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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Cyclodextrin-surfactant coassembly depends on the cyclodextrin ability to crystallize.

Jonas Carlstedt1, Azat Bilalov, Elena Krivtsova

  • 1Physical Chemistry, Center of Chemistry and Chemical Engineering, Lund University, POB 124, 221 00 Lund, Sweden. jonas.carlstedt@fkem1.lu.se

Langmuir : the ACS Journal of Surfaces and Colloids
|January 6, 2012
PubMed
Summary

This study maps phase diagrams for dodecyltrimethylammonium bromide (DTAB) with two cyclodextrins (CDs). DTAB and CDs form inclusion complexes, with differences in phase behavior and micelle association observed between β-cyclodextrin and 2HPβCD.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Surfactant-cyclodextrin mixtures are crucial in various applications.
  • Understanding their phase behavior is key to optimizing formulations.
  • Previous studies lacked complete phase diagrams for these ternary systems.

Purpose of the Study:

  • To construct full equilibrium phase diagrams for DTAB-water-β-CD and DTAB-water-2HPβCD systems.
  • To characterize the phases formed and their boundaries.
  • To investigate the influence of cyclodextrin type on phase behavior.

Main Methods:

  • Nuclear Magnetic Resonance ((2)H and (1)H diffusion NMR)
  • Small-Angle X-ray Scattering (SAXS)
  • Wide-Angle X-ray Scattering (WAXS)
  • Visual examination

Main Results:

  • Both systems exhibit an isotropic liquid solution (L(1)) phase.
  • The DTAB:2HPβCD:water system shows a normal hexagonal (H(1)) phase, absent in the β-CD system.
  • Cocrystallization of DTAB and β-CD was observed at high concentrations.
  • 2HPβCD associates with DTAB micelles, unlike β-CD.

Conclusions:

  • DTAB and cyclodextrins form high-affinity 1:1 inclusion complexes.
  • The type of cyclodextrin significantly impacts the phase diagram and micellar interactions.
  • This work presents the first complete phase diagrams for surfactant-CD mixtures, revealing novel cocrystallization phenomena.