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Mixing ionic and non-ionic surfactants like SLES, LAS, and EO7 creates tailored micellar structures. This enhances detergent performance by forming larger, more stable aggregates and optimizing solvation dynamics.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Surfactants are key components in detergents, influencing cleaning, aesthetics, and stability.
  • Combining ionic and non-ionic surfactants optimizes micellar structures, reducing CMC and improving formulation behavior.

Purpose of the Study:

  • Investigate micellar morphology and microstructure in single and mixed surfactant systems.
  • Utilize all-atom molecular dynamics simulations for detailed analysis.
  • Understand the impact of non-ionic surfactants on ionic surfactant aggregation and solvation.

Main Methods:

  • All-atom molecular dynamics simulations.
  • Analysis of micellar morphology transitions (spherical, ellipsoidal, cylindrical).
  • Quantification of aggregation number and solvent-accessible surface area.

Main Results:

  • Concentration-dependent transitions in micellar morphology observed.
  • Non-ionic surfactants (EO7) reduce electrostatic repulsion, increasing aggregation number by ~30% and decreasing surface area by up to 27%.
  • EO7 shows adaptive conformations, optimizing solvation and steric interactions; modulates hydrogen bonding in solvation shells.

Conclusions:

  • Mixed surfactant systems exhibit complex self-assembly and aggregation behavior.
  • Solvation dynamics are critical, with EO7 influencing headgroup-water and water-water hydrogen bonding.
  • Findings support rational design of advanced detergent formulations.