Effect of Inorganic Additives on a Conventional Anionic–Nonionic Mixed Surfactants System in Aqueous Solution

Abstract

The interaction between an anionic surfactant (sodium dodecyl sulfate) and a nonionic surfactant [polyoxyethylene (9.5) octyl phenyl ether] in aqueous salt solution was investigated using the surface tension method. The critical micelle concentration values were determined for the individual surfactants and their corresponding mixtures. The interaction parameter between the surfactants in the mixed micelles, the activity and activity coefficients in the mixed micelles, and the thermodynamic parameters were calculated using various approaches, viz., Clint, Rubingh, and Maeda models. It was observed that the critical micelle concentration of the mixed surfactants system reveals little deviation from ideality.

Effect of sodium chloride on interaction between amino sulfonate amphoteric surfactant and octylphenol polyoxyethylene ether (10) in aqueous solution

“…For example, at 25 8C the cmc values for C 12 H 25 (OC 2 H 4 ) 7 OH in absence and present of NaCl (0.1 mol/L) are 8.2 Â 10 À5 mol/L and 7.9 Â 10 À5 mol/L, respectively; for n-C 10 H 21 -b-D-glucoside, 2.2 Â 10 À3 and 1.9 Â 10 À3 , respectively; for C 10 H 21 -b-D-maltoside, 2.0 Â 10 À3 and 1.95 Â 10 À3 , respectively. In Table 1, the cmc value of C12AS in aqueous solution in the presence of NaCl is also found to be lower than the case in the absence of NaCl [18], which is due to the shielding effect of the added counterion Na + on the ionic headgroup of C12AS [2,14,18]. And as shown in Table 1, it may be mainly the shielding effect that the experimental values of mixed cmc (C M ) at different molar composition in aqueous solution in the presence of NaCl are less than the values in the absence of NaCl [18].…”

“…The addition of inorganic salts is known to modify the properties of surfactant solutions, such as solubility, the interaction parameters of both solute-solute and solute-solvent, the micellar behavior for individual or mixed surfactant systems, and so on. For the ionic surfactants, the added inorganic salt, especially counterion, can compress the thickness of ionic atmosphere for the ionic headgroup of surfactant, consequently resulting in the reduction of electrostatic repulsion between their ionic headgroups, and favoring the formation of micelles [1,2,13,14]. While in nonionic surfactants solution, the addition of inorganic salt does not have drastic effects on the formation of micelle as compared to the ionic surfactants [1,2].…”

“…While in nonionic surfactants solution, the addition of inorganic salt does not have drastic effects on the formation of micelle as compared to the ionic surfactants [1,2]. For the mixed surfactant systems, the addition of inorganic salt may result in different micellar behavior [13][14][15]. At present, many investigations have reported the effect of inorganic salt on the micellar behaviors for the mixtures of ionic-nonionic surfactants [13][14][15].…”

“…For the mixed surfactant systems, the addition of inorganic salt may result in different micellar behavior [13][14][15]. At present, many investigations have reported the effect of inorganic salt on the micellar behaviors for the mixtures of ionic-nonionic surfactants [13][14][15]. However, the micellar behaviors of zwitterionic-nonionic surfactants in aqueous solution containing inorganic salt have rarely been investigated.…”

Surfactant (in situ)–Surfactant (Synthetic) Interaction in Na2CO3/Surfactant/Acidic Oil Systems for Enhanced Oil Recovery: Its Contribution to Dynamic Interfacial Tension Behavior

“…6). Surfactant-surfactant interactions in aqueous anionic-nonionic mixed micelles have been extensively investigated in terms of the interaction parameter b M [14][15][16][17][18]. A negative b M means that the repulsive interactions between the two different surfactants in mixed micelles are weaker than the repulsive interactions of the individual surfactants with themselves in single micelles.…”