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Updated: Jun 14, 2025

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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The High Interfacial Activity of Betaine Surfactants Triggered by Nonionic Surfactant: The Vacancy Size Matching

Guoqiao Li1,2, Jinyi Zhao2, Lu Han3

  • 1College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China.

Molecules (Basel, Switzerland)
|June 13, 2025
PubMed
Summary

Alkyl sulfobetaines (ASB) and xylene-substituted alkyl sulfobetaines (XSB) achieve ultra-low interfacial tensions with oil-soluble Span80 by optimizing surfactant size matching. This finding is crucial for enhanced oil recovery applications.

Keywords:
betaineinterfacial tensionmixed adsorptionnonionic surfactantoil solubilitywater solubility

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Enhanced Oil Recovery using a Combination of Biosurfactants
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Area of Science:

  • Surfactant chemistry
  • Colloid and surface science
  • Enhanced Oil Recovery (EOR)

Background:

  • Alkyl sulfobetaines exhibit unique properties due to hydrophilic and hydrophobic group size mismatches.
  • Understanding interfacial behavior is key for optimizing surfactant performance in complex systems.

Purpose of the Study:

  • To investigate the interfacial tension (IFT) mechanisms between betaine surfactants (ASB, XSB) and nonionic surfactants (Span80, Tween80).
  • To explore the role of surfactant structure and adsorption in reducing IFT for potential enhanced oil recovery (EOR) applications.

Main Methods:

  • Utilized a spinning drop tensiometer to measure interfacial tensions.
  • Studied the interactions between alkyl sulfobetaines (ASB, XSB) and nonionic surfactants (Span80, Tween80) with n-alkanes.
  • Analyzed the adsorption behavior and interfacial film formation.

Main Results:

  • Span80 significantly reduced IFT with ASB and XSB by forming a compacted interfacial film, reaching ultra-low values of 5.7 × 10⁻³ mN/m.
  • Optimal IFT reduction was achieved by tuning the fit between nonionic surfactant size and betaine surfactant's oil-side vacancies.
  • Tween80 showed minimal impact on betaine surfactant IFT, indicating no significant aqueous-side vacancies.

Conclusions:

  • The size matching between nonionic and betaine surfactants is critical for ultra-low IFT generation.
  • Span80's effectiveness highlights its potential for use with betaine surfactants in EOR.
  • Findings provide valuable insights for selecting betaine surfactants and optimizing their application in oil recovery.