Synergistic Behavior Between Zwitterionic Surfactant α‐Decylbetaine and Anionic Surfactant Sodium Dodecyl Sulfate

Abstract

Here, we present experimental surface tension isotherms of mixed solutions of a zwitterionic surfactant a-decylbetaine (DB) and an anionic surfactant sodium dodecyl sulfate (SDS) in different molar ratios. These mixed solutions show a composition dependency with respect to both surface tension effectiveness and critical micelle concentration. The pseudo-regular solution theory has been used to evaluate the interaction parameters in the micelle, b m and at the surface, b s . The results revealed that the mixed solutions of DB/SDS behave synergistically in both surface tension reduction effectiveness and mixed micelle formation at all mole fractions investigated. The values of adsorption area per surfactant molecule at air/ solution interface were estimated, which provides some useful information on evaluating the interaction between DB and SDS in mixed adsorbed monolayers. The solubilization behaviors of toluene in DB/SDS mixed solutions were also investigated to help in understanding the structure of mixed micelles of DB and SDS.

Synergisms in Binary Mixtures of Anionic and pH‐Insensitive Zwitterionic Surfactants and Their Precipitation Behavior with Calcium Ions

“…Prior to the micellization, the adsorption of surfactant molecules, the so-called surface excess concentration (C t ) and the value of the mean molecular area (a m ) can be determined from the experimental data using the Gibbs adsorption isotherm equation [14]. Regular solution theory was used to predict the micelle compositions and fit the experimental data of the mixed micellization as explained in our previous work and in the literature [6,22,49,50].…”

“…It is commonly accepted that in today's detergent industry, zwitterionic surfactants have been much less produced and investigated in comparison to other classes of surfactants due to their higher production cost together with the fact that they account only for 5% of the total surfactant market [1][2][3]. Mostly, their behaviors are reported in association with ionic or nonionic surfactants [4][5][6][7]. Zwitterionic surfactants consist of two functional groups; one positively charged and one negatively charged, and are fascinating molecules because of their unique properties [8,9].…”

“…The strong synergistic interaction between anionic and zwitterionic surfactants could be due to the strong electrostatic attraction between these molecules [34]. Many previous studies have been devoted to pH-sensitive zwitterionic surfactants, for instance alkyl betaines, which are able to accept a proton in acidic solution to transform into a cationic form and thus react with anionic surfactants and other anions [1,6,[35][36][37][38]. However, studies on pH-insensitive zwitterionic surfactants have rarely been reported.…”

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

“…Such effect of the mixture is said to be synergistic. Synergism or antagonism properties are often exhibited due to mixtures of different types of surfactants [13][14][15][16][17]. The observed synergism can be referred to as nonideal mixing, whereas the antagonism property exhibits the repulsion between two surfactants and the CMC is higher than the expected.…”

Characterization of lauryl betaine foam in the Hele-Shaw cell at high foam qualities (80%–98%)

“…The electric attraction between the anionic surfactant and cationic center in betaine functional group enhances the packing density of the surface-active species at the air-water interface (Li et al 2012;Wang et al 2013;Cui 2014). The higher packing density of surface-active complex at the foam water-air interface enhanced the stability of the AOS-LB foam in the presence of oil (Wang and Zhang 2010).…”