Novel results on the adsorption of ionic surfactants at the air/water interface — sodium-n-alkyl sulphates

Modeling of Equilibrium Adsorption and Surface Tension of Cationic Gemini Surfactants

“…• , when corrected to include the effect of c W , near −30 kJ mol −1 for certain homologous series of monomeric ionic and nonionic surfactants (31,32). The standard analysis procedure for straight-chain surfactants is to further subdivide the value obtained for G…”

“…• values are often used to infer deviations from ideal adsorption behavior (28)(29)(30) and are known to correlate with the length of the alkyl surfactant tail (31)(32)(33). To compare K values, and similarly G…”

Synthesis and Properties of Piperazine Derivatives and Their Quaternary Ammonium Amphiphilic Salts

“…A similar trend has been reported for the water as the chain length increases. Similar behavior was long-chain quaternary ammonium salts of N,N-dimethylamobserved for the quaternary ammonium salts prepared from inoethyl methacrylate (26) and more recently for the sothe reaction of N,N-dimethylamino ethyl methacrylate with dium-n-alkyl sulfates anionic surfactant by Lunkenheimer et al (27). The decrease in slope of the surface tension versus log c plot means that the packing of the adsorbed molecules were less dense at the air-water interface as the alkyl chain length increases.…”

“…The decrease in slope of the surface tension versus log c plot means that the packing of the adsorbed molecules were less dense at the air-water interface as the alkyl chain length increases. Lunkenheimer et al (27) has attributed this effect to the increasing electrostatic repulsion within the adsorption layer.…”

Phase Transition in an Adsorption Layer of a Soluble Surfactant at the Air–Water Interface

“…His studies provide experimental evidence that the above-mentioned features are only caused by highly surfaceactive impurities, with dodecanol as the major trace impurity in the case of SDS and octanoic acid in the case of sodium octanoate. In both cases all signs of apparent phase transition vanish completely once the solution is properly purified (27,28). In a second study Henon and Meunier demonstrate the existence of coexisting domains of the slightly soluble compound hexadecanoic acid and tetradecanoic acid (29).…”