Equilibrium Contact Angle and Adsorption Layer Properties with Surfactants

Thiele, Uwe; Snoeijer, Jacco H.; Trinschek, Sarah; John, Karin

doi:10.1021/acs.langmuir.8b00513

Cited by 35 publications

(45 citation statements)

References 49 publications

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“…For a hydrophilic substrate, the carryover of ionic or nonionic surfactants resulting in unusual wetting behavior (known as the “autophobing effect”) is evident and has been studied in detail. 24 − 27 In comparison to that of hydrophilic substrates, the carryover of surfactants on a hydrophobic substrate has been investigated less frequently. 17 , 28 Churaev et al carried out one of the first investigations of the spreading of a surfactant solution on a hydrophobic substrate.…”

Section: Resultsmentioning

confidence: 99%

Counteracting Interfacial Energetics for Wetting of Hydrophobic Surfaces in the Presence of Surfactants

Bera¹,

Carrier²,

Backus

et al. 2018

Langmuir

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Surface active agents (surfactants) are commonly used to improve the wetting of aqueous solutions on hydrophobic surfaces. The improved wettability is usually quantified as a decrease of the contact angle θ of a droplet on the surface, where the contact angle θ is given by the three surface tensions involved. Surfactants are known to lower the liquid–vapor surface tension, but what they do to the two other surface tensions is less clear. We propose an improved Zisman method for quantifying the wetting behavior of surfactants at the solid surface. This allows us to show that a number of very common surfactants do not change the wettability of the solid: they give the same contact angle as a simple liquid with the same liquid–vapor surface tension. Surface-specific sum-frequency generation spectroscopy shows that nonetheless surfactants are present at the solid surface. The surfactants therefore change the solid–liquid and solid–vapor surface tensions by the same amount, leading to an unchanged contact angle.

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Section: Resultsmentioning

confidence: 99%

Counteracting Interfacial Energetics for Wetting of Hydrophobic Surfaces in the Presence of Surfactants

Bera¹,

Carrier²,

Backus

et al. 2018

Langmuir

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show abstract

“…For instance, a concentration-dependent wetting potential gives a concentration-dependent Derjaguin pressure and also results in an additional Marangoni-type flux, affects diffusion, evaporation, and adsorption/desorption. The exploration of the possibilities of these gradient-dynamics models has only just started [96,97,117,119]. Future directions could include investigations of the coupling of wettability with structural phase transitions of surfactants or solutes, and studies of terrassed spreading of drops of nanosuspensions.…”

Section: Gradient Dynamics For Complex Liquidsmentioning

confidence: 99%

Recent advances in and future challenges for mesoscopic hydrodynamic modelling of complex wetting

Thiele

2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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We highlight some recent developments that widen the scope and reach of mesoscopic thin-film (or longwave) hydrodynamic models employed to describe the dynamics of thin films, drops and contact lines of simple and complex liquids on solid substrates. The basis of the discussed developments is the reformulation of various mesoscopic thin-film hydrodynamic models as gradient dynamics on underlying energy functionals. After briefly presenting the general approach, the following sections discuss how to improve these models by amending the energy functional and the mobility function, how to obtain gradient dynamics models for some complex liquids, and how to incorporate processes beyond relaxational dynamics.

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“…It exhibits a minimum at a small film height h a and thus for a horizontal substrate a macroscopic drop can coexist with a stable thin adsorption layer of height h a . The corresponding region outside the drop can be considered as macroscopically "dry" (see, e.g., the case of pure liquid in [46]). This corresponds to the "moist" case in [47].…”

Section: Mathematical Modelmentioning

confidence: 99%

Self-organized dip-coating patterns of simple, partially wetting, nonvolatile liquids

et al. 2019

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When a solid substrate is withdrawn from a bath of simple, partially wetting, nonvolatile liquid, one typically distinguishes two regimes, namely, after withdrawal the substrate is macroscopically dry or homogeneously coated by a liquid film. In the latter case, the coating is called a Landau-Levich film. Its thickness depends on the angle and velocity of substrate withdrawal. We predict by means of a numerical and analytical investigation of a hydrodynamic thin-film model the existence of a third regime. It consists of the deposition of a regular pattern of liquid ridges oriented parallel to the meniscus. We establish that the mechanism of the underlying meniscus instability originates from competing film dewetting and Landau-Levich film deposition. Our analysis combines a marginal stability analysis, numerical time simulations and a numerical bifurcation study via path-continuation.

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Equilibrium Contact Angle and Adsorption Layer Properties with Surfactants

Cited by 35 publications

References 49 publications

Counteracting Interfacial Energetics for Wetting of Hydrophobic Surfaces in the Presence of Surfactants

Counteracting Interfacial Energetics for Wetting of Hydrophobic Surfaces in the Presence of Surfactants

Recent advances in and future challenges for mesoscopic hydrodynamic modelling of complex wetting

Self-organized dip-coating patterns of simple, partially wetting, nonvolatile liquids

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