1. Substances that work alongside primary surfactants to reduce surface tension and improve the stability and performance of emulsions, foams, or dispersions in formulations.
Usage: technical; chemistry; plural form; singular is cosurfactant

Examples

• The detergent formulation included cosurfactants to enhance the cleaning power of the primary surfactant.
• Cosurfactants are commonly used in cosmetic products to stabilize oil-in-water emulsions.
• The researchers added cosurfactants to the microemulsion to improve its thermodynamic stability.
• In pharmaceutical preparations, cosurfactants help solubilize poorly water-soluble drugs.
• The shampoo contained both anionic surfactants and cosurfactants for better foam stability.