A direct method for studying particle deposition onto solid surfaces

Dąbroś, Tadeusz; Ven, Theo G. M. van de

doi:10.1007/bf01415042

Cited by 260 publications

(262 citation statements)

References 21 publications

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“…Solutions were injected at a rate of 0.5 mL min -1 . The hydrodynamics of the wall-jet flow cell are well-defined, 21 as discussed in Part I of this work, and allow rapid exchange of the solution in contact with the silica surface.…”

Section: Methodsmentioning

confidence: 99%

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 2. CTAB and Triton X-100 Mixtures on Silica

2011

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractTotal internal reflection (TIR) Raman spectroscopy has been used to study the kinetics of adsorption, desorption and displacement of mixed surfactant systems at the silica-water interface.The limited penetration depth of the evanescent wave provides surface sensitivity while the chemical sensitivity of Raman scattering permits the determination of the time-dependent composition of the adsorbed film. Principal component analysis is used to deconvolute the Raman spectra with a time resolution of 2 s and a precision of 5% of a monolayer. Both equilibrium and kinetic measurements are presented for the cetyltrimethylammonium bromide (CTAB)/Triton X-100 system over a range of concentrations and compositions. For a total concentration of 2 mM, the adsorption isotherm shows strong synergistic behavior with the addition of small amounts of CTAB (~2% of the total surfactant) doubling the adsorbed amount of Triton X-100. This synergism has a marked influence on the kinetics: for example, when Triton X-100 replaces CTAB the Triton X-100 surface excess overshoots its equilibrium value and returns only very slowly to equilibrium. For systems above the cmc, the repartitioning of surfactant between micelles and monomers results in unexpected behavior during exchange or rinsing of mixed surfactant solutions. For example, during rinsing the more rapid diffusion of CTAB away from the surface leads to a local increase in the monomer concentration of Triton X-100 resulting in a temporary spike in the Triton X-100 surface excess. Displacement kinetics of CTAB by TX-100 and vice versa are generally slower than the adsorption or desorption of the pure surfactants, but cover a wide range of kinetic timescales depending on the details of the compositions and concentrations of the initial and final solutions.

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Section: Methodsmentioning

confidence: 99%

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 2. CTAB and Triton X-100 Mixtures on Silica

2011

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“…A stagnation-point flow chamber was used in this study, as described before in detail (Bakker et al, 2003a;Dabros & Van de Ven, 1983). The flow chamber was incorporated between two communicating vessels placed at different heights and containing the bacterial suspension, to create a pulsefree flow by hydrostatic pressure.…”

Section: Methodsmentioning

confidence: 99%

Multiple linear regression analysis of bacterial deposition to polyurethane coatings after conditioning film formation in the marine environment

et al. 2004

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Many studies have shown relationships of substratum hydrophobicity, charge or roughness with bacterial adhesion, although bacterial adhesion is governed by interplay of different physico-chemical properties and multiple regression analysis would be more suitable to reveal mechanisms of bacterial adhesion. The formation of a conditioning film of organic compounds adsorbed from seawater affects the properties of substratum surfaces prior to bacterial adhesion, which is a complicating factor in studying the mechanism of bacterial adhesion. In this paper, the impact of conditioning films adsorbed from natural seawater to four polyurethane coatings with different hydrophobicity, elasticity and roughness was studied for three different marine bacterial strains in a multiple linear regression analysis. The water contact angle on hydrophobic coatings decreased on average by 8 degrees and increased on average by the same amount on hydrophilic coatings. These changes were accompanied by increased concentrations of oxygen and nitrogen on the surface as determined by X-ray photoelectron spectroscopy, indicative of adsorption of proteinaceous material. Furthermore, the mean surface roughness increased on average by 4 nm after conditioning film formation. Multiple linear regression analysis revealed that changes in deposition due to conditioning film formation of Marinobacter hydrocarbonoclasticus, Psychrobacter sp. SW5H and Halomonas pacifica in a stagnation-point flow chamber could be explained in a model comprising hydrophobicity and the prevalence of nitrogen-rich components on the surface for the most hydrophobic strain. For the two more hydrophilic strains, deposition was governed by a combination of surface roughness and hydrophobicity. Elasticity was not a factor in bacterial adhesion to conditioning films.

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“…The convectivediffusion equation reduces to a one-dimensional mass transport equation on the axis of the capil-5 lary. 23 Provided that the diameter of the laser spot (∼ 20 µm in our experiments) is much smaller than the diameter of the capillary (∼ 2 mm), this geometry greatly simplifies the theoretical modeling. …”

Section: Introductionmentioning

confidence: 93%

“…Near the axis of symmetry (within < 20% of the tube radius and height) the fluid velocity in polar coordinates is given by 23 v r = αzr…”

Section: Modelingmentioning

confidence: 99%

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 1. Pure Surfactants on Silica

2011

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Total internal reflection Raman spectroscopy provides a sensitive probe of surfactants adsorbed at an interface. A visible laser passes through a silica hemisphere and reflects off the flat silica–water interface. An evanescent wave probes ∼100 nm of solution below the surface, and the Raman scattering from this region provides chemically specific information on the molecules present. Here we look at both equilibrium and kinetic aspects of the adsorption of the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the nonionic surfactant Triton X-100 in single-component systems. We use the well-defined wall jet geometry to provide known hydrodynamics for the adsorption process. The well-defined hydrodynamics allows us to model the mass transport of surfactant to the surface which is coupled with a kinetic model consistent with the Frumkin isotherm to produce a complete model of the adsorption process. The fit between this model and the experimental results provides insight into the interactions on the surface.

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A direct method for studying particle deposition onto solid surfaces

Cited by 260 publications

References 21 publications

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 2. CTAB and Triton X-100 Mixtures on Silica

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 2. CTAB and Triton X-100 Mixtures on Silica

Multiple linear regression analysis of bacterial deposition to polyurethane coatings after conditioning film formation in the marine environment

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 1. Pure Surfactants on Silica

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