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Enhancing surface/interface activity and wettability via trimeric surfactant-containing mixtures.

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This study reveals synergistic effects when mixing a trimeric surfactant with anionic-nonionic surfactants. This combination enhances surface activity and forms smaller vesicles, improving oil-water interface performance.

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Area of Science:

  • Colloid and Surface Science
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Surfactant aggregation behavior is crucial for applications like detergency, emulsification, and drug delivery.
  • Understanding mixed surfactant systems, especially those involving synergistic interactions, is key to optimizing performance.
  • Trimeric surfactants and their combinations with other surfactant types offer unique properties due to their complex structures.

Purpose of the Study:

  • To investigate the aggregation behavior and synergistic effects of a trimeric surfactant (Citric-3C12) mixed with anionic-nonionic surfactants (9-EOS/12-EOS).
  • To evaluate the impact of varying molar fractions on the mixed surfactant system's properties.
  • To characterize the interfacial and micellar composition and adsorption behaviors.

Main Methods:

  • Surface tension measurements
  • Dynamic Light Scattering (DLS)
  • Zeta potential analysis
  • Cryo-Transmission Electron Microscopy (Cryo-TEM)
  • Ideal mixing and regular solution models

Main Results:

  • Negative interaction parameters (βσ and βm) indicate strong synergistic interactions.
  • Mixed systems show significantly lower surface tension and critical micelle concentration (CMC) compared to individual surfactants.
  • Surfactants form vesicles above CMC, with size decreasing upon charge neutralization.
  • Enhanced oil-water interfacial activity and superior wettability on hydrophobic surfaces were observed.

Conclusions:

  • The combination of trimeric cationic and anionic-nonionic surfactants exhibits significant synergy driven by electrostatic, hydrophobic, and hydrogen bonding interactions.
  • The mixed surfactant systems demonstrate superior interfacial adsorption and wetting properties.
  • These findings suggest potential applications in areas requiring enhanced surface activity and controlled self-assembly.