Results 151 to 160 of about 83,275 (200)
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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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Hysteresis of Contact Angle of Sessile Droplets
Mathematical Modelling of Natural Phenomena, 2015Summary: A theory of contact angle hysteresis 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, \(\theta\), in the range \(\theta_r < \theta
Kuchin, I., Starov, V.
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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 Hysteresis at the Nanometer Scale
Physical Review Letters, 2011Using atomic force microscopy with nonconventional carbon tips, the pinning of a liquid contact line on individual nanometric defects was studied. This mechanism is responsible for the occurrence of the contact angle hysteresis. The presence of weak defects which do not contribute to the hysteresis is evidenced for the first time. The dissipated energy
Delmas, Mathieu +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 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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Contact angle hysteresis on heterogeneous surfaces
Langmuir, 1985Considerations sur le probleme de montee capillaire sur une plaque verticale dont la surface est partiellement recouverte d'un materiau de faible energie superficielle. L'hysteresis, la difference entre les angles de contact avancant et rentrant, est associee, a l'existence de minima multiples dans la fonctionnelle de l'energie ...
Leonard W. Schwartz, Stephen Garoff
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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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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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