Impact of air and water vapor environments on the hydrophobicity of surfaces

Weisensee, Patricia B.; Neelakantan, Nitin K.; Suslick, Kenneth S.; Jacobi, Anthony M.; King, William P.

doi:10.1016/j.jcis.2015.04.060

Cited by 16 publications

(17 citation statements)

References 46 publications

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“…We assume, this change follows similar behaviour as θ w , hence in Fig.2(b) we connect θ DI,w to θ * with a dashed line parallel to the evaporation of single phase water drop evaporation passing through θ DI,a and θ DI,sat . As observed for saturated environment wettability studies 46 , the saturated vapour not only maintains the contact angle closer to theoretically predicated Young's angle, but also circumvent the decrements in the contact angle due to evaporation 46,47 . During the outer water drop evaporation the surrounding medium for the inner drop gets saturated with the water vapour which further gets adsorbed on the solid surface.…”

Section: Double Drop's Disparity From Single Dropsupporting

confidence: 54%

Double-Emulsion Drop Evaporation and Formation of a Daughter Droplet

Rahman

Waghmare

2019

Langmuir

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In this study, we present experimental and theoretical analyses of double emulsion drop evaporation. After the apparent completion of evaporation of the inner phase of a double emulsion drop, surprisingly, a resurfacing of a daughter droplet is observed. We further investigated to hypothesize this phenomenon which allowed us to obtain a prolonged fixed contact line evaporation for a single phase drop along with similar occurrence of resurfacing as of the double emulsion drops.

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Section: Double Drop's Disparity From Single Dropsupporting

confidence: 54%

Double-Emulsion Drop Evaporation and Formation of a Daughter Droplet

Rahman

Waghmare

2019

Langmuir

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“…The presence of air and the no saturation condition of the gas phase (vapor and air) can induce inaccuracy on the equilibrium contact angle measurement, as reported by Weisensee et al . 31 . A specific procedure to evaluate the ECA at medium high temperature is proposed in this paper.…”

Section: Methodsmentioning

confidence: 99%

A new model to predict the influence of surface temperature on contact angle

Villa

Marengo

Coninck

2018

Sci Rep

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The measurement of the equilibrium contact angle (ECA) of a weakly evaporating sessile drop becomes very challenging when the temperatures are higher than ambient temperature. Since the ECA is a critical input parameter for numerical simulations of diabatic processes, it is relevant to know the variation of the ECA with the fluid and wall temperatures. Several research groups have studied the effect of temperature on ECA either experimentally, with direct measures, or numerically, using molecular dynamic simulations. However, there is some disagreement between the authors. In this paper two possible theoretical models are presented, describing how the ECA varies with the surface temperature. These two models (called Decreasing Trend Model and Unsymmetrical Trend Model, respectively) are compared with experimental measurements. Within the experimental errors, the equilibrium contact angle shows a decrease with increasing surface temperatures on the hydrophilic surface. Conversely the ECA appears approximately constant on hydrophobic surfaces for increasing wall temperatures. The two conclusions for practical applications for weakly evaporating conditions are that (i) the higher the ECA, the smaller is the effect of the surface temperature, (ii) a good evaluation of the decrease of the ECA with the surface temperature can be obtained by the proposed DTM approach.

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“…Thus far, the surface property of a bulky matter has extensively been studied on Rf compounds [5][6][7][8][9][10] ; whereas very few properties of a single Rf group have been reported.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Adsorbed Molecular Water on the Surface of a Stretched Polytetrafluoroethylene Tape Analyzed by ¹H NMR

2016

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A single molecule often exhibits a largely different material character from a bulk matter. Although a perfluoroalkyl (Rf) compound is a representative one, many interests have mostly been devoted to the bulk character only thus far, leaving the single molecular character unclear. Recently, a new theoretical framework, stratified dipole-arrays (SDA) theory, has appeared for comprehensive understanding of Rf compounds in terms of both single and bulk systems. On this theory, a mechanically stretched polytetrafluoroethylene (PTFE) is expected to exhibit a single-molecular character having dipole-driven properties, which should attract molecular water. In the present study, a stretched PTFE tape is revealed to attract molecular water (not water droplet) in fact, and the adsorbed water molecules are highly restricted in motion by the dipole-dipole interaction studied by using (1)H NMR, which agrees with the prediction by the SDA theory.

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Impact of air and water vapor environments on the hydrophobicity of surfaces

Cited by 16 publications

References 46 publications

Double-Emulsion Drop Evaporation and Formation of a Daughter Droplet

Double-Emulsion Drop Evaporation and Formation of a Daughter Droplet

A new model to predict the influence of surface temperature on contact angle

Characterization of Adsorbed Molecular Water on the Surface of a Stretched Polytetrafluoroethylene Tape Analyzed by ¹H NMR

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Impact of air and water vapor environments on the hydrophobicity of surfaces

Cited by 16 publications

References 46 publications

Double-Emulsion Drop Evaporation and Formation of a Daughter Droplet

Double-Emulsion Drop Evaporation and Formation of a Daughter Droplet

A new model to predict the influence of surface temperature on contact angle

Characterization of Adsorbed Molecular Water on the Surface of a Stretched Polytetrafluoroethylene Tape Analyzed by 1H NMR

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Product

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Characterization of Adsorbed Molecular Water on the Surface of a Stretched Polytetrafluoroethylene Tape Analyzed by ¹H NMR