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Foam Stability Mediated by Cellulose Nanocrystal-Anionic Surfactant Interactions.

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Area of Science:

  • Materials Science
  • Colloid and Surface Science
  • Sustainable Chemistry

Background:

  • Anionic surfactants and cellulose nanocrystals (CNC) are key components in modulating aqueous system properties.
  • Understanding their interactions is crucial for developing sustainable formulations in personal care, food, and household products.

Purpose of the Study:

  • To investigate the interactions between CNC and anionic alkyl poly(ether) carboxylate surfactants.
  • To elucidate how these interactions affect interfacial and foaming properties in aqueous systems.

Main Methods:

  • Surface tension measurements
  • Interfacial rheology
  • Foaming tests
  • Particle size analysis
  • Zeta potential measurements
  • Electron microscopy

Main Results:

  • CNC slightly increased surfactant critical micelle concentration and reduced interfacial adsorption.
  • CNC improved dispersion and aggregate formation with increasing surfactant concentration.
  • Foamability was slightly reduced by CNC, but foam stability significantly increased at low surfactant concentrations due to CNC aggregation and network formation.
  • Interfacial viscoelasticity increased, indicating stronger interfacial layers, especially at low surfactant concentrations.

Conclusions:

  • CNC-surfactant interactions enable tunable control over interfacial structure and foam stability.
  • The aggregation state of CNC is critical in determining foam properties.
  • These findings provide valuable insights for designing greener formulations using CNC and surfactants.