Measurement of the Solubility of Benzene in Micellar Solution by NMR

Two-dimensional phase transition of styrene adsolubilized in cetyltrimethylammonium bromide admicelles on mica

“…The critical concentration that causes a phase transition of styrene inside the C 16 TAB admicelle observed here is much lower than its solubility in water [53] which is consistent with the solubilizaiton/adsolubilization capacities measured for aromatic hydrocarbons in C 16 TAB micelles [32,[54][55][56] and C 16 TAB admicelles [11,12]. The first critical phase transition concentration observed here occurs at a molar ratio (solubilized solute/adsorbed surfactant) between 0.72 and 2.7.…”

“…The second critical phase transition concentration is observed at a much higher molar ratio between 15 and 30. Since most of the aromatic-cationic surfactant systems have a solubilization capacity less than 3 [32,[54][55][56], the high molar ratio of 15-30 can only be explained by the solubilization of styrene by the phase-separated styrene droplets within the surfactant admicelle [12,57].…”

Shape Changes of C16TABr Micelles on Benzene Solubilization

“…(The solubility of benzene in water is 2 orders of magnitude lower than our benzene concentrations in the investigated micellar phase. 12 ) In samples containing perdeuterated benzene C 6 D 6 , the benzene content was established via 2 H NMR integral intensities; at high fields (g4.7 T) the two 2 H NMR signals from C 6 D 6 and C 16 TABr-R-d 2 are well separated. Note that the 2 H spin relaxation of C 6 D 6 was only measured at such high fields.…”

Micellar solubilization of tributylphosphate in aqueous solutions of Pluronic block copolymers

“…Especially, the phase behavior of the three components systems (Pluronic-TBP-water) have been described in detail. In this second part, 1 H NMR studies of TBP/micellar systems have essentially focused on elucidating the nature of the interactions between TBP and Pluronic micelle, or on the location of the solubilized species, mainly from the dependence of chemical shifts or linewidths on surfactant or solute concentration [38][39][40][41][42]57,58]. The location in the micelle where solubilization is occurring varies with the nature of the solubilizing molecule, especially with polar oils like TBP with intermediate properties.…”