Effect of Double Bonds in the Formation of Sodium Dodecanoate and Sodium 10-Undecenoate Mixed Micelles in Water

Abstract

The micellization of an aqueous mixture of sodium dodecanoate (SDD) and sodium 10-undecenoate (SUD) was studied with the theory of mixed micellization. A strong nonideality was found, with a preferential composition of mixed micelles. This phenomenon was interpreted on the basis of the interaction between the vinyl group and water by hydrogen bonding. The importance of the aliphatic pi electrons and water was stated.

Equation-Oriented Mixed Micellization Modeling of a Subregular Ternary Surfactant System with Potential Medical Applications

“…However, when SUD clearly predominates (α SUD > 0.8), α is augmented because the inclusion of many double bonds in the Stern layer decreases the surface potential, thus releasing Na + ions to the micelle Gouy–Chapman layer. The effect is similar to that produced by the inclusion of a nonionic surfactant in the mixed micelle . The catanionic systems SUD–DTAB and SDD–DTAB show high α values.…”

“…Tables SI, SII, and SIII in theSI report the experimental and ideal CMCs. The critical micelle concentrations of the pure components are CMC SUD = 0.120 mol•dm −3 , 18 CMC SDD = 0.021 mol•dm −3 , 19 and CMC DTAB = 0.015 mol•dm −3 . 18 In order to apply the original MRST, the binary interaction parameters have to be determined.…”

“…Tables SI, SII, and SIII in theSI report the experimental and ideal CMCs. The critical micelle concentrations of the pure components are CMC SUD = 0.120 mol·dm –3 , CMC SDD = 0.021 mol·dm –3 , and CMC DTAB = 0.015 mol·dm –3 …”

“…The Binary Systems. The nonideal bicomponent systems SUD−DTAB 18 and SUD−SDD 19 were previously studied, and we have now determined the CMC for the DTAB−SDD system. Tables SI, SII, and SIII in theSI report the experimental and ideal CMCs.…”

“…Since the biological activity of these substances is given by the monomeric (nonmicellized) species, it is important to determine the CMCs of these mixtures as well as other properties. Since the bicomponent systems DTAB−SUD 18 and SUD−SDD 19 are both nonideal, the DTAB− SUD−SDD mixture has been presumed to be highly nonideal.…”