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We developed stable phase change material-in-water high internal phase Pickering emulsions (HIPPEs) using cellulose nanofibrils and DDAB. These HIPPEs offer a versatile platform for latent-heat storage and thermal management applications.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Stabilizing phase change materials (PCMs) within high internal phase emulsions (HIPEs) is difficult, limiting their use in functional materials.
  • Existing methods struggle with the inherent properties of PCMs, creating a need for novel stabilization strategies.

Purpose of the Study:

  • To introduce a novel strategy for creating stable PCM-in-water high internal phase Pickering emulsions (HIPPEs).
  • To explore the dual stabilization mechanism involving cellulose nanofibrils (CNF) and didodecyl dimethylammonium bromide (DDAB).

Main Methods:

  • Utilized oppositely charged CNF and DDAB to form PCM-in-water HIPPEs.
  • Investigated a dual stabilization mechanism involving interfacial complex adsorption and a continuous CNF network.

Main Results:

  • Achieved stable HIPPEs for over 30 days at room temperature.
  • Demonstrated suitability for diverse oils, including liquid paraffin, with up to 92% internal-phase volume.
  • HIPPEs showed promise as green templates and 3D printing inks.

Conclusions:

  • The CNF/DDAB complexation provides a robust dual barrier for HIPPE stabilization.
  • This method expands the fabrication possibilities for programmable HIPPEs in energy storage and thermal management.