Interaction Study of Anionic Surfactant with Aqueous Non‐Ionic Polymers from Conductivity, Density and Speed of Sound Measurements

Abstract

In the present study, we have investigated in detail the interactions of the anionic surfactant sodium dodecyl sulfate (SDS) with aqueous polyethylene glycol (PEG), polyvinyl pyrrolidone (PVP) and various PEG ? PVP mixtures at 293.15, 303.15 and 313.15 K by applying conductivity, density and speed of sound techniques. From experimentally measured data, the critical micelle concentration (CMC) values, standard free energy of micellization (DG m o ), standard enthalpy of micellization (DH m o ), standard entropy of micellization (DS m o ), isentropic compressibilities (j s ), apparent molar volumes (/ v ) and apparent molar isentropic compressions (/ k ) of SDS in aqueous polymer mixtures have been calculated. The nature of the process of micellization has been evidenced from the magnitude of DG m o , DH m o and DS m o values. The trends of variations obtained in the various parameters have been explained in terms of the electrostatic as well as hydrophobic interactions pertaining in SDS-PEG/PVP-water systems.

Polyvinylpyrrolidone-sodium dodecylsulfate complex is a family of pseudo-polyanions with different charge densities: Evidence from capillary electrophoresis, capillary viscosimetry and conductometry

“…It is found that c 1 is equal to 2.4 ± 0.1 mM independent of PVP mass concentration (q PVP ), whereas c 2 rises with the increase of q PVP . This result is in agreement with our previous discovery obtained from tensiometry [35] listed in the right column of Table 1 as control, and also consistent with other reports [36,37]. Fang et al [38] suggested using ''the specific saturation capacity of clusterization [U 1 ]" to describe the maximum amount of the micelle-like surfactant molecules aggregating on polymer chains.…”

Effects of Polymer Concentration and Temperature on Micellization of Cetyltrimethylammnium Bromide (Ctab) in Aqueous PVP-Ctab Mixed System

“…That is, micelles form in the solution spontaneously, which shows that interactions are voluntary. The sign of ∆H informs us on the nature of ΔS_2% micellization mechanism, in other words on whether it is endothermic or exothermic [46]. Positive ∆H value may emphasize importance of hydrophobic interaction while negative ∆H value shows that the major attraction force for micellization exhibits London dispersion interaction [47].…”

Aggregation and Adsorption Behavior of Cationic Surfactants (Cetyltrimethylammonium Bromide and Dodecyltrimethylammonium Bromide) in Aqueous Solutions of Antibiotic Drug (Amikacin Sulphate) at Different Temperatures

“…entropy. At lower temperatures the positive values can be recommended due to release of prearranged solvent molecules from the hydrophobic (non‐polar) part of the surfactant and that is the foremost attractive force for micelle formation via aquaphobic interactions (Chauhan et al, 2015).…”