Stability of rectilinear contact lines

DeFazio, Jeff; Dyson, D. C.

doi:10.1016/0021-9797(90)90288-y

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…An example is shown in Figure 17, with the force curve of experiment type 2, section A, where a receding contact angle of 49. 3 was measured. The shape of the measured force curve corresponds nicely with the expected curve, the deviations are indicated with E, followed by a Roman number.…”

Section: Dewetting During Emersionmentioning

confidence: 99%

“…Recently, some theoretical and thermodynamic studies on the subject have been reported. [3][4][5] These studies focus on the energy balance to explain stability and instability of liquid boundaries at edges. As the theoretical framework and thermodynamic model involved are quite complex, either a 2D approach or an axisymmetric 3D approach is often used to decrease the complexity to a manageable level.…”

Section: Introductionmentioning

confidence: 99%

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Wetting forces and meniscus pinning at geometrical edges

2016

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It is shown that complications in currently used optical measurements for wetting and flow resistance over edges can be circumvented by surface tension force measurements. These forces are measured by employing a modified Wilhelmy plate testing technique in which a plate with rectangular holes is immersed. The forces measured during immersion and emersion are subdivided into mass, buoyancy, and surface tension related parts, where the flow resistance when the meniscus passes horizontal faces and edges of the plate receives particular attention. Combining this experimental method with wetting theory, we show that we can predict and measure the full force curve for meniscus shape transitions over edge geometries under quasi-static conditions. Moreover, wetting effects directly linked to surface defects can be detected qualitatively. We also point to the speed-dependent rupture of metastable films formed during emersion. The measurement method designed is most relevant in cases where optical methods cannot be used.

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Section: Dewetting During Emersionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wetting forces and meniscus pinning at geometrical edges

2016

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Wetting on a plate with three‐dimensional random roughness and heterogeneity

Katoh

Azuma

2001

Heat Trans. Asian Res.

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A theoretical study was conducted to investigate the wetting behavior of liquid meniscus on a vertical plate with three-dimensional random characteristics of heterogeneity and roughness. The thermodynamic stable condition was derived by considering the minimum of system free energy. The local stable condition leads to a result similar to that obtained for a plate with two-dimensional characteristics, that is, the system has many meta-stable states. For the stable condition of the whole system, a relation was derived between the macroscopically observed contact angle and the surface characteristics. The product of cosine of the contact angle and liquid surface tension is equal to the energy difference for the liquid to wet the plate by apparent unit area. If the liquid wets the solid surface reversibly, there is only one contact angle observed macroscopically. This fact suggests that the contact angle hysteresis is caused by the irreversible motion when the liquid advances or recedes on the solid surface. The well-known Cassies and Wenzels contact angles are explained as those corresponding to a thermodynamically stable condition when the liquid wets the solid reversibly.

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