Nanoseminar Azeza Morcy BSc.
Chair & host: dr. Riande Dekker
Speaker: Azeza Morcy BSc. (Physical and Colloid Chemistry)
Title: Stabilization mechanism of Pickering emulsions Network or Adsorption
Abstract: 锘縋ickering emulsions are made of two immiscible liquids kinetically stabilized by solid particles. Conventionally surfactants have been used as emulsifiers to stabilize emulsions, because of their amphiphilic character. The classical interpretation of how Pickering emulsions are stabilized is based on the adsorption of the particles at the oil/water interface. Through a steric mechanism, particles are able to hinder emulsion droplet flocculation by forming a densely packed layer covering the emulsion droplet surface. However, weakly flocculating solid particles in the continuous phase are also thought to stabilize a Pickering emulsion. By entrapping emulsion droplets within a network, they are able to slow down the kinetics of droplet coalescence. In spite of these two mechanisms being accepted as the main cause for stabilization in many studies, the role of solid particles acting as emulsifiers is still up for discussion. In this work, we explore ethyl cellulose nanoparticles (ECNPs) as emulsifiers in a water/soybean oil Pickering emulsion. In particular, we investigate the mechanism by which the ECNPs stabilize the emulsion.
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