The aqueous Triton X-100 – dodecyltrimethylammonium bromidemicellar mixed system. Experimental results and thermodynamic analysis

SERAFINI, PATRICIO; FERNÁNDEZ LEYES, MARCOS; SÁNCHEZ M., JHON F.; PEREYRA, ROMINA B.; SCHULZ, ERICA P.; DURAND, GUILLERMO A.; SCHULZ, PABLO C.; RITACCO, HERNÁN A.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

ELSEVIER SCIENCE BV

Año: 2018 vol. 559 p. 127 - 135

0927-7757

The micellization process of the aqueous mixed system triton X-100 (TX100) ? dodecyltrimethylammonium bromide (DTAB) has been studied with a battery of techniques: surface tension, static and dynamic light scattering and ion-selective electrodes. Results have been also analysed with two thermodynamic procedures: the Regular Solution Theory or Rubingh´s model and the recently developed Equation Oriented Mixed Micellization Model (EOMMM). For αDTAB ≤ 0.40 (αDTAB: total molar fraction of the system without considering the water), the micelles are predominantly TX100 with scarce solubilized DTA+ ions, with TX100 acting as a nearly ideal solvent. In the range 0.50 ≤ αDTAB ≤ 0.75, it seems that none of the components acts as a solvent. Above αDTAB ≈ 0.75 there are noticeable changes in the size and electrophoretic mobility of the micelles. These phenomena have been interpreted in the light of the thermodynamic results and literature on some TX100-ionic surfactant mixtures. The case under study is an almost ideal but very asymmetric mixed surfactants system, what is very interesting in view of the very different nature and structures of the components.