Adsorption isotherms of cationic surfactants on bitumen films studied using axisymmetric drop shape analysis

Bitumen-in-water emulsions are polydisperse bitumen droplets (from several tenths of a micrometer to several micrometers in diameter) dispersed in an aqueous phase that contains an ionic (usually cationic) surfactant. Bituminous emulsions are designed to "break" and release the bitumen when they are in contact with wetted gravel like flints, silicates and limestones.