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Cellular Affinity of Particle-Stabilized Emulsion to Boost Antigen Internalization

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Doubly pH-responsive pickering emulsion.

Jian Li¹, Harald D H Stöver

¹Department of Chemistry, McMaster University, Hamilton, ON, Canada L8S 4M1.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 1, 2008

Summary

This study introduces a novel pH-responsive Pickering emulsion using silica nanoparticles and potassium hydrogen phthalate. The system demonstrates reversible emulsification controlled by pH, offering tunable stability for xylene-in-water mixtures.

Area of Science:

Colloid and Surface Science
Materials Chemistry
Nanotechnology

Background:

Pickering emulsions are stabilized by solid particles, offering advantages over traditional surfactants.
Developing stimuli-responsive emulsifiers is crucial for advanced material applications.
Controlling emulsion stability with external triggers like pH is an active research area.

Purpose of the Study:

To design and characterize a novel pH-responsive Pickering emulsifier.
To investigate the reversible emulsion stabilization mechanism based on pH-dependent particle interactions.
To demonstrate the application of this system for stabilizing xylene-in-water emulsions.

Main Methods:

Utilized alumina-coated silica nanoparticles (Ludox CL) and potassium hydrogen phthalate (KHP).

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Investigated the adsorption behavior of KHP onto nanoparticle surfaces across a pH range.

Formulated and characterized Pickering emulsions of xylenes in water under varying pH conditions.

Assessed the reversibility and stability of the emulsions.

Main Results:

Potassium hydrogen phthalate (KHP) binds to cationic silica nanoparticle surfaces between pH 3.5 and 5.5.
This pH-dependent binding creates surface-active particles capable of stabilizing xylene-in-water emulsions.
The system exhibits reversible demulsification above and below the effective pH range.
Two distinct pH-controlled reversible transitions were observed.

Conclusions:

A novel, reversible pH-responsive Pickering emulsifier was successfully designed.
The emulsifier's activity is governed by the pH-dependent adsorption of KHP onto silica nanoparticles.
This system offers a tunable platform for emulsion stabilization with potential applications in controlled release and separation technologies.