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Contact Angle and Local Wetting at Contact Line
Langmuir, 2012This theoretical study was motivated by recent experiments and theoretical work that had suggested the dependence of the static contact angle on the local wetting at the triple-phase contact line. We revisit this topic because the static contact angle as a local wetting parameter is still not widely understood and clearly known.
Ri, Li, Yanguang, Shan
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Contact Angles on Spherical Surfaces
Langmuir, 2008In this paper, we explore the influence of curved surfaces on contact angles. Small liquid drops were deposited at the apex of spheres. Liquid was added to advance the contact line (or withdrawn to cause recession). As drop volume increased, the contact line advanced outward and downward.
C W, Extrand, Sung In, Moon
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A new model for the formation of contact angle and contact angle hysteresis
Chinese Physics B, 2010The formation mechanism of the contact angle and the sliding angle for a liquid drop on a solid surface plays an important role in producing hydrophobic surfaces. A new half soakage model is established in this paper as a substitute for Wenzel (complete soakage) and Cassie (no soakage) models.
Gong Mao-Gang +2 more
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Contact Angle Saturation in Electrowetting
The Journal of Physical Chemistry B, 2005Electrowetting is the phenomenon of contact angle decrease under the influence of an external voltage applied across the solid/liquid interface. Electrowetting offers an interesting possibility to enhance the wettability of hydrophobic materials without altering the chemical composition of the system and thus could be incorporated in various ...
Anthony, Quinn +2 more
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Pressure Dependence of the Contact Angle
The Journal of Physical Chemistry B, 2007When a liquid and its vapor contact a smooth, homogeneous surface, Gibbsian thermodynamics indicates that the contact angle depends on the pressure at the three-phase line of an isothermal system. When a recently proposed adsorption isotherm for a solid-vapor interface is combined with the equilibrium conditions and the system is assumed to be in a ...
Jiyu, Wu, T, Farouk, C A, Ward
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Contact angles on particles and plates
Colloids and Surfaces, 1987Abstract Contact angles on partially methylated quartz plates and particles of known surface coverage have been measured as a function of surface coverage and compared with predictions based on the Cassie equation. Advancing and receding water-contact angles on quartz plates have been determined by the captive-bubble and sessile-drop methods ...
Crawford, R., Koopal, L.K., Ralston, J.
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Dynamic Contact Angles and Contact Angle Hysteresis of Plasma Polymers
Langmuir, 1994Dynamic advancing and receding contact angles and the contact angle hysteresis for different plasma polymers deposited on microscope cover glasses were investigated by the Wilhelmy plate method. The hysteresis loops observed by this dynamic method show two major factors: (1) the meniscus change at the transition region; (2) the wettability change of ...
J.-H. Wang +3 more
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Soft contact: measurement and interpretation of contact angles
Soft Matter, 2006The measurement and interpretation of contact angles deceptively appear to be simple. This paper attempts to summarize the pitfalls in the field, and how to avoid them. First, the fundamental underlying theory that is necessary in order to properly measure and interpret contact angles is discussed, emphasizing recent developments.
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Hysteresis, entrapment and contact angle
1984Cumulative volume curves generated by intruding mercury into porous samples are not followed as the pressure is lowered and mercury extrudes out of the pores. In all cases, the depressurization curve lies above the pressurization curve and the hysteresis loop does not close even when the pressure is returned to zero, indicating that some mercury is ...
S. Lowell, Joan E. Shields
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Influence of surface roughness on contact angle hysteresis and spreading work
Colloid and Polymer Science, 2020Junchao Wang +4 more
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