6533b7d1fe1ef96bd125c0bb

RESEARCH PRODUCT

Acid—base properties of azo dyes in the presence of surfactants

M.c.garcía Alvarez-coqueG.ramis RamosJ.s.esteve Romero

subject

chemistry.chemical_classificationAggregation numberBase (chemistry)Potentiometric titrationInorganic chemistryProtonationCetylpyridinium chlorideBinding constantSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsBiomaterialschemistry.chemical_compoundColloid and Surface ChemistryAnilinechemistryPulmonary surfactant

description

Abstract The changes in the acid—base properties of an azo dye produced by the presence of surfactants, at surfactant concentrations below and above the CMC, are quantitatively described using a simple model and spectrophotometric and potentiometric measurements. The azo dye formed by aniline and N -(1-naphthyl)-ethylenediamine, and the surfactants sodium dodecyl sulphate, Triton X-100 and N -cetylpyridinium chloride (NCPC) are used. The protonation constants of the free and surfactant-bound dye species, the binding constant of the protonated and unprotonated forms of the dye, and the average aggregation number of the dye—NCPC aggregates are evaluated.

yearjournalcountryeditionlanguage
1991-01-01Journal of Colloid and Interface Science
https://doi.org/10.1016/0021-9797(91)90300-w