  The micellization process of the aqueous mixed system Triton X-100
(TX100)-Dodecyltrimethylammonium Bromide (DTAB) was studied with a battery of
procedures: surface tension, static and dynamic light scattering and
ion-selective electrodes. Results were also analysed with two thermodynamic
procedures. The system shows some changes in its behaviour with changing the
mole fraction of DTAB, $\alpha_{DTAB}$, in the whole surfactant mixture. For $
\alpha_{DTAB} < 0.40$ micelles are predominantly TX100 with scarce solubilized
DTA+ ions, and TX100 acts 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,
and above $\alpha_{DTAB} > 0.75$ there are abrupt changes in the size and
electrophoretic mobility of micelles. These phenomena have been interpreted in
the light of the thermodynamic results and some TX100-ionic surfactant mixtures
of literature.
