investigation of dye- surfactan t ion pair formation in aqueous solutio n

The interaction between dyes and surfactants are su bjects of nu merous investigations [۱ ]. If a surfactant is added to a dye solution at submicellar conc entrations, the surfactant monomers and dye aggregates can interact. The form ation of ion associati on complexes between ionic surfac tants and d yes with opposite charge, at surfactant concentrations below the critical micelle c oncentration (CMC), is supported b y most published data.In this p aper, conduc tometric stu dies of the interactions between ani onic dye A cid Greeen ۲ ۵ (AG۲۵) and cetylpyridinium ch loride (CPC), is described. To und erstand the importance of different types of interactions for the formation of a dye- surfactant ion pair, a series of conductance measu rement was performed at five different tem peratures. A theoretical method was used to calculate the equilibrium constant a nd other ther modynamic functions for the form ation of the dye- surfactant ion pair.

کلیدواژه ها:

Conductometry ، Anionic dye ، Cationic surfactant ، Ther modynamics