES are gaining attention for their potential applications.
- Viscosity is a critical parameter affecting NADES performance, but its origins in these systems are not fully understood.
Purpose of the Study:
- To investigate the relationship between viscosity and hydrogen-bonding interactions in terpene-based NADES.
- To elucidate the structural factors governing the viscosity of these solvents.
- To establish rules for designing low-viscosity NADES.
Main Methods:
- Preparation and characterization of five terpene-based NADES systems (camphor/formic acid, menthol/acetic acid, menthol/β-citronellol, menthol/lactic acid, thymol/β-citronellol) at a 1:1 molar ratio.
- Investigation of hydrogen bond networks using multiple theoretical and experimental methods.
- Analysis of non-covalent interactions and correlation with measured viscosity.
Main Results:
- NADES viscosity correlates with the product of hydrogen bond number and lifetime.
- Terpene-acid NADES with single hydrogen bond sites exhibited the lowest viscosity due to weak interactions.
- Multi-site terpene-acid and terpene-terpene NADES showed higher viscosity, attributed to stronger and more stable hydrogen bonds.
- Hydrogen bonds were classified as weak to medium, primarily electrostatic, with a direct link to viscosity.
Conclusions:
- Hydrogen bonding characteristics are key determinants of viscosity in terpene-based NADES.
- The number and stability of hydrogen bonds significantly influence solvent viscosity.
- This study provides fundamental insights for the rational design of low-viscosity NADES.
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