Octadecy Trimethyl Ammonium Bromide丨CAS 1120-02-1

Octadecyltrimethylammonium bromide is a quaternary ammonium surfactant widely used in pharmaceuticals, cosmetics, and chemical research. In pharmaceuticals, it functions as an antimicrobial agent, solubilizer, and emulsifying component in topical formulations, ointments, and creams. In personal care and cosmetic products, it is applied as a conditioning agent, antistatic additive, and emulsifier for lotions, hair care, and skin formulations. In chemical and materials research, it serves as a phase-transfer catalyst, facilitating organic reactions between immiscible phases, and as a template or stabilizer in nanoparticle synthesis and self-assembled monolayers. Additionally, it is employed in water treatment, textile processing, and surface modification due to its cationic surfactant properties.

The benefits of octadecyltrimethylammonium bromide arise from its strong surface activity, cationic charge, and chemical stability. Its long hydrophobic alkyl chain combined with a positively charged quaternary ammonium head allows efficient interaction with both organic and aqueous phases, enhancing emulsification, solubilization, and microbial inhibition. The compound exhibits good thermal and chemical stability, making it compatible with various formulation conditions and reaction environments. Its solubility in organic solvents and water allows versatile use in laboratory and industrial applications. Additionally, its antimicrobial and antistatic properties provide added functionality in cosmetic, pharmaceutical, and material formulations.