Results 211 to 220 of about 14,224 (261)
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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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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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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 of Microbead Suspensions
Langmuir, 2010Microbead suspensions are often used in microfluidic devices for transporting biomolecules. An experimental investigation on the wettability of microbead suspension is presented in this study. The variation in the surface tension and the equilibrium contact angle with the change in the volume fraction of the microbead is presented here.
Prashant R, Waghmare, Sushanta K, Mitra
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Hysteresis during contact angles measurement
Journal of Colloid and Interface Science, 2010A theory, based on the presence of an adsorbed film in the vicinity of the triple contact line, provides a molecular interpretation of intrinsic hysteresis during the measurement of static contact angles. Static contact angles are measured by placing a sessile drop on top of a flat solid surface.
M Elena, Diaz +3 more
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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 Solid Crystalline Surfaces
Colloid Journal, 2023The article presents the results of experimental studying the hysteresis of water contact angles at crystalline surfaces. Receding and advancing contact angles and their hysteresis at hydrophilic and hydrophobic substrates with different surface structures (silica, mica, and calcite) have been studied under the action of an external pressure applied to
N. E. ESIPOVA +2 more
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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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On the interpretation of contact angle hysteresis
Journal of Adhesion Science and Technology, 2002The determination of solid surface free energy is still an open problem. The method proposed by van Oss and coworkers gives scattered values for apolar Lifshitz-van der Waals and polar (Lewis acid-base) electron-donor and electron-acceptor components for the investigated solid. The values of the components depend on the kind of three probe liquids used
Emil Chibowski +2 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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