Abstract
Adsorption from aqueous solutions of mixtures of surfactants of cetyl trimethyl ammonium bromide (CTAB) and nonyl phenyl ethoxylates (NP −n) (n= 13, 20, 30) on PTFE was studied in a wide concentration range. The adsorption of CTAB was enhanced by the presence of nonionic surfactants and vice versa in the pre-CMC region due to chain–chain interactions. The decrease in adsorption level of CTAB with an increase in mole fraction of nonionic surfactants in the region above the CMC has been attributed to the decrease in monomer concentration due to mixed micellization with nonionic surfactants. In the case of adsorption of nonionic surfactants from the mixtures, adsorption increases in the presence of CTAB. It was also observed that among the various binary systems, maximum adsorption was observed with CTAB and NP-13 system. This was attributed to the formation of the most compact arrangement of surfactants in the clusters formed at the solid/liquid interface. Zeta potential studies carried out on these systems compliment the adsorption results.
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