Adsorption Kinetics of C<sub>10</sub>E<sub>8</sub> at the Air−Water Interface

Chang, Hsin‐Yuan; Hsu, Ching-Tien; Lin, Shi‐Yow

doi:10.1021/la970923g

Cited by 100 publications

(123 citation statements)

References 21 publications

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“…1 and 2 for a broad range of n C (13,16,17). For some compounds, data from different authors are presented, which are in good mutual agreement.…”

Section: Resultsmentioning

confidence: 57%

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Adsorption Behavior of Oxyethylated Surfactants at the Air/Water Interface

Miller¹,

Fainerman²,

Möhwald³

2002

Journal of Colloid and Interface Science

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“…1 and 2 for a broad range of n C (13,16,17). For some compounds, data from different authors are presented, which are in good mutual agreement.…”

Section: Resultsmentioning

confidence: 57%

“…This tendency is observed also with an increasing number of oxyethylene groups in the C n EO m molecule. The experimental surface pressure isotherms of C n EO m for various m and fixed n (n = 10 and n = 12, respectively) obtained in (13,14,(16)(17)(18)(19)(20)(21) are shown in Figs. 3 and 4.…”

Section: Fig 2 the Same As Inmentioning

confidence: 99%

Adsorption Behavior of Oxyethylated Surfactants at the Air/Water Interface

Miller¹,

Fainerman²,

Möhwald³

2002

Journal of Colloid and Interface Science

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“…However, asymptotic solutions at long and at short times were obtained and have been successfully applied to surfactants (33). In particular, for ionic surfactants the equations in the form of derivatives are the following where D represents diffusion: [2] [ 3] If pure Fickian diffusion is the only mechanism for mass transport to the interface, one finds D short = D long = D, whereas activated diffusion may be taken into account by an effective diffusion coefficient D eff . Liggieri et al (34,35) introduced this idea, and their calculations showed that at long times small barriers have significant effects on Γ(t ).…”

Section: Resultsmentioning

confidence: 99%

Effect of additives on the adsorption of sodium bis(2‐ethyl hexyl sulfosuccinate) at the air‐water interface studied by equilibrium and dynamic surface tension measurements

Pedrosa

Briz

Velázquez

2002

J Surfact & Detergents

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Using equilibrium and dynamic surface tension measurements, we have studied the effect of the addition of poly(sodium 4-styrenesulfonate) (PSS), sodium chloride, and 1,4,7,10,13,16-hexaoxyacyclooctadecane (18-crown-6) on the surface properties of sodium bis(2-ethyl hexyl sulfosuccinate) (AOT). The addition of PSS or NaCl weakly increases the maximum packing of AOT, whereas the presence of 18-crown-6 slightly decreases the maximum surface coverage. The surfactant adsorption kinetics on the interface is a diffusion-controlled process. The two asymptotic solutions at long times and at short times to the classic Ward Tordai equation were used to fit dynamic results. At long times there is evidence of the existence of an electrostatic barrier at high surfactant concentration when using pure AOT and AOT mixed with PSS. In binary mixtures of AOT with sodium chloride or 18-crown-6, the electrostatic barrier is not observed over the surfactant concentration range studied.Paper no. S1292 in JSD 5, 397-402 (October 2002).KEY WORDS: Aerosol OT; 18-crown-6; dynamic surface tension; equilibrium surface tension; poly(sodium 4-styrensulfonate).Dynamic surface tension, γ(t), is an important property of surfactant solutions because several technological processes use surfactant solutions under nonequilibrium conditions. The dynamic surface tension also provides information on the kinetics of surfactant adsorption at the interface. It is well established that the transport of bulk soluble surfactant at the interface includes bulk diffusion and adsorption/desorption processes and that the controlling mechanism of this mass transfer can change as a function of bulk concentration (1-3), the kind of surfactant (1,4,5), and the counterion concentration (6,7). Industrially, surfactants are often mixed with polymers because mixtures provide more desirable properties than the pure surfactant (8-10). In foams and emulsions, polymers can affect the thermodynamic and dynamic properties of such mixtures. For instance, when soluble polymers are added to solutions they increase the bulk viscosity and can dramatically change the drainage of the thin liquid film. If the polymers are surface active, they can also influence the surface rheological properties and further decrease the rate of fluid flow out of the film (11,12). The correct use of these mixtures requires knowledge of their adsorption kinetics. Whereas the adsorption kinetics of pure surfactants has been extensively studied, there is not enough information about dynamic superficial properties of surfactant-polymer mixtures (13)(14)(15)(16)(17). This current work provides information on both equilibrium and dynamic properties of sodium bis(2-ethyl hexyl sulfosuccinate) (AOT) mixed with poly-(sodium 4-styrenesulfonate) (PSS) and mixed with the macrocyclic polyether 18-crown-6 (1,4,7,10,13,16-hexaoxyacyclooctadecane, C 12 H 24 O 6 ). It is well known that 18-crown-6 forms complexes (18) with several cations such as Na + ; therefore, the addition of this crown ether reduces the concentratio...

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“…On the other hand, Lin et al (30,31) in studies on polyoxyethylene alcohols in air/water systems concluded that the controlling mechanism for mass transfer can change from diffusion to mixed kinetic-diffusion control as a function of bulk concentration. By examining how D changes with concentration they suggested a diffusion-controlled mechanism at dilute bulk concentrations, where the equilibrium surface coverage is low, and a mixed kinetic-diffusion control as the bulk concentration becomes higher and the equilibrium surface coverage is increased.…”

Section: Dynamic Interfacial Tensionmentioning

confidence: 99%