Transport Properties of Aqueous Solutions of Alkyltrimethylammonium Bromide Surfactants at 25°C

Combining wide-angle and small-angle scattering to study colloids and self-assembly

“…3). The micelle characteristic aggregation number of around 44.5 molecules, counterion dissociation of~0.3 and diameter of roughly 34 Å corresponded well to that observed for C 10 TAB micelles characterized using other techniques [42][43][44]. The extent of counterion dissociation, in particular, matched the expected value of 0.36, calculated using the dressed micelle model [45].…”

Structure of cationic surfactant micelles from molecular simulations of self-assembly

“…Nevertheless, the bimodal distribution presented in are quite stable and far apart from each other. The mass-average micelle size for this system is 16, which is somewhat lower than experimental values for the same system (between 31 and 40 [32][33][34][35][36]) and simulations at a higher temperature [14], which implies that the present simulations at 298 K may not have reached full thermodynamic equilibrium (although the long duration of the plateau region, the high stability of individual micelles, and the bimodal shape of the micelle distribution suggest that they have at least reached a "pseudo-equilibrium" state). In fact, although the early stages of DeTAB self-assembly take place rather quickly, the later stages, when the system is close to equilibrium, proceed by very rare micelle fusion and breakage events, the frequency of which is significantly reduced at low temperature.…”

Microstructural characterization of lysophosphatidylcholine micellar aggregates: The structural basis for their use as biomembrane mimics

“…Since the CMC can be considered as the infinite dilution for micelles, the concentration dependence of D M P can be appropriately expanded as a function of (m À CMC) [16],…”

“…Indeed, spectroscopic techniques have been shown to be suitable for microscopic characterization of domains generated by surfactant aggregation as well as for investigation on intermolecular interactions. PGSTE-NMR provides accurate intradiffusion coefficients for the random thermal motion of surfactants in systems of uniform chemical composition, allowing to put in evidence the formation of micelles, and to estimate their dimension [15,16]. Moreover, the water mobility can be followed, furnishing information on the solute hydration [16,17].…”

“…PGSTE-NMR provides accurate intradiffusion coefficients for the random thermal motion of surfactants in systems of uniform chemical composition, allowing to put in evidence the formation of micelles, and to estimate their dimension [15,16]. Moreover, the water mobility can be followed, furnishing information on the solute hydration [16,17]. The EPR spectroscopy, via the introduction in the system of paramagnetic molecular probes [18], is particularly suitable for the characterization of intermolecular interactions in micellar systems, taking advantage by the direct relation existent between the spectra of spin probes and the micro-environment in which they are embedded [19,20].…”