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Ion Pairing and Molecular Orientation at Liquid/Liquid Interfaces: Self-Assembly and Function.

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Molecular orientation at oil/water interfaces changes with salt addition. Ion effects alter oligomer self-assembly, impacting functional interface design for separations and biomimetic systems.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Supramolecular Chemistry

Background:

  • Molecular orientation is crucial for interface functionality but difficult to measure.
  • Buried liquid/liquid interfaces present unique challenges for experimental probing.
  • Supramolecular assemblies at interfaces are key to novel functions.

Purpose of the Study:

  • To investigate molecular orientations at buried oil/aqueous interfaces.
  • To understand how salt addition affects self-assembled oligomer structures.
  • To elucidate the mechanisms behind salt-induced orientational changes.

Main Methods:

  • Vibrational sum-frequency generation (VSFG) spectroscopy.
  • Numerical polarization analysis.
  • Atomistic molecular dynamics (MD) simulations.

Main Results:

  • Oligomer orientation at oil/aqueous interfaces is sensitive to aqueous salt concentration.
  • Salt addition induces changes in oligomer self-assembly and tail orientation.
  • Anionic effects, ion pairing, and altered solvation/H-bonding networks drive these changes.

Conclusions:

  • Quantitative insights into salt-modulated molecular orientations at buried interfaces.
  • Demonstrated the role of competitive ion effects in self-assembly.
  • Findings support the design of functional interfaces for chemical separations and biomimetic applications.