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Summary

Didodecyldimethylammonium bromide (DDAB)/water aggregates in liquid crystal 5CB are stabilized by van der Waals forces between inverted micelles. These interactions prevent other mesophases and are enhanced by 5CB fluctuations near phase transitions.

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Soft matter physics

Background:

  • Didodecyldimethylammonium bromide (DDAB) is a surfactant used in various formulations.
  • Thermotropic liquid crystals like 5CB exhibit unique phase transitions.
  • Microemulsions involve the dispersion of immiscible liquids.

Purpose of the Study:

  • To investigate the structural properties and stability of DDAB/water aggregates in a 5CB liquid crystal solvent.
  • To understand the role of intermolecular interactions in stabilizing these microemulsions.
  • To elucidate the influence of the liquid crystal's phase behavior on the aggregate structure.

Main Methods:

  • Small-angle neutron scattering (SANS) experiments.
  • Small-angle X-ray scattering (SAXS) experiments.
  • Investigation above the nematic-to-isotropic phase transition temperature of 5CB.

Main Results:

  • The stability of the DDAB/water microemulsion is governed by attractive van der Waals interactions between spherical inverted micelles.
  • These strong attractive forces explain the absence of other swollen mesophases in related phase diagrams.
  • Increasing attractive interactions, driven by 5CB paranematic fluctuations, were observed upon approaching the isotropic-to-nematic phase transition.

Conclusions:

  • Van der Waals interactions are critical for the stability of DDAB/water aggregates in 5CB.
  • The observed interactions dictate the observed microemulsion structure and prevent the formation of other mesophases.
  • Liquid crystal fluctuations significantly influence the aggregate interactions near phase transitions.