Surface forces and wetting phenomena

Starov, Victor; Velarde, Manuel G.

doi:10.1088/0953-8984/21/46/464121

Cited by 98 publications

(127 citation statements)

References 11 publications

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“…The equilibrium profile of a sessile two dimensional droplet is described by the following equation [1,2,5]:…”

Section: Equilibrium Contact Angle Of Sessile Droplets and Surface Fomentioning

confidence: 99%

“…(7), hence, should be one extra condition on the solutions of Eq. (7) [1,2]: this extra condition allows to express the contact angle vis disjoining pressure isotherm.…”

Section: Equilibrium Contact Angle Of Sessile Droplets and Surface Fomentioning

confidence: 99%

“…It is possible to show [1,2] that the height of equilibrium sessile drops, H, decreases with increasing oversaturation, when the absolute value of P e increases. It follows also from Kelvin's equation (6): the small droplets (with low sizes R e and H) are characterized by higher pressure, P e , and high oversaturation ratio, p s /p.…”

Section: Equilibrium Contact Angle Of Sessile Droplets and Surface Fomentioning

confidence: 99%

“…(5) [1,2] shows that it determines a single, unique equilibrium contact angle (at fixed external conditions). Experiments, however, show presence of contact angle hysteresis with an infinite number of apparent "quasi-equilibrium positions"…”

Section: Static Hysteresis Of Contact Angle Of Sessile Droplets On Smmentioning

confidence: 99%

“…Earlier a theory of contact angle hysteresis of menisci in thin capillaries has been developed [1,2] based on a s-shape of disjoining/conjoining pressure isotherm. The nature of the disjoining/conjoining pressure can be briefly explained as follows.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The equilibrium profile of a sessile two dimensional droplet is described by the following equation [1,2,5]:…”

Section: Equilibrium Contact Angle Of Sessile Droplets and Surface Fomentioning

confidence: 99%

“…(7), hence, should be one extra condition on the solutions of Eq. (7) [1,2]: this extra condition allows to express the contact angle vis disjoining pressure isotherm.…”

Section: Equilibrium Contact Angle Of Sessile Droplets and Surface Fomentioning

confidence: 99%

Section: Equilibrium Contact Angle Of Sessile Droplets and Surface Fomentioning

confidence: 99%

Section: Static Hysteresis Of Contact Angle Of Sessile Droplets On Smmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Kuchin

Starov

2015

Langmuir

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Heterogeneous Nucleation on a Completely Wettable Substrate

Iwamatsu¹

2013

Advances in Contact Angle, Wettability and Adhesion

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It is widely believed that heterogeneous nucleation occurs without an activation process when the surface is completely wettable. In this report, we review our previous work [J.Chem.Phys 134, 234709 (2011)] to show that the critical nucleus (droplet) can exist and the activation process may be observable. In fact, a critical nucleus and a free energy barrier always exist if the surface potential or the disjoining pressure allows for the firstorder pre-wetting transition on a completely wettable substrate where the contact angle is zero. Furthermore, the critical nucleus changes character from the critical nucleus of surface phase transition below bulk coexistence (undersaturation) to the critical nucleus of bulk heterogeneous nucleation above the coexistence (oversaturation) when it crosses the coexistence. In this paper the morphology and work of formation of a critical nucleus on a completely-wettable substrate are re-examined to point out the possibility of observing a critical droplet on a completely wettable substrate. *

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Droplet Retention on Superhydrophobic Surfaces: A Critical Review

Jiang

Choi

2020

Adv Materials Inter

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Wetting phenomena and superhydrophobic surfaces are ubiquitous in nature and have recently been explored widely in scientific and engineering applications. The understanding and control of surface superhydrophobicity are not only fundamentally intriguing but also practically important to provide unique and regulated functionalities to natural species and industrial applications. Here, the fundamentals of wetting phenomena are critically reviewed that especially apply to superhydrophobicity, putting an emphasis on the clarification of contact angles, the quantification of droplet retention force, and the role of contact line. The fundamentals of how the droplet retention is determined by the surface features are discussed and advanced analytical models for the prediction of contact angles and retentive forces are introduced. Applications are further discussed whose functionalities largely depend on the droplet retention, including directional droplet transport, anti‐icing, and water harvesting.

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Surface forces and wetting phenomena

Cited by 98 publications

References 11 publications

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

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

Heterogeneous Nucleation on a Completely Wettable Substrate

Droplet Retention on Superhydrophobic Surfaces: A Critical Review

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