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Pickering emulsion templated layer-by-layer assembly for making microcapsules.

Jian Li1, Harald D H Stöver

  • 1Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada L8S 4M1.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 4, 2010
PubMed
Summary

This study demonstrates that using LUDOX HS nanoparticles in layer-by-layer assembly creates robust microcapsules. These composite shells offer improved encapsulation efficiency for hydrophobic materials, unlike those made with LUDOX CL particles.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Nanotechnology

Background:

  • Pickering emulsions offer a versatile platform for creating microcapsules.
  • Layer-by-layer (LbL) assembly enables the construction of complex composite shells.
  • Surface modification of nanoparticles influences emulsion and capsule properties.

Purpose of the Study:

  • To investigate the impact of different nanoparticle templates on microcapsule shell properties.
  • To optimize the formation of stable microcapsules for effective encapsulation.
  • To evaluate the suitability of LbL-assembled microcapsules for hydrophobic material delivery.

Main Methods:

  • Fabrication of Pickering emulsions using poly(sodium styrenesulfonate) (PSS) surface-modified LUDOX CL particles.

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  • Layer-by-layer (LbL) deposition of polyelectrolytes (poly(diallyldimethylammonium chloride) - PDADMAC) and charged nanoparticles.
  • Comparative analysis of microcapsules formed with LUDOX CL and LUDOX HS nanoparticles.
  • Assessment of microcapsule wall porosity, structural integrity, and encapsulation efficiency.

    • Main Results:

    • LbL coating with PDADMAC and PSS on LUDOX CL templates resulted in porous microcapsule walls.
    • The porous structure led to significant microcapsule rupture and low encapsulation efficiency.
    • Microcapsules fabricated using PDADMAC and anionic LUDOX HS nanoparticles exhibited dense walls.
    • These LUDOX HS-based microcapsules demonstrated enhanced structural integrity and suitability for hydrophobic encapsulation.

    Conclusions:

    • The choice of nanoparticle template is critical for controlling the morphology and stability of LbL-assembled microcapsules.
    • Anionic LUDOX HS nanoparticles provide a superior template for creating robust microcapsule shells compared to LUDOX CL.
    • Dense-walled microcapsules formed with LUDOX HS are promising for the microencapsulation of diverse hydrophobic materials.