Calorimetric observations of the sphere-rod transition of tetradecyltrimethylammonium bromide and sodium dodecyl sulfate: Effects of electrolytes and nonelectrolytes at 25 and 45°c

Role of added counterions in the micellar growth of bisquaternary ammonium halide surfactant (14-s-14): 1H NMR and viscometric studies

“…The changes in lw values were more pronounced with decreasing spacer (s = 4 > 5 > 6), reflecting the ability of geminis with short spacers to form micelles of very low curvature [38,39] (at fairly low concentrations), which is most likely due to the increasing geometrical constraints in the formation of aggregates with decreasing length of the spacer unit. As pointed out earlier, the reflection of micelle structural evolution can also be seen in viscosity variations.…”

Effect of Counterions on Properties of Micelles Formed by Alkylpyridinium Surfactants. 1. Conductometry and 1H-NMR Chemical Shifts

“…Various techniques have been widely used [27][28][29][30][31] in this field of research. We have applied 1 H-NMR to determine the position of aromatic counterions in alkylpyridinium micelles, using alkylpyridinium iodides as a reference.…”

Influence of the anion specificity on the electrochemical corrosion of anodized aluminum substrates

“…Indeed, at small separation distance, the interaction between charged bodies immersed in aqueous electrolyte solutions was found to be modulated according to the nature of the ion, even though the ion valence was the same; so contradicting the prevision of the cornerstone DLVO theory (Derjaguin, Landau, Verwey, Overbeek) where ions were considered only as point charges [2]. These ion specific effects play a significant role in numerous domains in which the interfacial behavior of ions is essential, such as (non exhaustive): stability and viscosity of particle dispersions [3,4], denaturation and aggregation of proteins [5], swelling of lipid bilayers [6], polymer conformation and adsorption to surfaces [7], sphere to rod transition of surfactant micelles [8], synthesis of mesoporous materials [9], surface tension of electrolyte solutions [10], inhibition of bubble coalescence [11], characteristics of seawater aerosols [12], behavior of formulations [13], efficiency of effluent purification processes [14].…”