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    Controlling the microstructure of emulsions by exploiting particle-polyelectrolyte association

    Year: 2021

    Journal: J. Colloid Interface Sci., Volume 597, SEP, page 409–421

    Authors: Shahid, Shumaila; Basavaraj, Madivala G.

    Organizations: Department of Science and Technology (DST), Government of India [SB/S3/CE/053/2015]; DST [EMR/2016/002630]

    Keywords: Opposite charge; Polyethyleneimine; Particle coverage; Emulsion stability; Drop Microstructure; Particle-polyelectrolyte complexes

    Hypothesis: Albeit solid stabilized emulsions are studied for several decades, the surface of the emulsion drops most often are coated with densely packed and jammed monolayer of particles. However, a control over the area that the particles occupy on the drop surface is necessary, especially in applications involving controlled release of active compounds from emulsions. We hypothesize that it is possible to achieve precise control over the concentration of particles on the surface of emulsions by tailoring the adsorption of different species in a multi-component dispersion used for emulsification. Experiments: To this end, we carry out emulsification of oil and aqueous dispersions consisting of a combination of oppositely charged colloidal particles and polyelectrolyte. The droplet size distribution and storage stability of the oil-in-water emulsions, the microstructure, the percentage area of the drop surface occupied by the particles and the adsorption behavior of particle-polyelectrolyte binary dispersions are investigated. Findings: Our results demonstrate that the association between oppositely charged colloidal particles and polyelectrolyte can be exploited to obtain surface active species that aid in the formation of emulsions. Moreover, we found that the concentration of particle-polyelectrolyte complexes and polyelectrolyte in the dispersions used in emulsification greatly influence the mean diameter of the emulsions and their microstructure. Our findings provide a strategy to achieve control over surface coverage of particles on the emulsion droplets across a wide range - from a theoretically possible maximum, X90%, to as low as Interestingly, the emulsions formulated are found to possess excellent storage stability irrespec-tive of the particle coverage on the drop surface. (c) 2021 Elsevier Inc. All rights reserved.
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