The Apparent Contact Angle of Liquids on Finely-Grooved Solid Surfaces-A SEM Study

Oliver, J. F.; Huh, Chun; Mason, S. G.

doi:10.1080/00218467608075085

Cited by 80 publications

(34 citation statements)

References 5 publications

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“…This phenomenon was used to enhance the water repellency of textiles [1][2][3]. Recent work with high energy substrates and liquids [5][6][7][8] has shown that similar effects occur, and this paper describes a study related to the development of foundry materials and brazing techniques.…”

Section: Introductionmentioning

confidence: 87%

Some effects of substrate roughness on wettability

Hitchcock¹,

Carroll²,

Nicholas³

1981

J Mater Sci

202

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The influence of substrate roughness on wettability has been investigated at room and high temperatures using sixteen material combinations, mostly liquid metals and solid ceramics but also water, glycerol and solid nickel. The contact angles assumed by both wetting and non-wetting drops of all but two material combinations increased linearly with the relative steepness of the surface features, the effect being less for experiments conducted at high temperatures. In contrast, the contact angles of good wetting drops of glycerol and exceptionally good wetting drops of Easy-rio decreased when their silica and nickel substrates were roughened. Similarly, contact angles of both wetting and nonwetting drops were decreased by ultrasonic vibration. The experimental data can best be interpreted in terms of the metastable equilibrium configuration models in which an advancing liquid front has to overcome energy barriers associated with surface features. This occurs more readily if these barriers are small relative to the energy of the liquid which our data suggest can be equated with the enthalpy of the liquid. This interpretation enables the effects of substrate roughness at one temperature or with one liquid to be used to predict behaviour at other temperatures and with other liquids.

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Section: Introductionmentioning

confidence: 87%

Some effects of substrate roughness on wettability

Hitchcock¹,

Carroll²,

Nicholas³

1981

J Mater Sci

202

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show abstract

“…As shown in the figure, the macroscopically observed angles can be expected to show a large difference between the leading and trailing edges of the droplet. However, if one were to microscopically observe the angles of contact, relative to the local features of the surface, then it is likely that all of the observed angles would be the same, supporting the use of a single value, as in the Young equation (Oliver et al 1977).…”

Section: Effects Of Surface Roughnessmentioning

confidence: 99%

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

Hubbe

Rojas

Fingas³

et al. 2013

BioResources

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“…la) can influence spreading behaviour significantly, particularly with the higher wetting liquid. The extent of this capillary channelling on machined metal surfaces is highly dependent on the orientation and texture of the roughness, as was found by Parker and Smoluchowski [11], Bikerman [12], Bascom et al [13] and more recently demonstrated by Patrick and Brown [14] and Oliver et al [10,15] using an involatile liquid in an SEM.…”

mentioning

confidence: 72%

Liquid spreading on rough metal surfaces

Oliver

Mason

1980

J Mater Sci

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The influence of surface roughness on the equilibrium spreading of liquids on aluminium and stainless steel surfaces with well-characterized rough machine finishes and a welldefined technique of attaining liquid drop equilibrium has been experimentally studied. The surfaces were prepared under practical conditions, i.e. without rigorous purification or attempting to eliminate anisotropy or microheterogeneities in surface-free energy. Depending on the type of roughness, i.e. spiral-grooved, radial-grooved and porous, the advancing contact angle was in approximate agreement with one of the classical contact angle/surface roughness equations. Capillary channelling along machine grooves profoundly affected the spreading and wetting behaviour and was highly dependent on the orientation and texture of roughness. Although the observed spreading was generally smooth on all surfaces it was probable that microscopic surface asperities produce smallscale non-equilibrium contact line movements and are responsible for the extensive wetting hysteresis during drop retraction.

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The Apparent Contact Angle of Liquids on Finely-Grooved Solid Surfaces-A SEM Study

Cited by 80 publications

References 5 publications

Some effects of substrate roughness on wettability

Some effects of substrate roughness on wettability

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

Liquid spreading on rough metal surfaces

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