An Experimental Study of Contact Angle Hysteresis

Extrand, C. W.; Kumagai, Yaomi

doi:10.1006/jcis.1997.4935

Cited by 321 publications

(258 citation statements)

References 57 publications

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“…This agrees with the statement that low-energy solid surfaces are hydrophobic. 25,26 The behavior observed in Fig. 7 can be attributed to an increase in the induced charge density at the anodic surface and it agrees with experimental results obtained recently by Aronov et al 27 for low-energy electron irradiation of vitreous silica surfaces.…”

Section: Discussionsupporting

confidence: 89%

Compositional and structural changes at the anodic surface of thermally poled soda-lime float glass

Ziemath¹,

Araújo²,

Escanhoela³

2008

Journal of Applied Physics

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Applying high dc electric fields at elevated temperatures on silicate glasses results in displacement of ions, causing compositional and structural changes in the anodic surface. In this work, the ionic displacement was accompanied by electric current measurements during poling. The thickness of the Na + depletion layer calculated from the current curves agrees with the thickness measured by EDS only if displacement of Ca 2+ and O − are also taken into account. A depletion of Ca 2+ in the anodic surface has in fact been observed. Structural changes were confirmed by infrared diffuse and specular reflectance spectroscopies. A narrowing of the band at about 1070 cm −1 can be attributed to an increase in the structural ordering degree. Refractive index measurements confirm compositional changes and contact angle measurements indicate the existence of a negative charge density at the anodic surface.

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Section: Discussionsupporting

confidence: 89%

Compositional and structural changes at the anodic surface of thermally poled soda-lime float glass

Ziemath¹,

Araújo²,

Escanhoela³

2008

Journal of Applied Physics

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“…Over the last years there have been an increasing number of publications which confirmed the presence of contact angle hysteresis even on smooth, homogeneous surfaces [8][9][10][11][12][13]. The most convincing evidence for the presence of the above mentioned phenomenon is its presence on free liquid films [14][15][16][17][18][19].…”

Section: Hysteresis Of Contact Angle On Smooth Homogeneous Substratesmentioning

confidence: 99%

Hysteresis of Contact Angle of Sessile Droplets on Smooth Homogeneous Solid Substrates via Disjoining/Conjoining Pressure

Kuchin

Starov

2015

Langmuir

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A theory of contact angle hysteresis of liquid droplets on smooth, homogeneous solid substrates is developed in terms of shape of disjoining/conjoining pressure isotherm and quasi-equilibrium phenomena. It is shown that all contact angles, θ, in the range r θ <θ< a θ , which are different from the unique equilibrium contact angle θ ≠ e θ , correspond to the state of slow "microscopic" advancing or receding motion of the liquid if e θ <θ< a θ or r θ <θ< e θ , respectively. This "microscopic" motion almost abruptly becomes fast "macroscopic"advancing or receding motion after the contact angle reaches the critical values a θ or r θ , correspondingly. The values of the static receding, r θ , and static advancing, a θ , contact angles in cylindrical capillaries were calculated earlier, based on the shape of disjoining/conjoining pressure isotherm. It is shown now that both advancing and receding contact angles of a droplet on a on smooth, homogeneous solid substrate (i) can be calculated based on shape of disjoining/conjoining pressure isotherm, (ii) both advancing and receding contact angles depend on the drop volume and are not unique characteristics of the liquid-solid system. The latter is different from advancing/receding contact angles in thin capillaries. It is shown also that the receding contact angle is much closer to equilibrium contact angle than the advancing contact angle. The latter conclusion is unexpected and is in a contradiction with commonly accepted view that the advancing contact angle can be taken as the first approximation for the equilibrium contact angle. The dependency of hysteresis contact angles on the drop volume has a direct experimental confirmation.

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“…In order to understand how the partial wetting is possible in this case, Starov and Velarde discussed more complicated forms of disjoining pressure, comprising the London-van der Waals, double layer and structural contributions given by Eqs. (29), (30). They considered more complicated disjoining pressure isotherms, such as those depicted in Fig.…”

Section: Considering the Influence Of Absorbed Liquid Layers And The mentioning

confidence: 99%

Physics of solid–liquid interfaces: From the Young equation to the superhydrophobicity (Review Article)

Bormashenko

2016

Low Temperature Physics

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The state-of-art in the field of physics of phenomena occurring at solid/liquid interfaces is presented. The notions of modern physics of wetting are introduced and discussed including: the contact angle hysteresis, disjoining pressure and wetting transitions. The physics of low temperature wetting phenomena is treated. The general variational approach to interfacial problems, based on the application of the transversality conditions to variational problems with free endpoints is presented. It is demonstrated that main equations, predicting contact angles, namely the Young, Wenzel and Cassie-Baxter equations arise from imposing the transversality conditions on the appropriate variational problem of wetting. Recently discovered effects such as superhydrophobicity, the rose petal effect and the molecular dynamic of capillarity are reviewed.

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An Experimental Study of Contact Angle Hysteresis

Cited by 321 publications

References 57 publications

Compositional and structural changes at the anodic surface of thermally poled soda-lime float glass

Compositional and structural changes at the anodic surface of thermally poled soda-lime float glass

Hysteresis of Contact Angle of Sessile Droplets on Smooth Homogeneous Solid Substrates via Disjoining/Conjoining Pressure

Physics of solid–liquid interfaces: From the Young equation to the superhydrophobicity (Review Article)

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