Surfactant-free emulsions

Recent aspects and advances on surfactant-free emulsions are reviewed: preparation methods (e.g., acoustic emulsification, removal of dissolved gas from water and oil mixtures, utilization of solid particles, near- and super-critical carbon dioxide), colloidal stabilization (e.g., the addition of hydrophobic polymers into oil droplets, utilization of megasonic irradiation), and characterization techniques (single-droplet detection technique) of surfactant-free emulsions.