Surface tension isotherms, adsorption dynamics and dilational visco-elasticity of sodium dodecyl sulphate solutions

Tensiometry and dilational rheology of mixed β-lactoglobulin/ionic surfactant adsorption layers at water/air and water/hexane interfaces

“…1a and 1c present the P-C S adsorption isotherms for pure SDS and DoTAB layers and for SDS/BLG and DoTAB/BLG mixed layers at W/A and W/H interfaces measured with the double capillary for a drop pending in air or in hexane, respectively. The presented data for the individual surfactants are in very good agreement with recent literature data [23][24][25] showing that the plateaus indicating CMC of the surfactant solutions appear for SDS at a concentration amount after the washing out stage. Note, the course of the P-C SDS curves differs in respect to the way the mixed layer (simultaneous or sequential) is formed.…”

“…The adsorption of the individual SDS and DoTAB surfactants used in this study is also affected by the type of the interface and this is discussed in details elsewhere [23][24][25][33][34][35]. Briefly, due to dispersion forces between the surfactant molecules and those of the organic phase, on one hand the surfactant exhibits greater affinity to the water/oil interface as compared to W/A surface, estimated by calculations of the adsorption constant b S [34] and the adsorption energy [33], but on the other hand the accumulation of organic molecules around the surfactant hydrophobic chains results in a higher molar area than for the case of adsorption at W/A surface [23,34].…”

Surfactant induced complex formation and their effects on the interfacial properties of seawater

“…5a, for SSW rr , the scenario is the typical expected for a soluble surfactant, whose adsorption is governed by diffusion [49,50], with the elasticity modulus vanishing at the low and at the large concentrations and passing through a maximum. The behaviour observed for CTAB in SW is instead quite different.…”

Equilibrium and dynamic surface properties of trisiloxane aqueous solutions. Part 2. Theory and comparison with experiment

“…However, above CAC the monomers at the subsurface have two origins: on one side the diffusion of monomers from bulk, and on the other side the diffusion of aggregates from bulk to the subsurface where they disintegrate because the monomer concentration is lower than the CAC. Assuming that the disintegration process of the bulk aggregates is comparatively fast, it is possible to describe the adsorption of monomers at the air/liquid interface as a single effective process which an effective diffusion coefficient D* of monomers given by [26,27]: Feinerman et al to describe the surface behavior of SDS solutions [28].…”