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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Cyclodextrins are known for their ability to form inclusion complexes.
  • Understanding the self-assembly behavior of cyclodextrins in solution and at interfaces is crucial for various applications.

Purpose of the Study:

  • To investigate the spontaneous aggregation of alpha-cyclodextrin (α-CD) in aqueous solution.
  • To study the adsorption and interfacial behavior of α-CD aggregates at the liquid/air interface.
  • To elucidate the complex interplay between bulk aggregation and interfacial phenomena.

Main Methods:

  • Transmission electron microscopy (TEM)
  • Dynamic light scattering (DLS)
  • Dynamic surface tensiometry
  • Brewster angle microscopy (BAM)
  • Neutron reflectometry
  • Ellipsometry

Main Results:

  • α-CD molecules spontaneously form aggregates in bulk solution that increase in size over time.
  • Aggregate size in the bulk dictates the adsorption rate at the liquid/air interface.
  • Interfacial α-CD aggregates coalesce to form 2D domains (micrometer scale) with nanometer-scale thickness.
  • The interfacial layer is kinetically trapped, not in fast dynamic equilibrium with the subphase.
  • Both bulk and interfacial ages significantly influence the observed processes.

Conclusions:

  • The self-assembly of α-CD in aqueous solution is a complex process involving spontaneous bulk aggregation.
  • Adsorption of these aggregates at the liquid/air interface leads to the formation of stable, kinetically trapped interfacial layers.
  • The study reveals unexpected complexity in the parallel bulk and interfacial phenomena of α-CD systems.