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Chain conformation: A key parameter driving clustering or dispersion in polyelectrolyte - Colloid systems.

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Summary

Hyaluronic acid and salt concentration influence Pluronic F127 micellar solutions. Increasing ionic strength or hyaluronic acid concentration promotes micellar clustering and liquid crystalline phase formation.

Keywords:
Chain conformationDepletionHyaluronic acidIonic strengthPluronicSmall angle neutron scattering

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Area of Science:

  • Polymer science
  • Materials science
  • Physical chemistry

Background:

  • Pluronic F127 forms micelles in aqueous solutions.
  • Hyaluronic acid is a biopolymer with significant effects on solution properties.
  • Understanding their interactions is crucial for various applications.

Purpose of the Study:

  • Characterize Pluronic F127 micellar solutions with hyaluronic acid.
  • Investigate the impact of salt concentration and type on these systems.
  • Determine the phase behavior and aggregation mechanisms.

Main Methods:

  • Differential scanning calorimetry (DSC) for thermal analysis.
  • Small-angle neutron scattering (SANS) for structural characterization.
  • Systematic variation of salt concentration, type, and hyaluronic acid parameters.

Main Results:

  • Hyaluronic acid lowers the critical micellar temperature, similar to increased ionic strength.
  • Micelle size and shape remain unaffected by hyaluronic acid, but dispersion changes with salt.
  • Increased ionic strength induces micellar clustering and formation of a face-centered cubic liquid crystalline phase.
  • Divalent cations (e.g., Ca2+) strongly promote micellar aggregation and crystallization.
  • Hyaluronic acid concentration and molecular weight enhance these aggregation behaviors.

Conclusions:

  • Salt-induced changes in hyaluronic acid conformation (from stretched to coil) drive micellar aggregation via depletion interactions.
  • The observed phase transitions are tunable by adjusting salt and hyaluronic acid properties.
  • These findings offer insights into designing advanced functional materials based on polymer self-assembly.