Fluorescence Anisotropy of Probes Solubilized in Micelles of Tetradecyltrymethylammonium Bromide: Effect of Ethylene Glycol Added

Self-assembly of tetradecyltrimethylammonium bromide in glycerol aqueous mixtures: A thermodynamic and structural study

“…For comparison, we have also plotted the anisotropy values of both probes in glycerol-water homogeneous media of the same composition. From data in these media, it is evident that these probes are sensible to the viscosity of the medium, as previously reported [11,41]. In addition, data in Fig.…”

“…On the contrary, fluorescein is an anionic probe which will be micellized, through electrostatic interactions, at the positively charged TTAB micellar surface. Consequently, changes in the fluorescence anisotropy of fluorescein solubilized in TTAB micellar solutions will reflect changes at the micellar surface [41]. In Fig.…”

Thermodynamics and Micellar Properties of Tetradecyltrimethylammonium Bromide in Formamide–Water Mixtures

“…[13] From Eq. [13], the aggregation number n is obtained from the fitting of the fluorescence intensity data at various quencher concentrations. We have carried out triplicate quenching experiments by using pyrene as a probe and CPyC as a quencher.…”

Phase behavior of the mixtures of poly(oxyethylene) (10) stearyl ether (Brij-76), 1-butanol, isooctane, and mixed polar solvents

“…This indicated that mixing of EG (or TEG) with water modified the curvature of the interface and produced the phase transformation at a lower value of cosurfactant, thereby increasing the solubilization capacity of the system. The minimum in the X b vs ψ profile can be explained as a competition between two opposing factors; it has been reported that mixing of EG with water increased the cmc of both ionic and nonionic surfactant solutions [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. On the other hand, since the EG-hydrocarbon interfacial tension is smaller than the water interfacial tension, the aggregation number in the mixed solvent decreased, which in turn would increase the surface area per surfactant molecule.…”

“…EG is an important member of this class of organic NPS, since it contains two hydroxyl groups that can undergo hydrogen bond formation, a prerequisite for the aggregation of surfactants in a solvent [22]. But only limited studies have been carried out on the formation and characterization of micelles using this NPS [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. It has been reported that both inter-and intramolecular hydrogen bonds are formed in EG, although they are not as strong as those formed in water.…”