title: Solid colloidal particles inducing coalescence in bitumen-in-water emulsions.
abstract: Silica particles are dispersed in the continuous phase of bitumen-in-water emulsions. The mixture remains dispersed in quiescent storage conditions. However, rapid destabilization occurs once a shear is applied. Observations under the microscope reveal that the bitumen droplets form a colloidal gel and coalesce upon application of a shear. We follow the kinetic evolution of the emulsions viscosity, eta, at constant shear rate: eta remains initially constant and exhibits a dramatic increase after a finite time, tau. We study the influence of various parameters on the evolution of tau: bitumen droplet size and volume fraction, silica diameter and concentration, shear rate, etc.
authors.affiliation: Laboratoire Colloïdes et Matériaux Divisés, ESPCI, 10 Rue Vauquelin, 75231 PARIS Cedex 05, France.
authors.forename: J
authors.initials: J
authors.lastname: Legrand
authors.forename: M
authors.initials: M
authors.lastname: Chamerois
authors.forename: F
authors.initials: F
authors.lastname: Placin
authors.forename: J E
authors.initials: JE
authors.lastname: Poirier
authors.forename: J
authors.initials: J
authors.lastname: Bibette
authors.forename: F
authors.initials: F
authors.lastname: Leal-Calderon