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

Moorkanikkara, Srinivas Nageswaran; Blankschtein, Daniel

doi:10.1016/j.jcis.2006.06.022

Cited by 16 publications

(19 citation statements)

References 82 publications

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“…Quantitatively, the values we obtain for the adsorption rates provide estimates of the concentration cutoff above which the adsorption changes from diffusion limited to transfer limited. 22 This concentration is expressed as…”

Section: Discussionmentioning

confidence: 99%

Microfluidic Dynamic Interfacial Tensiometry (μDIT)

2014

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We designed, developed and characterized a microfluidic method for the measurement of surfactant adsorption kinetics via interfacial tensiometry on a microfluidic chip. The principle of the measurement is based on the deformability of droplets as a response to hydrodynamic forcing through a series of microfluidic expansions. We focus our analysis on one perfluoro surfactant molecule of practical interest for droplet-based microfluidic applications. We show that although the adsorption kinetics is much faster than the kinetics of the corresponding pendant drop experiment, our droplet-based microfluidic system has a sufficient time resolution to obtain quantitative measurement at the sub-second time-scale on nanoliter droplet volumes, leading to both a gain by a factor of ∼10 in time resolution and a downscaling of the measurement volumes by a factor of ∼1000 compared to standard techniques. Our approach provides new insight into the adsorption of surfactant molecules at liquid-liquid interfaces in a confined environment, relevant to emulsification, encapsulation and foaming, and the ability to measure adsorption and desorption rate constants.

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Section: Discussionmentioning

confidence: 99%

Microfluidic Dynamic Interfacial Tensiometry (μDIT)

2014

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“…The diffusion coefficient of C 12 E 8 has been obtained previously using several independent techniques. We take the average value corresponding to several reported values, D = 3.8 Â 10 À10 m 2 /s [33,36,37]. The diffusion coefficient for C 10 E 8 and C 14 E 8 were calculated using the diffusion coefficient of C 12 E 8 and the scaling with molecular weight given by D $ M 1/2 , which has previously been used for low molecular weight surfactants [36,38].…”

Section: Methodsmentioning

confidence: 99%

The effect of alkane tail length of C E8 surfactants on transport to the silicone oil–water interface

Alvarez

Lee

Walker

et al. 2011

Journal of Colloid and Interface Science

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“…Surfactant adsorption to liquid-liquid interfaces from a bulk phase can be divided into three discrete steps: (1) Mass transfer (diffusion and/or convection) of surfactant molecules from the bulk to the depletion length (i.e. a layer with thickness of only a few molecular diameters or angstroms below the interface layer) [49]; (2) Kinetic adsorption of surfactant to the interface [12,50];…”

Section: Drop Formation Times In Relation To Surfactant Kineticsmentioning

confidence: 99%