Results 301 to 310 of about 221,487 (372)
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Constitutive modeling of contact angle hysteresis
Journal of Colloid and Interface Science, 2008We introduce a phase field model of wetting of surfaces by sessile drops. The theory uses a two-dimensional non-conserved phase field variable to parametrize the Gibbs free energy of the three-dimensional system. Contact line tension and contact angle hysteresis arise from the gradient term in the free energy and the kinetic coefficient respectively. A
Vedantam, S., Panchagnula, M.V.
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Contact angle hysteresis on fluoropolymer surfaces
Advances in Colloid and Interface Science, 2007Contact angle hysteresis of liquids with different molecular and geometrical properties on high quality films of four fluoropolymers was studied. A number of different causes are identified for hysteresis. With n-alkanes as probe liquids, contact angle hysteresis is found to be strongly related to the configuration of polymer chains.
H, Tavana +4 more
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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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Mechanisms for contact angle hysteresis and advancing contact angles
Journal of Petroleum Science and Engineering, 1999Mixed-wet crude oil/brine/mineral systems typically show a large contact angle hysteresis between the water-receding angle during primary drainage and the water-advancing angle during imbibition. Also, the water-advancing angle may have values that range from 50° to 180°.
S.-Y Yang +3 more
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Interpretation of contact angle hysteresis
Journal of Adhesion Science and Technology, 1993Hysteresis of the contact angle, i.e. the difference between the advancing and receding contact angles, is discussed in terms of the liquid film presence behind the drop when it has receded. It is shown that values of receding contact angles in many systems result from a well-defined free energy balance in the solid/liquid drop system. If a duplex film
Emil Chibowski +1 more
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Droplet sliding: the numerical observation of multiple contact angle hysteresis.
Langmuir, 2019Droplets sliding on surfaces always exhibits an advancing and a receding contact angles. When exert different driving forces on the droplet to force it to slide at different velocities, the droplet would alter its shape to adapt to the new motion. Hence,
Yuxiang Wang +5 more
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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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Omniphobic Metal Surfaces with Low Contact Angle Hysteresis and Tilt Angles.
Langmuir, 2018Various metal (Al, Ti, Fe, Ni, and Cu) surfaces with native oxide layers were rendered "omniphobic" by a simple thermal treatment of neat liquid trimethylsiloxy-terminated polymethylhydrosiloxanes (PMHSs) with a range of different molecular weights (MWs).
Narendra Pratap Singh +6 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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