The adsorption behaviour of long-chain N-alkyl betaines and their hydrobromides

Adsorption Isotherms for Concentrated Aqueous-Organic Solutions (CAOS)

“…The constants for these equations were derived from the best fit of data to Eqs. [3] and [7], and their values are listed in Tables 1 and 2, respectively. Figure 1a demonstrates that the Szyszkowski and the Connors equations, despite the fact that the underlying theoretical basis is questionable, may very well fit surface tension data.…”

“…x, [7] where σ s is the surface tension of the pure solute and α and β are empirical constants. For this equation the derivative of surface tension with respect to mole fraction is…”

The Interaction of Alkylglycosides with Other Surfactants

“…The similarity in the CMC values of the C 10 maltosides and glucosides is due to the fact that, for compounds with similarly charged hydrophilic groups, the values are almost exclusively due to the nature of their hydrophobic groups. Table 1 lists also the values of γ cmc , the CMC/C 20 ratio, and the pC 20 (the efficiency of surface adsorption, the negative log of the bulk surfactant concentration, C 20 , required to reduce the surface tension of the solvent by 20 mN m −1 ) (6b). The CMC/C 20 ratio is a measure of the tendency of the surfactant to adsorb at the air/solution interface relative to its tendency to form micelles (6c).…”

Comparing Decyl-β-maltoside and Octaethyleneglycol Mono n-Decyl Ether in Mixed Micelles with Dodecyl Benzenesulfonate

“…Furthermore, both static and dynamic surface tension have been measured on mixtures of alkyl polyglycosides (APG) and anionic surfactants (8) also here showing a net attraction between the surfactants. Surface tension of industrial grade APG and linear alkyl benzene sulfonate and fatty alcohol ethoxylates, respectively, have also been investigated with respect to their technical use (9). A comprehensive study of the mixed micelle interaction between different APGs and between an APG and ionic or nonionic (ethoxylated) surfactants have also been conducted (10).…”