title: Compositional ripening of particle- and surfactant-stabilised emulsions: a comparison.
abstract: When beta-ionone-in-water emulsions are mixed with squalane-in-water emulsions, the slightly water-soluble, mobile beta-ionone undergoes mass transfer to the drops of highly water-insoluble, immobile oil squalane. We have investigated this compositional ripening process for emulsions stabilised either by particles or by surfactant molecules. For particle-stabilised emulsions, the swelling of the squalane-containing drops triggers droplet coalescence which causes the final swollen droplet radius to be proportional to the swelling ratio to the power of 1. Surfactant-stabilised emulsions swell without coalescence which causes the final droplet radius to be proportional to the swelling ratio to the power 1/3. Addition of excess, non-adsorbed particles to the particle-stabilised emulsions suppresses the swelling-triggered coalescence and causes a switchover from particle to surfactant behaviour.
authors.affiliation: Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull, UK HU6 7RX.
authors.forename: Bernard P
authors.initials: BP
authors.lastname: Binks
authors.forename: Paul D I
authors.initials: PD
authors.lastname: Fletcher
authors.forename: Benjamin L
authors.initials: BL
authors.lastname: Holt
authors.forename: Olivia
authors.initials: O
authors.lastname: Kuc
authors.forename: Pascal
authors.initials: P
authors.lastname: Beaussoubre
authors.forename: Kenneth
authors.initials: K
authors.lastname: Wong