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Interfacial Water-Dictated Oil Adhesion Based on Ion Modulation
Shaofan He1,2, Xu Jin3, Dianyu Wang4
1Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Journal of the American Chemical Society
|October 24, 2023
Summary
Interfacial water structure dictates oil adhesion on surfaces. Lower tetracoordinated water content and disordered water due to multivalent ions enhance oil adhesion, impacting oil recovery and desalination.
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.
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