194-200The surface properties and mixed micellization
behaviour of single gemini bis(hexadecyldimethylammonium) pentane dibromide
(G5) surfactant, three conventional surfactants (Cationic
cetyltrimethylammonium bromide (CTAB), anionic sodium dodecyl sulfate (SDS) and
nonioinic Polyethylene glycol dodecyl ether (Brij35)) and their equimolar
binary mixtures have been investigated by surface tension and spectrophotometry
methods at 300K. The critical micelle concentration (CMC), surface properties, max (maximum surface excess), Amin
(minimum surface area per molecule) and πCMC (surface pressure at the CMC) have
been determined. The deviation from the ideal of the mixed micelles has been
discussed on the basis of Clint theory. For mixed systems, regular solution
theory (Rubingh) and Rosen’s theories are used, which helps to evaluate the
composition of the mixed micelle, the activity coefficient, and interaction
parameters (β and β<span style="mso-char-type:symbol;mso-symbol-font-family:Symbol;mso-bidi-font-weight:
bold">σ). Negativity of interaction parameters
(β and βσ) for mixed micelle formation indicates
attractive interaction for all the system.
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