Adsorption of water-soluble polymers with surfactant character.

Díez‐Pascual, Ana M.; Compostizo, A.; Crespo-Colín, Amalia; Rubio, Ramón G.; Miller, R.

doi:10.1016/j.jcis.2006.11.056

Cited by 41 publications

(26 citation statements)

References 34 publications

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“…Theoretical calculations executed by computational fluid dynamics as well as adsorption experiments performed with PEG on SiO 2 support the existence of stagnation point flow in the cell design described in this paper. In all cases, these results are consistent with previous reports stating that the adsorption of PEG to silica surfaces can be considered a fast process controlled by the transport of the adsorbate to the surface, rather than the transfer from the subsurface to the interface [73]. In addition, the use of a setup-specific correction function that should be determined and applied to the experimental data in order to correct for the size of the measuring spot and for variations in mass transfer away from the stagnation point was proposed.…”

Section: Discussionsupporting

confidence: 92%

Determination of a setup correction function to obtain adsorption kinetic data at stagnation point flow conditions

Mora

Nejadnik

Baylon-Cardiel

et al. 2010

Journal of Colloid and Interface Science

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This paper is the first report on the characterization of the hydrodynamic conditions in a flow cell designed to study adsorption processes by spectroscopic ellipsometry. The resulting cell enables combining the advantages of in-situ spectroscopic ellipsometry with stagnation point flow conditions. An additional advantage is that the proposed cell features a fixed position of the "inlet tube" with respect to the substrate, thus facilitating the alignment of multiple substrates. Theoretical calculations were performed by computational fluid dynamics and compared with experimental data (adsorption kinetics) obtained for the adsorption of polyethylene glycol to silica under a variety of experimental conditions. Additionally, a simple methodology to correct experimental data for errors associated with the size of the measured spot and for variations of mass transfer in the vicinity of the stagnation point is herein introduced. The proposed correction method would allow researchers to reasonably estimate the adsorption kinetics at the stagnation point and quantitatively compare their results, even when using different experimental setups. The applicability of the proposed correction function was verified by evaluating the kinetics of protein adsorption under different experimental conditions.

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Section: Discussionsupporting

confidence: 92%

Determination of a setup correction function to obtain adsorption kinetic data at stagnation point flow conditions

Mora

Nejadnik

Baylon-Cardiel

et al. 2010

Journal of Colloid and Interface Science

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“…In fact, within this model, ω corresponds to an average value between the areas of two species, weighted on the basis of their amount within the surface layer and it is therefore expected to decrease with the increase of CTAB molecules in the surface layer. In addition, a reduction of the area of the complexes with the increase of the layer occupation could contribute to the above ω trend, which is typical of compounds with polymeric nature [48] or other flexible macromolecules. More information related to the interaction of CTAB with the components in seawater and its effects on the mechanical response of the liquid interface can be obtained by the investigation of the dilational surface rheology.…”

Section: Effect Of Surfactant On the Sw Interfacial Propertiesmentioning

confidence: 99%

Surfactant induced complex formation and their effects on the interfacial properties of seawater

Guzmán¹,

Santini²,

Benedetti³

et al. 2014

Colloids and Surfaces B: Biointerfaces

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“…Due to its simplicity, this short-time linear approximation equation has been widely used to date . Specifically, many researchers [10,[14][15][16][17]19,20,22,23,25,[27][28][29][30][31][32]34,35,37,38,40] have utilized the equation to evaluate surfactant diffusivities or determine the adsorption mechanism of various systems, linearly fitting dynamic surface tension data with the short-time linear approximation equation (c vs. t 1/2 ) for specific ranges of ''short'' time intervals (generally t 1/2 = 0-5s 1/2 , but up to t 1/2 = 200s 1/2 in [22]). A detailed literature review of these diffusivities, estimated by using the short-time approximation method, is reported in Table 1.…”

Section: Introductionmentioning

confidence: 99%

A study on the method of short-time approximation – Criteria for applicability

Casandra

Ismadji

Noskov

et al. 2015

International Journal of Heat and Mass Transfer

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Despite its widespread use in the determination of adsorption mechanisms and the estimation of surfactant diffusivity, the short-time approximation method, used for linearly fitting experimental dynamic surface tension data, should be validly applied only over a very specific range of time intervals or surface pressures. Therefore, the definition of general criteria for the applicability of this method and for error evaluation in diffusivity estimations is fundamental. In this work, a theoretical numerical simulation of the short-time approximation method was conducted, and general benchmarks for its accurate utilization were investigated. Specifically, for systems assuming planar gas-liquid surfaces, diffusion-controlled kinetics and a Langmuir adsorption isotherm, simple rules were developed in terms of limiting surface pressure (p max) and dimensionless time (t ⁄ max) as a function of dimensionless surfactant concentration (C 0 /a). For values greater than the limiting (maximal) conditions, the dynamic surface tension curve deviates from the short-time approximation straight line, and thus, the corresponding linear fitting could lead to significant errors in evaluating the diffusivity. The simple criteria proposed in this study thus precisely define the range of applicability for the short-time approximation method.

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Adsorption of water-soluble polymers with surfactant character.

Cited by 41 publications

References 34 publications

Determination of a setup correction function to obtain adsorption kinetic data at stagnation point flow conditions

Determination of a setup correction function to obtain adsorption kinetic data at stagnation point flow conditions

Surfactant induced complex formation and their effects on the interfacial properties of seawater

A study on the method of short-time approximation – Criteria for applicability

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