The influence of divalent cations on the dynamic surface tension of sodium dodecylbenzenesulfonate solutions

Dudek, Marcin; Olsen, Arnt Ove Jektvik; Øye, Gisle

doi:10.1016/j.colsurfa.2023.132007

Cited by 2 publications

(2 citation statements)

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“…The surface excess concentration (Γ max ) and the minimum area per molecule (A min ) at the air/liquid interface are calculated using the Gibbs adsorption equation [ 16 ]:

where R is the gas constant (8.314 J·mol −1 ·K −1 ), T is the absolute temperature, N A is Avogadro’s constant, and

is the slope below the cmc; n = 2 for the pure OE 3 P 3 S and CTAB, and n = 1 for the binary systems. The Γ max and A min obtained are listed in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

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Adsorption and Aggregation Behaviors of Oleyl Alcohol-Based Extended Surfactant and Its Mixtures

Li,

Ren,

Wang

et al. 2024

Molecules

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An oleyl alcohol-based extended surfactant, sodium oleyl polyethylene oxide-polypropylene oxide sulfate (OE3P3S), was synthesized and identified using FT-IR and 1H NMR. The adsorption and aggregation behaviors of OE3P3S and its mixture with cationic surfactant alkyltrimethylammoniumbromide (ATAB) were investigated under different molar ratios. The static surface tension analysis indicated that the critical micellization concentration (cmc) and the critical surface tension (γcmc) of OE3P3S were 0.72 mmol/L, and 36.16 mN/m, respectively. The cmc and γcmc values of the binary system were much lower than that of the individual component. And the cmc values of OE3P3S/ATAB = 6:4 mixtures decreased with an increase in the chain length of the cationic surfactant in the binary system. It was found from the dynamic surface tension that there was a slower diffusion rate in the binary system compared to the pure surfactant, and the adsorption processes for OE3P3S/ATAB = 6:4 were mixed diffusion-kinetic adsorption mechanisms. With a combination of DLS data and TEM measurements, formations of vesicles in OE3P3S/ATAB = 6:4 solutions appeared to occur at a concentration of 0.05 mmol/L. By studying the formation of liquid crystal structures in an emulsion prepared with OE3P3S as the surfactant, it was found that the oil-in-water emulsion is birefringent with a Maltese cross texture, and the rheological properties revealed its predominant viscoelastic behavior and shear thinning properties.

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“…The surface excess concentration (Γ max ) and the minimum area per molecule (A min ) at the air/liquid interface are calculated using the Gibbs adsorption equation [ 16 ]:

where R is the gas constant (8.314 J·mol −1 ·K −1 ), T is the absolute temperature, N A is Avogadro’s constant, and

is the slope below the cmc; n = 2 for the pure OE 3 P 3 S and CTAB, and n = 1 for the binary systems. The Γ max and A min obtained are listed in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

“…The surface excess concentration (Γ max ) and the minimum area per molecule (A min ) at the air/liquid interface are calculated using the Gibbs adsorption equation [16]:…”

Section: Systemsmentioning

confidence: 99%