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Molecular Forces in Liquid-Liquid Extraction.

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Phase transfer of ions in solvent extraction is driven by chemical potential gradients, combining short-range complexation forces with nanoscale organization. This ienaics approach quantifies extraction free energy by considering spatial partitioning and interfacial interactions.

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Area of Science:

  • Chemical Engineering
  • Physical Chemistry
  • Supramolecular Chemistry

Background:

  • Ion phase transfer is governed by chemical potential gradients, encompassing molecular forces and entropy.
  • Solvent extraction involves high-energy, short-range interactions (ion pairing, complexation) and supramolecular/nanoscale organization.
  • Modeling is complex due to coupled domains and low free energy of extraction (around kBT) for reversibility.

Purpose of the Study:

  • To present and validate the ienaics approach for modeling complex solvent extraction systems.
  • To rationalize the free energy of transfer by integrating various energetic and entropic contributions.
  • To demonstrate the applicability of the ienaics approach beyond solvent extraction.

Main Methods:

  • Quantification by partitioning space into polar cores, interfacial film, and solvent.
  • Rationalizing free energy using terms for complexation energies, entropic effects, and solute confinement.
  • Applying the ienaics approach to solvent extraction systems and other ionic interfaces.

Main Results:

  • The ienaics approach successfully models the coupled domains in solvent extraction.
  • Free energy of transfer is explained by a combination of complexation, entropy, and nanoconfinement effects.
  • The methodology is adaptable for analyzing membranes and biological interfaces.

Conclusions:

  • The ienaics approach provides a robust framework for understanding ion phase transfer in solvent extraction.
  • It integrates molecular-level forces with nanoscale organization for accurate free energy calculations.
  • This methodology has broad implications for various ionic systems, including biological interfaces.