P. Goon et al., DETERMINATION OF CRITICAL MICELLE CONCENTRATION OF ANIONIC SURFACTANTS - COMPARISON OF INTERNAL AND EXTERNAL FLUORESCENT-PROBES, Journal of colloid and interface science, 189(1), 1997, pp. 177-180
Fluorescence spectroscopy has been utilized to determine the critical
micelle concentrations (CMC) of anionic surfactants by external and in
ternal probes and the results have been compared to those obtained by
the surface tension method. The selection of anionic surfactants gave
us the flexibility of having the probe within the surfactant molecule
and having it reside at the palisade layer or in the micellar core. It
is shown that the CMC value is not affected by the nature (whether pa
rt of the surfactant molecule or externally added) and location of the
probe within the micelle. CMC values determined by surface tension an
d fluorescence techniques using external and internal probes agree qui
te well in linear alkylbenzene sulfonate (LAS) and secondary alkyl sul
fonate (SAS) systems. (C) 1997 Academic Press.