Short-time behavior of mixed diffusion-barrier controlled adsorption

Moorkanikkara, Srinivas Nageswaran; Blankschtein, Daniel

doi:10.1016/j.jcis.2005.09.057

Cited by 15 publications

(19 citation statements)

References 81 publications

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“…While a diffusion-controlled adsorption model contains one kinetics parameter: D, the bulk solution diffusion coefficient of the surfactant molecule, a mixed-controlled adsorption model contains two kinetics parameters: D and β, where β is the energy-barrier parameter representing the rate constant for the adsorption of surfactant molecules from the sub-surface onto the surface. As we have recently shown, β is related to the adsorption of a single surfactant molecule onto a clean surface [36].…”

Section: Introductionmentioning

confidence: 83%

“…Note that the equilibrium adsorption isotherm models differ in the manner in which they account for the interactions between the adsorbed surfactant molecules [36], and as such, they should not affect the value of D, the bulk solution diffusion coefficient of a surfactant molecule, and β, which as we have recently shown, is related to the adsorption of a single surfactant molecule onto a clean surface [36]. Moreover, note that the existing procedure uses the entire experimental DST data measured at all values of C b to regress for the values of D and β, and therefore, it does not allow for an independent testing of its predictive capabilities.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, the new methodology is based on the short-time analysis of the mixedcontrolled model that we presented recently in Ref. [36], an analysis which requires only the experimental short-time DST data measured at two initial surfactant bulk solution concentrations. The new methodology involves extracting adsorption kinetics-specific information from the experimental DST data, and then regressing for the values of the kinetics parameters, D and β.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New methodology to determine the rate-limiting adsorption kinetics mechanism from experimental dynamic surface tension data

Moorkanikkara

Blankschtein

2006

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New methodology to determine the rate-limiting adsorption kinetics mechanism from experimental dynamic surface tension data

Moorkanikkara

Blankschtein

2006

Journal of Colloid and Interface Science

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“…While the simplification is commonly reported in the literature, it should be noted that it is a nonphysical solution since it predicts an infinite flux at t = 0 [10]. However, Moorkanikkara and Blankschtein have shown that using a more accurate mixed energy barrier-diffusion control model also leads to an apparent t 1/2 dependence [10].…”

Section: Dynamic Surface Tensionmentioning

confidence: 99%

“…However, Moorkanikkara and Blankschtein have shown that using a more accurate mixed energy barrier-diffusion control model also leads to an apparent t 1/2 dependence [10]. Thus, for simplicity, the asymptotic limit of the simple diffusion model (4) is used.…”

Section: Dynamic Surface Tensionmentioning

confidence: 99%

Understanding Enhanced Boiling With Triton X Surfactants

Cho

Sresht

Blankschtein

et al. 2013

Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer In

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Heat transfer performance in pool boiling is largely dictated by bubble growth, departure, and number of nucleation sites. It is a well known phenomenon that adding surfactants can lower the liquid-vapor surface tension and increase the bubble departure frequency, thereby enhancing heat transfer. In addition to faster departure rates, surfactants are observed to dramatically increase the number of nucleation sites, which cannot be explained by simple surface tension arguments. Furthermore, it is not well understood which surfactant properties such as chemical composition and molecular structure affect boiling most significantly. From our experiments using Triton X-100 and Triton X-114 nonionic surfactants, we attribute boiling enhancement mainly to adsorption to the solid-liquid interface. Using the Mikic-Rohsenow model for boiling, a simple linear adsorption model, and the Cassie-Baxter description for contact angle, we developed a model that shows agreement with experimental results. This work offers some insights on how to predict boiling enhancement based on surfactant chemistry alone, which may aid in choosing optimal surfactants for boiling in the future.

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Dynamic surface tension and adsorption mechanism of surfactin biosurfactant at the air–water interface

Onaizi

2018

Eur Biophys J

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The dynamic adsorption of the anionic biosurfactant, surfactin, at the air-water interface has been investigated in this work and compared to those of two synthetic surfactants: the anionic sodium dodecylbenzenesulfonate (SDBS) and the nonionic octaethylene glycol monotetradecyl ether (CE). The results revealed that surfactin adsorption at the air-water interface is purely controlled by diffusion mechanism at the initial stage of the adsorption process (i.e., [Formula: see text]), but shifts towards a mixed diffusion-barrier mechanism when surface tension approaches equilibrium (i.e., [Formula: see text]) due to the development of an energy barrier for adsorption. Such energy barrier has been found to be a function of the surfactin bulk concentration (increases with increasing surfactin concentration) and it is estimated to be in the range of 1.8-9.5 kJ/mol. Interestingly, such a trend (pure diffusion-controlled mechanism at [Formula: see text] and mixed diffusion-barrier mechanism at [Formula: see text]) has been also observed for the nonionic CE surfactant. Unlike the pure diffusion-controlled mechanism of the initial surfactin adsorption, which was the case in the presence and the absence of the sodium ion (Na), SDBS showed a mixed diffusion-barrier controlled at both short and long time, with an energy barrier of 3.0-9.0 and 3.8-18.0 kJ/mol, respectively. Such finding highlights the nonionic-like adsorption mechanism of surfactin despite its negative charge.

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Short-time behavior of mixed diffusion-barrier controlled adsorption

Cited by 15 publications

References 81 publications

New methodology to determine the rate-limiting adsorption kinetics mechanism from experimental dynamic surface tension data

New methodology to determine the rate-limiting adsorption kinetics mechanism from experimental dynamic surface tension data

Understanding Enhanced Boiling With Triton X Surfactants

Dynamic surface tension and adsorption mechanism of surfactin biosurfactant at the air–water interface

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