Adsorption Relaxation for Nonionic Surfactants under Mixed Barrier-Diffusion and Micellization-Diffusion Control

Danov, Krassimir D.; Valkovska, Dimitrina S.; Kralchevsky, Peter A.

doi:10.1006/jcis.2002.8358

Cited by 37 publications

(36 citation statements)

References 26 publications

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“…As time goes on, R J becomes smaller and the process can turn into diffusion controlled. This change of adsorption mechanism was studied theoretically in more details in [72]. The fact that the mechanism of surfactant transport can change with time means that it is possible to have systems or conditions (even for the same system) when the diffusion and the adsorption fluxes have comparable ''resistances''.…”

Section: Barrier-controlled Adsorptionmentioning

confidence: 98%

“…Then the rates of adsorption, r ads , and desorption, r des , are different and the surfactant flux is J ads =r ads Àr des . The boundary condition (4.3) for the perturbation of the adsorption is [72]: dC C dt þ C eqȧ a ¼ J ads ¼r r ads Àr r des ð4:8Þ…”

Section: Barrier-controlled Adsorptionmentioning

confidence: 99%

“…The adsorption rate is r ads =k ads c s f(C), where k ads is a constant depending exponentially on the adsorption barrier. For small perturbations the adsorption rate can be linearized [72] r r ads ¼ Br ads =Bc s Þ ð eqc c s þ Br ads =BCÞ ð eqC C ð4:9Þ If the characteristic time of the bulk diffusion processes is much smaller than the time needed for the surfactant molecules to overcome the barrier, then the perturbation of the subsurface concentration is negligible (i.e. the subsurface concentration, c s , is equal to the bulk surfactant concentration) and the adsorption flux is proportional to C .…”

Section: Barrier-controlled Adsorptionmentioning

confidence: 99%

“…Laplace transformation with respect to time of the problem (4.2) -(4.3) was used. The obtained equations for the Laplace images of the concentration and the adsorption were solved and the inverse Laplace transformation of the solution was found in terms of the so-called ''plasma function'' [72]. Using this integral representation we obtain now the following expression for the scaled specific deformation, ( D :…”

Section: Surfactant Diffusion Toward Small Spherical Drops With Constmentioning

confidence: 99%

See 3 more Smart Citations

Interfacial rheology of adsorbed layers with surface reaction: On the origin of the dilatational surface viscosity

Ivanov

Danov

Ananthapadmanabhan

et al. 2005

Advances in Colloid and Interface Science

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Section: Barrier-controlled Adsorptionmentioning

confidence: 98%

Section: Barrier-controlled Adsorptionmentioning

confidence: 99%

Section: Barrier-controlled Adsorptionmentioning

confidence: 99%

Section: Surfactant Diffusion Toward Small Spherical Drops With Constmentioning

confidence: 99%

See 2 more Smart Citations

Interfacial rheology of adsorbed layers with surface reaction: On the origin of the dilatational surface viscosity

Ivanov

Danov

Ananthapadmanabhan

et al. 2005

Advances in Colloid and Interface Science

Self Cite

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“…Two t i values (t i t 2 ) indicate the presence of two relaxation mechanisms with widely different time scale for the adsorption of surfactant or protein molecules at the interface. Details on such behavior have been described elsewhere 31,32) . According to Equation ( ), we have calculated the t 1 and t 2 for the individual surfactant and protein systems with three different concentrations, and the results are present- …”

Section: Dynamic Surface Tension and Surface Dilatational Elasticity mentioning

confidence: 99%

Dynamic Surface Tension and Surface Dilatational Elasticity Properties of Mixed Surfactant/Protein Systems

et al. 2008

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We present the study on dynamic surface tension and surface dilatational elasticity properties of dilute aqueous systems of pentaglycerol fatty acid esters (pentaglycerol monostearate, C 18 G 5 , and pentaglycerol monooleate, C 18:1 G 5 ), whey protein, sodium caseinate, and mixed surfactant and protein at room temperature. The adsorption kinetics at the air-liquid interface has been studied by bubble pressure tensiometer and the oscillation bubble (rising drop) method. It has been shown that the dynamic surface tension curve basically presents two-regions; namely induction region and rapid fall region. During the induction time the adsorption is the diffusion-controlled process of amphiphilic surfactant or protein molecules from the bulk of the solution to the interface. Whey protein and sodium caseinate showed longer induction time 10000 ms compared to the surfactant systems, where induction time was estimated to be 1000 ms. However, in both the protein and surfactant systems, the induction time goes on decreasing with increasing the concentrations. The similar behavior was observed in the mixed system, and lower surface tension values were observed at higher concentrations. The fitting of the experimental data to the theoretical equation shows the presence of two relaxation mechanisms of widely different time scale for the adsorption of surfactant or protein molecules at the interface. The relaxation time strongly varies with the concentrations following the power law, and at fixed concentration it was the highest for whey protein and the lowest for C 18:1 G 5 system. The surface dilatational elasticity determined within the frequency range of 0.1 to 1 cycle/s supports the dynamic surface tension data.

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Impact of Micellar Kinetics on Dynamic Interfacial Properties of Surfactant Solutions

Miller

Noskov

Fainerman

et al. 2008

Highlights in Colloid Science

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Adsorption Relaxation for Nonionic Surfactants under Mixed Barrier-Diffusion and Micellization-Diffusion Control

Cited by 37 publications

References 26 publications

Interfacial rheology of adsorbed layers with surface reaction: On the origin of the dilatational surface viscosity

Interfacial rheology of adsorbed layers with surface reaction: On the origin of the dilatational surface viscosity

Dynamic Surface Tension and Surface Dilatational Elasticity Properties of Mixed Surfactant/Protein Systems

Impact of Micellar Kinetics on Dynamic Interfacial Properties of Surfactant Solutions

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