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Area of Science:

  • Colloid and Surface Science
  • Materials Chemistry
  • Emulsion Science

Background:

  • Solid-stabilized high internal phase emulsions (HIPPEs) are known for their interfacial mechanical barrier properties.
  • Novel non-Pickering emulsions (HIPNPEs) are stabilized by electrostatic repulsion, with particles in the continuous phase, but are rarely reported.
  • Stimulus-responsive emulsions offer dynamic control over emulsion properties.

Purpose of the Study:

  • To prepare and characterize novel high internal phase non-Pickering emulsions (HIPNPEs).
  • To investigate the synergistic stabilization mechanism involving anionic surfactants with dynamic covalent bonds and nano-SiO2 particles.
  • To explore the stimulus-responsive behavior and potential applications of these HIPNPEs.

Main Methods:

  • Preparation of HIPNPEs using anionic surfactants with dynamic covalent bonds and negatively charged nano-SiO2 particles.
  • Investigation of emulsion stabilization mechanisms under varying pH conditions (acidic and alkaline).
  • Rheological testing to analyze the viscoelastic properties of the prepared emulsions.

Main Results:

  • Successfully prepared HIPNPEs stabilized by anionic surfactants and nano-SiO2 particles.
  • Demonstrated pH-triggered switching: acidity inactivates surfactants and promotes HIPPE formation, while alkalinity regenerates HIPNPEs.
  • Rheological analysis revealed gel-like fluid behavior for both HIPNPEs and HIPPEs, similar to Pickering emulsions.

Conclusions:

  • HIPNPEs can be synergistically stabilized by dynamic covalent surfactants and charged nanoparticles.
  • The developed system exhibits rapid, reversible stimulus-responsive behavior for emulsion type conversion.
  • This work presents a new avenue for designing advanced stimulus-responsive high internal phase emulsions.