Abstract
Interaction between cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS) has been known to form different types of assemblies. The mixed surfactant solutions may form clear, translucent, turbid, and precipitate comprising mixed micelles, mixed mono- and multi-lamellar vesicles and their insoluble products. These properties have been herein explored under three different concentrations of the surfactants (CTAB and SDS) (1) below, (2) near, and (3) above their critical micelle concentration (CMC) up to their equi-molar proportions and above. Their phase forming behaviors, and critical vesicle concentrations were determined from turbidimetry, conductometry and calorimetry measurements. Fluorescence anisotropy measurements were taken to confirm vesicle formation. Vesicle dimension was assessed from dynamic light scattering measurements. ζ- potential of the studied assemblies were found to be both positive and negative depending on their composition ratios. The formed vesicles at 1:1 M composition were very stable; they were extracted by isooctane by partition method from the dispersion state. Polar nonaqueous solvents were found to make the turbid vesicular solutions clear. Increased temperature favored transition of vesicles to mixed micelles. Field Emission Scanning Electron Microscopy and Confocal Fluorescence Microscopy evidenced formation of ion-pair products as well as both uni-, and multi-layer vesicles of moderate and large prolate type sizes. Antibacterial properties of the vesicles were also tested against E. coli and B. subtilis showing fair inhibition activities. The present multifarious detailed study contributes new and global inputs in the field of a model self-aggregated microheterogeneous amphiphilic vesicular systems with possible extension to future investigations with newer amphiphiles viz. bolaforms, pluronics, ionic liquids, geminis, etc.
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