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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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pH-Induced Re-entrant Microstructural Transitions in Cationic Surfactant-Hydrotrope Mixtures.

Chinedu D Umeasiegbu1, Vemuri Balakotaiah1, Ramanan Krishnamoorti1

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|December 15, 2015
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Summary

The pH-driven structural changes in cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal) mixtures were studied. Researchers observed transitions from rigid cylindrical micelles to spherical, then flexible cylindrical micelles, sensitive to temperature.

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Area of Science:

  • Physical Chemistry
  • Colloid Science
  • Materials Science

Background:

  • Cationic surfactant-hydrotrope mixtures exhibit complex phase behavior.
  • Understanding structural transitions is crucial for applications in formulation and materials science.

Purpose of the Study:

  • To investigate the pH-dependent structural transitions of aqueous CTAB-NaSal mixtures.
  • To elucidate the role of temperature on these microstructural changes.

Main Methods:

  • Dynamic Light Scattering (DLS) for micelle size and shape analysis.
  • Small-Angle Neutron Scattering (SANS) for detailed structural characterization.
  • Systematic variation of pH and temperature.

Main Results:

  • Observed a pH-induced transition from rigid cylindrical micelles (neutral pH) to spherical micelles (∼pH 2).
  • An unexpected reversion to flexible cylindrical micelles occurred at lower pH values.
  • These microstructural transitions were found to be highly temperature-sensitive.

Conclusions:

  • The study reveals complex pH- and temperature-dependent structural transitions in CTAB-NaSal mixtures.
  • Beyond electrostatic and hydrophobic interactions, cation-π and hydrogen bonding interactions likely govern these pH-induced changes.
  • Findings contribute to the fundamental understanding of surfactant-hydrotrope systems.