Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 559, Issue -, Pages 127-135Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2018.09.027
Keywords
Triton X-100; Dodecyltrimethylammonium bromide; Mixed micelles; Dynamic light scattering; Static light scattering; Electrophoretic mobility; Equation Oriented Mixed Micelle Model (EOMMM)
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Funding
- Universidad Nacional del Sur [PGI-UNS 24/F067, 24/Q073]
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT) [PICT-2013(D)-2070, PICT-2016-0787]
- Concejo Nacional de Investigaciones Cientificas y Tecnicas de la Republica Argentina (CONICET) [PIP-GI-2014 Nro 11220130100668CO]
- Comision de Investigaciones Cientificas de la Provincia de Buenos Aires (CIC)
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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 alpha(DTAB) <= 0.40 (alpha(DTAB): 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 <= alpha(DTAB) <= 0.75, it seems that none of the components acts as a solvent. Above alpha(DTAB) approximate to 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.
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