Head-group-induced structural micellar transitions in mixed cationic surfactants with identical hydrophobic tails

Effects of interactions on the formation of mixed micelles of 1,2-diheptanoyl-sn-glycero-3-phosphocholine with sodium dodecyl sulfate and dodecyltrimethylammonium bromide

“…The total surfactant concentration was kept at 50 mmol L −1 . All chemical shifts were measured relative to the sodium 4,4-dimethyl-4-silapentane-1-sulfonate (DSS), which acted as an internal standard [18]. Deuterium oxide (D 2 O; 99.9%) from Aldrich was used as solvent instead of water to weaken the water signal for all solutions.…”

Mixed micelles of benzyldimethyltetradecylammonium chloride with tetradecyltrimethylammonium and tetradecyltriphenylphosphonium bromides: a head group contribution

“…These results emphasize the fact that head group modifications play a governing role in the aggregation of ionic surfactants. It has prompted us to evaluate the mixed aggregation process for the present systems, which is thought to be only influenced by factors such as bulkiness, charge screening, and steric hindrance of the unlike surfactant head groups in the mixed state [1,2]. It is also expected to be important from the fundamental understanding of the nature of different categories of cationic head groups and their influence on the mixed micelle formation.…”

“…In continuation of our efforts [1,2] to determine the head group modification effect on the mixed micellization of cationic surfactants, the present study deals with combinations of benzyldimethyltetradecylammonium chloride (BTDACl) with tetradecyltrimethylammonium (TTAB) and tetradecyltriphenylphosphonium (TTPB) bromides. In both the mixtures, i.e., BTDACl + TTAB and BTDACl + TTPB, the lengths of the hydrophobic tail have been kept deliberately equal so as to achieve a constant hydrophobicity in the mixed state.…”

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

“…In these studies, it is important to investigate the relationship between the critical micelle concentration (CMC) and the bulk mixing composition of the surfactant (x), as this relationship contains important information on the surfactants' interactions. Many researchers have used Clint's equation [12] or its modification (Rubingh's equation [13]) to explain CMC behavior in ionicionic and ionic-nonionic mixed surfactant solutions [14][15][16][17][18][19][20][21][22]. The interactions between surfactants in a mixed micelle have also been estimated using Rubingh's equation.…”