Abstract
The mixed micellization of aqueous binary mixtures of DTAB-rich and SDS-rich surfactants, comprising sodium dodecyl sulfate (SDS) and dodecyltrimethylammonium bromide (DTAB) is studied in aqueous solution by using the physicochemical properties (PCPs) at three different temperatures (T = 293.15, 298.15, and 303.15 K) andP=0.1 MPa. The DTAB concentration is varied from 0.0001 to 0.03 M/mol·L−1in the ∼0.01 M/mol·L−1SDS solution, while the concentration of SDS is varied from 0.001 to 0.015 M/mol·L−1in the ∼0.005 M/mol·L−1DTAB. The stable formulations have been obtained by employing the DTAB-rich and SDS-rich surfactants solutions in 3 : 1 ratio. Therefore, different phases and aggregated states formed in the ternary combinations of DTAB/SDS/H2O have been identified and described. The calculated PCPs have been utilized for determining the nature of the solute-solvent interaction (SLS0I). With increasing surfactants concentration, the polarisation of the solution also increases along with an increase in relative viscosity (ηr), viscous relaxation time (τ), and surface excess concentration (Γmax). However, the surface area of the molecule (Amin), hydrodynamic volume (Vh), and hydrodynamic radius (Rh) decrease along with an increase in surfactants concentration.
Highlights
IntroductionMixed surfactants are used in a personal cleaning product, laundry aids, shampoo, fabric softeners, and solubilizers for water-insoluble or sparingly soluble bioinspired molecules like polyphenolic compound, ionic liquid, and anticorrosive agents for steel and plastics and used as a catalyst for some industrially significant reactions, flotation collectors for mineral ores, and leveling agents for improving the dyeing processes [13,14,15,16,17]
Maiti et al [23] have been investigated on oppositely charged single-tailed surfactants that could associate through electrostatic, ion-dipole, and van der Waals force attraction under specific conditions. us, the various aggregated microstructures of catanionic surfactants have attracted the attention of researchers for their multifaceted potential application in the field of drug delivery and nanoparticle synthesis. e structure of the surfactants plays an essential role in their aggregation behavior. e critical packing parameters infer the type of possible assemblies in the solution
Due to the addition of dodecyltrimethylammonium bromide (DTAB) into the aqueous system, the hydrophobic portion could be disrupted by the hydrogen bonding (HB) of the solvent system
Summary
Mixed surfactants are used in a personal cleaning product, laundry aids, shampoo, fabric softeners, and solubilizers for water-insoluble or sparingly soluble bioinspired molecules like polyphenolic compound, ionic liquid, and anticorrosive agents for steel and plastics and used as a catalyst for some industrially significant reactions, flotation collectors for mineral ores, and leveling agents for improving the dyeing processes [13,14,15,16,17] Because it has an amphiphilic nature, the study of the interaction of mixed surfactants in an aqueous medium helps to decode functional and diverse information about the system and assist in harnessing their potential in technical applications [18,19,20]. E critical packing parameters infer the type of possible assemblies in the solution Due to these potentials, the mixed surfactants solution has remarkable properties such as lower surface tension with higher surface activities and critical aggregation concentrations (CACs) which are essential for detergency and pharmaceutical applications [24, 25].
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