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Preparation of Binary and Ternary Deep Eutectic Systems
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Long-Range Electrostatic Colloidal Interactions and Specific Ion Effects in Deep Eutectic Solvents.

Adrian Sanchez-Fernandez1, Andrew J Jackson2,3, Sylvain F Prévost4

  • 1Food Technology, Engineering and Nutrition, Lund University, Box 124, 221 00 Lund, Sweden.

Journal of the American Chemical Society
|August 30, 2021
PubMed
Summary
This summary is machine-generated.

In deep eutectic solvents, electrostatic correlations are strong even at high ion concentrations, revealing long-range repulsions between micelles. Specific ion effects, like those in the Hofmeister series, influence micelle behavior.

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Area of Science:

  • Physical Chemistry
  • Colloid Science
  • Materials Science

Background:

  • Traditional theories suggest weak electrostatic interactions at high ion concentrations.
  • Deep eutectic solvents (DES) possess intrinsically high ion concentrations (>2.5 M).
  • Understanding intermicellar interactions in DES is crucial for their applications.

Purpose of the Study:

  • To investigate intermicellar interactions in choline chloride:glycerol and choline bromide:glycerol deep eutectic solvents.
  • To determine the role of electrostatic correlations and specific ion effects in these systems.
  • To challenge the traditional view on electrostatic interactions in high-ionic-strength media.

Main Methods:

  • Small-angle neutron scattering (SANS) was employed to study micelle structures and interactions.
  • Two specific deep eutectic solvent mixtures (1:2 choline chloride:glycerol and 1:2 choline bromide:glycerol) were analyzed.
  • Analysis focused on intermicellar distances and repulsive forces.

Main Results:

  • Evidence of long-range electrostatic repulsions between charged colloidal particles (micelles) was observed in the studied DES.
  • Micelle morphology and electrostatic interactions were significantly modulated by counterion condensation.
  • These modulations aligned with trends predicted by the Hofmeister series, indicating specific ion effects.

Conclusions:

  • Electrostatic correlations play a dominant role in intermicellar interactions within DES, contrary to traditional assumptions.
  • Specific ion effects, driven by counterion condensation, are significant even at high bulk ion concentrations.
  • Ion-ion correlations reduce the effective ionic strength, explaining observed phenomena in DES.