Binding of Ca²⁺ Ions to Alkylbenzene Sulfonates: Micelle Formation, Second Critical Concentration and Precipitation.

ABSTRACT: Anionic surfactants, such as sodium linear alkylbenzene sulfonates (NaLAS), are utilized in various fields, including industry, household, and agriculture. The efficiency of their use in aqueous environments is significantly affected by the presence of cations, Ca²⁺ and Mg²⁺ in particular, as they can decrease the concentration of the surfactant due to precipitation. To understand cation-sulfonate interactions better, we study both NaLAS colloidal solutions in the presence of CaCl₂ and precipitates forming at higher salt concentrations. Upon addition of CaCl₂, we find the surface tension and critical micelle concentration of NaLAS to decrease significantly, in line with earlier findings for alkylbenzylsulfonates in the presence of divalent cation

SUBMITTER: Adam AA 

PROVIDER: S-EPMC9864979 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature