Results 221 to 230 of about 14,224 (261)
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A Thermodynamic Model for Contact Angle Hysteresis
Journal of Colloid and Interface Science, 1998Thermodynamic expressions for the free energy of contact angle hysteresis have been derived assuming that wetting can be modeled as an adsorption-desorption process. The cause of hysteresis is not specified; it could be due to surface imperfections or simply irreversible interaction of the contact liquid and solid.
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A model for contact angle hysteresis
The Journal of Chemical Physics, 1984We discuss the behavior of a liquid partially wetting a solid surface, when the contact angle at equilibrium θ0 is small, but finite. The solid is assumed to be either flat, but chemically heterogeneous (this in turn modulating the interfacial tensions), or rough.
Joanny, J.-F., Gennes, P. G.
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Contact Angle Hysteresis on Aquagels
AIChE/SPE Joint Symposium on Wetting and Capillarity in Fluid Displacement Processes, 1959AIChE-SPE Joint Symposium on Wetting and Capillarity in Fluid Displacement Processes, 17–20 May, Kansas City, Missouri Summary Micrographic studies of drops of methylene iodide on agar aqua gel surfaces reveal substantial contact - angle hysteresis, which is virtually independent of agar concentration.
A.S. Michaels, R.C. Lummis
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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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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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Contact-Angle Hysteresis on Super-Hydrophobic Surfaces
Langmuir, 2004The relationship between perturbations to contact angles on a rough or textured surface and the super-hydrophobic enhancement of the equilibrium contact angle is discussed theoretically. Two models are considered. In the first (Wenzel) case, the super-hydrophobic surface has a very high contact angle and the droplet completely contacts the surface upon
G, McHale, N J, Shirtcliffe, M I, Newton
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Contact Angle Hysteresis, Adhesion, and Marine Biofouling
Langmuir, 2004Adhesive and marine biofouling release properties of coatings containing surface-oriented perfluoroalkyl groups were investigated. These coatings were prepared by cross-linking a copolymer of 1H,1H,2H,2H-heptadecafluorodecyl acrylate and acrylic acid with a copolymer of poly(2-isopropenyl-2-oxazoline) and methyl methacrylate at different molar ratios ...
Donald L, Schmidt +4 more
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Contact Angle and Contact Angle Hysteresis Measurements Using the Capillary Bridge Technique
Langmuir, 2009A new experimental technique is proposed to easily measure both advancing and receding contact angles of a liquid on a solid surface, with unprecedented accuracy. The technique is based on the analysis of the evolution of a capillary bridge formed between a liquid bath and a solid surface (which needs to be spherical) when the distance between the ...
Restagno, Frederic +4 more
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Effect of Contact Angle Hysteresis on the Measurement of Capillary Forces
Langmuir, 2007We conduct experimental investigations of macroscopic capillary forces between two flat rigid substrates characterized by their advancing and receding contact angles with water. Our results exhibit excellent agreement with theoretical predictions obtained by the numerical solution of the capillary equation.
De Souza, EJ +4 more
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Contact Angle Hysteresis on Random Surfaces
Europhysics Letters (EPL), 1987Contact angle hysteresis on weakly heterogeneous surfaces is studied using an extension of Imry and Ma's analysis of the random field problem. Deformations of the liquid-vapor interface in response to the heterogeneity are characterized by a length Ld which increases as the magnitude of the heterogeneity decreases.
M. O Robbins, J. F Joanny
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