The behavior of organic counterions in the micelle of alkylammonium decylsulfonates

Critical micelle concentrations and interaction parameters of aqueous binary surfactant:ionic surfactant mixtures

“…Alkylammonium dodecanesulfonates [C m H 2m+1 NH + 3 C 12 H 25 SO − 3 , CmADS; m = 1, 2, 3, 4, and 5] were obtained by double decomposition reactions between silver dodecanesulfonate and alkylammonium chlorides [31,32]. The silver dodecanesulfonate was obtained by a double decomposition reaction between silver nitrate and sodium dodecanesulfonate, which had been previously synthesized by refluxing a mixture of bromododecane (Tokyo Kasei) and sodium sulfite in water for 48 h under atmospheric pressure.…”

“…The surfactant mixtures which have different counterions give various E values, and it is important to consider the contribution of the counterion to the behavior of the surfactant mixture. The most appropriate surfactants to use for a consideration of the counterion's contribution are the alkylammonium dodecanesulfonates, as their properties are wellknown and the location of the alkylammonium ions in the micelle is clear [31,32,37,38]. The short alkyl chain counterions (ammonium, methylammonium, ethylammonium, and propylammonium) are hydrophilic and exist in the Stern layer of the micelle, while the long alkyl chain counterions (butylammonium and pentylammonium) are hydrophobic and insert themselves into the hydrophobic core of the micelle [31,32].…”

Unusual behavior of CMC for binary mixtures of alkyltrimethylammonium bromides: Dependence on chain length difference

“…Mukerjee [28] has pointed out an odd-even alternation of the standard free energies of micelle formation for alkylsulfates and, furthermore, the mobility of carbons is low in the neighborhood of the head group of the surfactant ion in a micelle [29]. These facts suggest that surfactants in micelles remain partially in a solid-like state.…”

Properties of the Quaternary Ammonium Salts with Novel Counterions

“…There are a lot of studies about the effect of counterions on the properties of anionic surfactants [8][9][10][11][12][13][14], indicating that the different types of counterions play an important role in the improvement of solution properties such as the surface activities and phase behavior. However, similar works for cationic surfactants are much less common.…”