Adsorption kinetics at air/solution interface studied by maximum bubble pressure method

Liu, Junji; Chuang-ye, Wang; Messow, U.

doi:10.1007/s00396-004-1107-2

Cited by 9 publications

(8 citation statements)

References 10 publications

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“…This resulted in accurate expressions of the dynamic surface adsorption for the following cases: (1) short-time limit adsorption (no-back diffusion), (2) adsorption with back diffusion, and (3) long-time limit adsorption. The following equations give the dynamic surface adsorption onto a spherical interface within the short- and long-time approximation, respectively: normalΓ ( t ) = D C 0 t r 0 + 2 C 0 D t π .25ex2ex .25ex2ex normalΓ ( t ) = ( C 0 − C s ) D r 0 ( t + 2 r 0 t D π ) + Q ( t ≥ t 1 ) where r 0 is radius of capillary, t 1 is a given long time at which the concentration at the subsurface has reached a constant value of C s , and Q is only a function of t 1 and C s .…”

Section: Experimental Sectionmentioning

confidence: 99%

Dynamic Adsorption of Organic Compounds Dissolved in Synthetic Produced Water at Air Bubbles: The Influence of the Ionic Composition of Aqueous Solutions

Eftekhardadkhah

Øye

2013

Energy Fuels

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A detailed analysis of the dynamic adsorption of crude oil components dissolved in produced water onto air bubble surfaces is presented. Synthetic produced water was prepared using three crude oils and aqueous solutions with varying ionic composition. The total organic carbon content, molecular mass, and dynamic surface tension was determined for the samples. A modified version of the Ward−Tordai model was used to evaluate the experimental data. This allowed for determination of the characteristic diffusion coefficients and investigation of the adsorption mechanisms. The adsorption process was diffusion-controlled on short time scales, while adsorption barriers occurred on longer time scales. The presence of salts in the aqueous solutions had a strong influence on the time at which deviations from diffusion-controlled kinetics took place. This was explained in terms of salting-out of larger hydrocarbons. The presence of divalent cations did not have a major influence on the salting-out effect nor the time where the adsorption barrier appeared.

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Section: Experimental Sectionmentioning

confidence: 99%

Dynamic Adsorption of Organic Compounds Dissolved in Synthetic Produced Water at Air Bubbles: The Influence of the Ionic Composition of Aqueous Solutions

Eftekhardadkhah

Øye

2013

Energy Fuels

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“…The subsurface is defined as the surface of the spherical region outside the semi-spherical forming bubble with diameter equal to the capillary. Following the procedure by Liu et al (2004), which is reported in detail in Appendix A, the diffusion equation…”

Section: Transient Surface Accumulationmentioning

confidence: 99%

“…A.1). Following the procedure by Liu et al (2004), the Ward and Tordai equation can be written in spherical coordinates by solving the diffusion equation…”

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confidence: 99%

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Effects of interfacial surfactant contamination on bubble gas transfer

Rosso

Huo

Stenstrom

2006

Chemical Engineering Science

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Surface active agents depress gas transfer at gas-liquid interfaces. They are present as measurable trace contaminants at all environmental and at most industrial interfaces. An experimental apparatus to concurrently measure dynamic surface tension and mass transfer was constructed and tested for single-bubble and multi-bubble experiments. In this work, the parameters describing time-dependent bubble surface contamination were characterized. The application of a Ward-Tordai transient model and of a Langmuir saturation model showed that for fine-bubbles in low molecular weight surfactant solutions the interfacial surfactant accumulation equilibrates before bubble detachment. This is reflected in the bubbles behaving as solid-spheres, which is shown in our dimensionless results.For a given contamination, interfaces with higher renewal rates have higher mass transfer. At higher renewal rates, the variation due to different contamination is smaller than the variation at lower renewal rates, concluding that higher interfacial flow regimes can offset contamination. Our experimental evidence shows a gas transfer reduction of 30-70% of pure water values in surfactant solutions, which confirms full-scale field measurements. Results are consistent with expectations and correct previous Frössling-like dimensionless correlations for pure water systems. Our results offer a tool for mass transfer prediction from flow regime and surfactant properties. ᭧

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“…The adsorption time scale for most of the known surfactants (we treat the impurities as surfactants) is of the order of few seconds and consequently the surface tension attains the reduced value in this time [31][32][33]. On the contrary, the typical time scale that can be ascribed to the formation or morphological changes (if any) of the surface nanobubbles is at least of the order of 10 minutes [5,34,35].…”

Section: Introductionmentioning

confidence: 99%

Effect of impurities in description of surface nanobubbles

Das

Snoeijer²,

Lohse³

2010

Phys. Rev. E

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Surface nanobubbles emerging at solid-liquid interfaces of submerged hydrophobic surfaces show extreme stability and very small (gas-side) contact angles. In a recent study Ducker (W. A. Ducker, Langmuir 25, 8907 (2009).) conjectured that these effects may arise from the presence of impurities at the air-water interface of the nanobubbles. In this paper we present a quantitative analysis of this hypothesis by estimating the dependence of the contact angle and the Laplace pressure on the fraction of impurity coverage at the liquid-gas interface. We first develop a general analytical framework to estimate the effect of impurities (ionic or non-ionic) in lowering the surface tension of a given air-water interface. We then employ this model to show that the (gas-side) contact angle and the Laplace pressure across the nanobubbles indeed decrease considerably with an increase in the fractional coverage of the impurities, though still not sufficiently small to account for the observed surface nanobubble stability. The proposed model also suggests the dependencies of the Laplace pressure and the contact angle on the type of impurity.3

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Adsorption kinetics at air/solution interface studied by maximum bubble pressure method

Cited by 9 publications

References 10 publications

Dynamic Adsorption of Organic Compounds Dissolved in Synthetic Produced Water at Air Bubbles: The Influence of the Ionic Composition of Aqueous Solutions

Dynamic Adsorption of Organic Compounds Dissolved in Synthetic Produced Water at Air Bubbles: The Influence of the Ionic Composition of Aqueous Solutions

Effects of interfacial surfactant contamination on bubble gas transfer

Effect of impurities in description of surface nanobubbles

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