Results 221 to 230 of about 60,431 (253)

Microscopic studies of static and dynamic contact angles

Journal of Adhesion Science and Technology, 1993
Molecular dynamics simulations are used to test macroscopic theories for static and dynamic contact angles. Young's equation is verified by comparing observed static contact angles to angles calculated from the independently measured surface tensions between phases. Laplace's relation between the interfacial curvature and pressure is also checked. Both
Peter A. Thompson, W.B. Brinckerhoff, Mark O. Robbins   +2 more
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Static and dynamic contact angles of evaporating liquids on heated surfaces

Journal of Colloid and Interface Science, 2010
We studied both static and dynamic values of the apparent contact angle for gravity-driven flow of a volatile liquid down a heated inclined plane. The apparent contact line is modeled as the transition region between the macroscopic film and ultra-thin adsorbed film dominated by disjoining pressure effects. Four commonly used disjoining pressure models
Vladimir S, Ajaev, Tatiana, Gambaryan-Roisman, Peter, Stephan   +2 more
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Static contact angle in lattice Boltzmann models of immiscible fluids

Physical Review E, 2005
We study numerically the capillary rise between two horizontal plates and in a rectangular tube, using a lattice Boltzmann (LB) method. We derive an equation for the static fluid-solid contact angle as a function of the wetting tendency of the walls and test its validity.
M, Latva-Kokko, Daniel H, Rothman
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Static and Dynamic Contact Angles of Water on Polymeric Surfaces

Langmuir, 1997
Static contact angle and dynamic (advancing and receding) contact angles of water on polymeric surfaces were investigated using microscope cover glasses coated with various plasma polymers of trimethylsilane and oxygen. By variation of the mole fraction of the TMS/oxygen mixture, glass surfaces having varying degrees of wettability were prepared.
Masayo Miyama, Yanxia Yang, Takeshi Yasuda, Tsumuko Okuno, Hirotsugu K. Yasuda   +4 more
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Static and dynamic contact angles – A phase field modelling

The European Physical Journal Special Topics, 2009
We propose a scheme for studying static and dynamic contact angles using a phase field model. The theoretical description is based on the Navier-Stokes equation with extra phase field terms and the continuity equation. In this model free of interface conditions, the contact angle can be controlled through the boundary conditions for the density field ...
R. Borcia, I. D. Borcia, M. Bestehorn
openaire   +1 more source

Effect of Camera Parallax Angle on the Accuracy of Static Contact Angle Measurements

Langmuir
Measuring the contact angle at the solid/liquid/vapor triple point in sessile drop experiments is one of the most popular and simple ways to quantify the wettability of surfaces and determine the surface free energy. Despite decades of technical advancements in contact angle measurements, which allowed for improving the precision of sessile drop ...
Owen M. Johnson, Filippo Mangolini
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Prediction of static contact angles on the basis of molecular forces and adsorption data

Physical Review E, 2016
At a three-phase contact line, a liquid bulk phase is in contact with and coexists with a very thin layer of adsorbed molecules. This adsorbed film in the immediate vicinity of a liquid wedge modifies the balance of forces between the liquid and solid phases such that, when included in the balance of forces, a quantitative relationship emerges between ...
M Elena, Diaz, Michael D, Savage, Ramon L, Cerro   +2 more
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Research on the Prediction of Static Contact Angle in Circular Capillary Tubes

Applied Mechanics and Materials, 2012
New discovery was found by the capillary experiments with circular glass tubes and partial-wetting liquids that the partial liquid volume under moon surface could be expressed by equivalent height function H(r). Contact angle models suggested in this work, evaluated by Eq.
Jun Biao Wang, Dong Zi Zeng, Jian Jun Jiang   +2 more
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Comparison of static contact angle change and relaxation in EWOD devices

2009 Spanish Conference on Electron Devices, 2009
In conventional Electrowetting on Dielectric (EWOD) devices a static change of the contact angle is observed when a voltage is applied to the electrodes, usually correlated to the Lippmann equation. In this paper we analyze the contact angle changes by using two different dielectrics of different materials and thicknesses and also comparing two ...
Vito di Virgilio, Luis Castaner
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Fuzzy based models for estimating static contact angle and sliding angle of liquid drops

Progress in Organic Coatings, 2018
Abstract Prediction of the contact angles and sliding angles of liquid drops is so difficult, because the interaction among the variables, which have impact on the angles, is so complex. Therefore, in this paper fuzzy logic was used to develop prediction models.
Naser Valipour Motlagh, Mehran Taghipour-Gorjikolaie   +1 more
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