Competitive adsorption of lysozyme and non-ionic surfactants (Brij-35 and pluronic P123) from a mixed solution at water-air and water-xylene interfaces

Surfactant Adsorption to Different Fluid Interfaces

“…Our measurements confirm that adsorption depends upon the nature of the oil as well as the surfactant headgroup charge, size, and chemistry. Independent of the surfactant type, the oil polarity governs the adsorption isotherms and a general linear correlation between the initial interfacial tension and the interfacial pressure at the cmc is found and confirmed by literature data of over 30 publications. ,− ,,− Such linear correlation originates from the fully reversible adsorption and thermodynamic equilibrium as a result of the lack of interfacial chemical interactions, no structural rearrangements, and no dependency upon the contact angle. Surfactant adsorption to fluid interfaces is driven by the hydrophobic interactions with the oil phase and the free energy of adsorption, which depend upon the interfacial free energy.…”

“…In Figure , Π cmc is plotted over initial interfacial tensions for the o/w and a/w interfaces, showing the effect of oil polarity on the maximum interfacial pressure. Additionally, data from the literature is added to the graph. ,− ,,− The measured and literature data are listed in Tables S1–S4 of the Supporting Information and include only data measured at pH 7 with a salt concentration between 0 and 10 mM. Generally, salt affects the interfacial packing, interfacial tension, and cmc of the surfactant (especially ionic surfactants).…”

“…Interfacial pressure at the cmc of SDS, DTAB, and Brij 35 over the initial interfacial tension of different hydrophobic phases, including data from the literature. ,− ,,− …”

Salt induced micellization conduct in PEO–PPO–PEO-based block copolymers: a thermo-responsive approach

“…Consequently, the process of micellization occurs earlier and at a lower temperature when salt is present compared to its absence. 19,21,24 Additional salts, particularly powerful chaotropic compounds such as KI, NaSCN, KBr, and NaNO 3 can further decrease the CP of the BCPs. Dehydration of the PEO shell and increased hydrophobicity of the PPO blocks enhance the overall hydrophobicity of the copolymer chains, thereby promoting early micellization.…”

“…Notably, the second relaxation process exhibits an activation limit that significantly slow down as the molecular weight of the copolymer increases. Thus, the aggregation processes of these BCPs in aqueous solution is an intriguing research area and have been extensively investigated, considering the factors such as temperature and copolymer concentration, hydrophilic–lipophilic balance (HLB) range especially when understanding the behavior of micelles in the presence of various additives including ionic/nonionic surfactants, 6,14–22 salts, 5,23,24 denaturants, 12,25–27 alcohols, 17,28,29 ionic liquids, 30–32 and others 33–35 as it plays a crucial role in defining their applications).…”