TITLE:
Experimental Study of Surface and Solution Properties of Gemini -conventional Surfactant Mixtures on Solubilization of Polycyclic Aromatic Hydrocarbon
AUTHORS:
M. Kamil, Huma Siddiqui
KEYWORDS:
Gemini Surfactants; PAHs; Solubilization; Mixed micelle; Solution Properties
JOURNAL NAME:
Modeling and Numerical Simulation of Material Science,
Vol.3 No.4B,
October
29,
2013
ABSTRACT: Experimental data are presented on the enhanced
solubilities of fluorene (FLR) resulting from solubilization in aqueous
solutions of two conventional surfactants: cationic cetyltrimethylammonium
bromide (CTAB) , anionic sodium dodecyl sulfate (SDS),
nonioinic polyethylene glycol dodecyl ether (Brij35) and a cationic gemini bis (hexadecyldimethylammonium)
pentane dibromide (G5). The critical micellar concentration of surfactants was
determined by surface tension measurements and aqueous solubilities of fluorene
compound in surfactant solutions were measured spectrophotometrically.
Solubilization of PAH compound commenced at the surfactant critical micelle
concentration and was proportional to the concentration of surfactant in
micelle. The results of the mixed systems were analyzed with the help of
regular solution theory, in which the deviation of CMCexp values for
mixed surfactant systems from CMCideal was measured by evaluating
the interaction parameter, βm. Negative values of βm were
observed in all equimolar binary systems which show synergism in the mixed
micelle. Attraction force between two oppositely charged head groups lead the
strongest synergism effect between cationic gemini and anionic conventional
surfactant. In addition to molar solubilization ratio (MSR) solubilization
efficiency is also quantified in terms of micelle-water partition coefficient
(Km).