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Area of Science:

  • Surface Science
  • Physical Chemistry
  • Environmental Science

Background:

  • Oil adhesion to ionic surfaces is common in nature.
  • Interfacial water plays a critical role in oil adhesion but is often overlooked.
  • Understanding this interaction is key for applications like oil recovery.

Purpose of the Study:

  • To investigate oil adhesion on carboxyl-terminated self-assembled monolayer (COOH-SAM) surfaces in ionic solutions.
  • To elucidate the role of interfacial water structure in oil adhesion.
  • To provide a molecular-level understanding of water-driven oil recovery.

Main Methods:

  • Utilized carboxyl-terminated self-assembled monolayer (COOH-SAM) surfaces.
  • Studied oil adhesion in ionic solutions.
  • Observed interfacial water structure using surface-enhanced Raman scattering (SERS).

Main Results:

  • Lower tetracoordinated water content correlated with stronger oil adhesion.
  • Multivalent ions disordered interfacial water more than monovalent ions, increasing oil adhesion.
  • Increased interfacial water thickness reduced oil adhesion.

Conclusions:

  • Interfacial water structure is a key determinant of oil adhesion.
  • Findings explain enhanced oil recovery in low salinity water flooding.
  • Potential applications in microfluidics and seawater desalination were indicated.