An aqueous ionic surfactant 1-dodecyl-4-dimethylaminopyridinium (DMP) bromide and the corresponding zwitterion 2- (4-dimethylaminopyridinio) -dodecanoate (DPN) were explored by means of molecular dynamics (MD) simulations and, for the ionic system, by infrared visible sum frequency generation (IR-VIS SFG). The molecular structure of the interfacial layer was investigated for the ionic and zwitterionic systems as a function of surfactant concentration, both in water and in salt (KF or KBr) solutions, by MD simulations in a slab geometry. The build up of the surface monolayer and a sublayer was monitored, and density and orientational profiles of the surfactants were evaluated. The difference between the ionic and zwitterionic systems and the effect of the added salt were analyzed at a molecular level . The results of MD simulations were compared to those of nonlinear optical spectroscopy
measurements. Infrared visible sum frequency generation (IR-VIS SFG) was employed to study the DMP ionic surfactant in water and upon addition of simple salts. The influence of added salts on the different molecular moieties at the interface was quantified in detail experimentally.
measurements. Infrared visible sum frequency generation (IR-VIS SFG) was employed to study the DMP ionic surfactant in water and upon addition of simple salts. The influence of added salts on the different molecular moieties at the interface was quantified in detail experimentally.
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