Hexadecyltrimethylammonium hydroxide solution is widely used as a phase transfer catalyst in organic synthesis, facilitating the transfer of reactants between immiscible phases. It is employed in the preparation of nanoparticles and as a surfactant in the synthesis of mesoporous materials, enhancing the uniformity and stability of the structures. In the textile industry, it serves as a softener and antistatic agent, improving the handling and feel of fabrics. Additionally, it is utilized in the formulation of hair conditioners and skincare products, where it acts as an emulsifier and conditioning agent, providing smoothness and moisture retention. Its antimicrobial properties also make it suitable for use in disinfectants and sanitizers, effectively controlling microbial growth.