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Concentrated Ionic Fluids: Is There a Difference Between Chloride-Based Brines and Deep Eutectic Solvents?

Guillaume Zante1, Christopher E Elgar1, Katherine George1

  • 1University of Leicester, College of Science and Engineering, Leicester, LE1 7RH, UK.

Angewandte Chemie (International Ed. in English)
|September 27, 2023
PubMed
Summary
This summary is machine-generated.

Deep Eutectic Solvents (DESs) and concentrated brines share properties, with charge transport linked to fluidity. Selective metal etching is achievable by controlling chloride and water activity in these ionic fluids.

Keywords:
BrinesDeep Eutectic SolventsElectrochemistryIonic LiquidsOxidation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Deep Eutectic Solvents (DESs) are novel solvents with tunable properties.
  • Concentrated aqueous brines also offer adjustable water and chloride ion activity.
  • Understanding the continuum of properties between these fluids is crucial for applications like metal processing.

Purpose of the Study:

  • To investigate the relationship between Deep Eutectic Solvents (DESs) and concentrated brines.
  • To demonstrate a continuum of properties across concentrated ionic fluids.
  • To explore the use of these fluids in selective metal etching.

Main Methods:

  • Investigated charge transport, molar conductivity, and fluidity in various concentrated ionic fluids.
  • Measured diffusion coefficients of iron(III) and copper(II) chloride.
  • Performed etching experiments on copper, silver, and nickel using these fluids.

Main Results:

  • Charge transport is governed by fluidity, showing no discontinuity across different ionic fluids.
  • Diffusion coefficients of metal chlorides linearly correlate with fluidity.
  • Selective etching of metals depends on chloride and water activity, with passivation occurring at higher water activity.

Conclusions:

  • Concentrated brines offer high chloride content and lower viscosity than DESs.
  • DESs are more effective at preventing passivation due to lower water content.
  • Tuning chloride and water activity allows for selective etching of mixed metal waste streams.