Thermodynamic properties of surfactant sodium n-heptyl sulfonate in water and in aqueous solutions of poly(ethylene glycol) at different temperatures

A comparison study between sodium dodecyl sulfate and sodium dodecyl sulfonate with respect to the thermodynamic properties, micellization, and interaction with poly(ethylene glycol) in aqueous solutions

“…The values of j s1 , j sm , and CM(A)C, which have been determined by fitting the concentration dependencies of j s using equation (6), are given in table 3. Because of the deviation from linearity at the highest concentration of ternary solutions, the model parameters have been obtained from the straight line parts of an experimental curve.…”

“…In continuation of our previous works on the thermodynamic properties of aqueous polymer-surfactant solutions [6,7], and in order to study the effect of PEG and temperature on the apparent molar volume and isentropic compressibility as well as the conductivity behavior of the monomer and micellar state of C 12 H 25 SO 4 Na and C 12 H 25 SO 3 Na, and therefore make a thorough analysis of the differences between C 12 H 25 SO 4 Na and C 12 H 25 SO 3 Na with respect to the their thermodynamic properties, micellization, and interaction with PEG in aqueous solutions, the apparent molar volume and isentropic compressibility of C 12 H 25 SO 4 Na and C 12 H 25 SO 3 Na in water and in aqueous solutions of PEG were determined at different temperatures from the accurate measurements of density and ultrasonic velocity. Furthermore, the electrical conductivity of these solutions was determined at different temperatures below and above the micellar composition range.…”

Thermodynamic investigation of the systems poly(ethylene glycol) + sodium pentane-1-sulfonate + water and poly(vinyl pyrrolidone) + sodium pentane-1-sulfonate + water

“…The values of coefficients of Eq. (19) for the solutions investigated in this work have been summarized in Table VIII of the supporting information. The positive B-coefficients suggest kosmotropes (structure-making), while negative B-coefficients indicate chaotropes (structure-breaking) for weakly hydrated solutes.…”

“…Despite the great interest in sodium alkane-1-sulfonates, few physicochemical studies of the monomers and the micelles can be found in the literature [7,[8][9][10][11][12][13][14][15][16][17][18][19]. Also, among all the mixed polymer-surfactant systems, only a few investigations involved sodium alkane-1-sulfonates [15,[19][20][21][22][23][24].…”

“…Also, among all the mixed polymer-surfactant systems, only a few investigations involved sodium alkane-1-sulfonates [15,[19][20][21][22][23][24]. This work is, thus, mainly focused on (i) the study of the thermodynamic properties of monomer and micellar state of sodium pentane-1-sulfonate (C 5 SO 3 Na) in water, with especial emphasis on the solute-solute and solute-solvent interactions and (ii) the physicochemical characterization of the C 5 SO 3 Na monomers and micelles in aqueous solutions of PEG or PVP.…”