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Multiple-Stimuli-Responsive Surfactant-Free Microemulsions Based on Hydrophobic Deep Eutectic Solvents.
Junhao Jing1, Jie Qi1, Yang Yang1
1College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China.
Summary
Researchers developed a novel CO2-responsive hydrophobic deep eutectic solvent (HDES) microemulsion. This system offers tunable droplet size and phase behavior with temperature and CO2, enabling reversible changes without demulsification.
Area of Science:
- Colloid and Surface Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Hydrophobic deep eutectic solvents (HDESs) are emerging as versatile components in colloidal systems like microemulsions.
- The development of stimulus-responsive HDESs, particularly for applications in microemulsions, remains an area of active research.
- Existing HDES applications often lack dynamic responsiveness to external stimuli such as CO2 or temperature.
Purpose of the Study:
- To synthesize and characterize a novel CO2-responsive hydrophobic deep eutectic solvent (HDES) using menthol and indole.
- To investigate the formation and properties of a surfactant-free microemulsion utilizing the synthesized HDES.
- To explore the responsiveness of this microemulsion to carbon dioxide (CO2) and temperature variations.
Main Methods:
- Synthesis of HDES by hydrogen bonding menthol and indole.
- Formation of a ternary microemulsion system with HDES, water, and ethanol.
- Characterization using Dynamic Light Scattering (DLS), conductivity, and polarity probing techniques.
- Ternary phase diagram analysis to map phase behavior under different conditions.
Main Results:
- A CO2- and temperature-responsive, surfactant-free microemulsion was successfully created using the menthol-indole HDES.
- Dynamic Light Scattering confirmed the microemulsion's single-phase region and allowed for precise, reversible control over droplet size via temperature.
- Significant phase inversion was observed with minor temperature fluctuations, and the system demonstrated stability during CO2/N2 responsiveness tests, forming a clear aqueous solution.
Conclusions:
- The menthol-indole HDES forms a stable, stimulus-responsive microemulsion with tunable properties.
- Temperature and CO2 act as effective triggers for controlling microemulsion phase behavior and droplet size.
- This system presents a promising platform for applications requiring reversible and controllable colloidal structures.
