An Interaction of Anionic-and Cationic-Rich Mixed Surfactants in Aqueous Medium through Physicochemical Properties at Three Different Temperatures (original) (raw)

e 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) and P � 0.1 MPa. e DTAB concentration is varied from 0.0001 to 0.03 M/mol·L −1 in the ∼0.01 M/mol·L −1 SDS solution, while the concentration of SDS is varied from 0.001 to 0.015 M/mol·L −1 in the ∼0.005 M/mol·L −1 DTAB. e stable formulations have been obtained by employing the DTAB-rich and SDS-rich surfactants solutions in 3 : 1 ratio. erefore, different phases and aggregated states formed in the ternary combinations of DTAB/SDS/H 2 O have been identified and described. e calculated PCPs have been utilized for determining the nature of the solute-solvent interaction (S L S 0 I). With increasing surfactants concentration, the polarisation of the solution also increases along with an increase in relative viscosity (η r), viscous relaxation time (τ), and surface excess concentration (Γ max). However, the surface area of the molecule (A min), hydrodynamic volume (V h), and hydrodynamic radius (R h) decrease along with an increase in surfactants concentration.

Physicochemical Properties of Dodecyltrimethylammonium Bromide (DTAB) and SodiumDodecyl Sulphate (SDS) Rich Surfactants in Aqueous Medium, At T = 293.15, 298.15, and 303.15 K

Macromolecular Symposia, 2018

The physicochemical properties of Dodecyltrimethylammonium Bromide (DTAB) and Sodium Dodecylsulfate (SDS) rich surfactants in aqueous medium have been studied by surface tension, viscosity, density, and sound velocity at T = 293.15, 298.15, and 303.15 K. The DTAB concentration varies from 0.0001 to 0.03 mol · L−1 in the presence of ≈0.01 mol · L−1 SDS and the SDS concentration varies from 0.001 to 0.015 mol · L−1 in the presence of ≈0.005 mol · L−1 DTAB, so that the concentrations of cationic (DTAB-rich) and anionic (SDS-rich) solutions are taken in the ratio of 3:1. The density (ρ) and sound velocity (μ) data are used for calculating apparent molar volume (Vϕ), friccohesity (σ), isentropic compressibility (Ks,ϕ), surface tension (γ), and viscosity (η). These parameters reveals that the relative solute-solvent and solute-solute interactions of SDS-DTAB and DTAB-SDS in an aqueous medium with the help of physicochemical properties (PCPs).

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Micellization and Interaction of Anionic and Nonionic Mixed Surfactant Systems In Water

Colloids and Surfaces A: Physicochemical …, 2005

Interaction between binary surfactant mixtures containing anionic surfactants viz. sodium dodecyl sulphates (NaDS) and magnesium dodecyl sulphates (Mg(DS)2) and a nonionic surfactants viz. dodecyl dodecapolyethylene glycol ether (C12E12) and dodecyl pentadecapolyethylene glycol ether (C12E15) in water at different mole fractions (0–1) were studied by surface tension, viscometry and dynamic light scattering (DLS) methods. The composition of mixed micelles and the interaction parameter, β evaluated from the CMC data obtained by surface tension for different systems using Rubingh’s theory were discussed. Activity coefficient (f1 and f2) of metal dodecyl sulphates (MDS)/C12Em (m= 12, 15) mixed surfactant systems were evaluated, which shows extent of ideality of individual surfactant in mixed system. The estimated interaction parameter indicates an overall attractive interaction in the mixed micelles, which is predominant for NaDS as compared to Mg(DS)2. Counter ion valency has specific effect on the mixed micelles, as Mg(DS)2 has less interaction with nonionic surfactants in comparison to NaDS due to strong condensation of counter ion. The stability factors for mixed micelles were also discussed by Maeda’s approach, which was justified on the basis of steric factor due to difference in head group of nonionic surfactant. DLS measurements and viscosity data reveals the synergism in mixed micelles, showing typical viscosity trends and linearity in sizes were observed.

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Micellization and Interaction Properties of Aqueous Solutions of Mixed Cationic and Nonionic Surfactants

Journal of Dispersion Science …, 2008

The micellization process of binary surfactant mixtures containing cationic surfactants viz.dodecyl pyridinium halide (C12PyX; X 5 Cl, Br, I), tetradecyl pyridium bromide (C14PyBr),and hexadecyl pyridium halide (C16PyX; X 5 Cl, Br) and a nonionic surfactants viz.dodecyl nonapolyethylene glycol ether (C12E9), dodecyl decapolyethylene glycol ether (C12E10), dodecyl dodecapolyethylene glycol ether (C12E12), and dodecyl pentadecapolyethylene glycol ether (C12E15) in water at different mole fractions (0–1) were studied by surface tension and viscosity methods. The composition of mixed micelles and the interaction parameter 'b' evaluated from the CMC data obtained by surface tension for different systems using Rubingh’s theory were discussed. Activity coefficient (f1 and f2) of cationic surfactant (CnPyBr)/C12Em (n 5 12, 14, 16 and m 5 10, 12, 15) mixed surfactant systems were evaluated, which shows extent of ideality of individual surfactant in mixed system. The stability factors for mixed micelles were also discussed by Maeda’s approach, which was justified on the basis of steric factor due to difference in head group of nonionic surfactant.

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