Effect of Hofmeister anions on micellization and micellar growth of the surfactant cetylpyridinium chloride.

摘要: Controlling the morphological characteristics of micellar solutions is important for surfactant performance and achieving desired properties. In this work we study how monovalent anions lyotropic series affect micellization, transitions, growth cationic N-cetyl pyridinium chloride (CPyCl), with aim a tool to methodically tune these self-assembly characteristics. For first time, set ions Hofmeister were studied by combining indirect (surface tension, conductivity, optical absorption, viscosity, dynamic light scattering) direct-imaging cryogenic-transmission electron microscopy (cryo-TEM). Following recent literature on anionic surfactants, considered headgroup as chaotropic cation, interacting cosmotrope chaotrope (Cl(-), Br(-), NO(3)(-), ClO(3)(-)). We show that micelles' structure strongly influenced both nature concentration added their location in series, but number itself cannot explain all effects measured. Especially interesting was relatively small effect chlorate ion CMC, its large transition growth. further test influence hydrotrope second CMC growth, compare it data obtained inorganic salts.