The angle between a liquid–vapor interface and a solid surface
The contact angle (symbol θC) is the angle between a liquid surface and a solid surface where they meet. More specifically, it is the angle between the surface tangent on the liquid–vapor interface and the tangent on the solid–liquid interface at their intersection.
It quantifies the wettability of a solid surface by a liquid via the Young equation.
A given system of solid, liquid, and vapor at a given temperature and pressure has a unique equilibrium contact angle. However, in practice a dynamic phenomenon of contact angle hysteresis is often observed, ranging from the advancing (maximal) contact angle to the receding (minimal) contact angle.[1] The equilibrium contact is within those values, and can be calculated from them. The equilibrium contact angle reflects the relative strength of the liquid, solid, and vapour molecular interaction.
The contact angle depends upon the medium above the free surface of the liquid, and the nature of the liquid and solid in contact. It is independent of the inclination of solid to the liquid surface. It changes with surface tension and hence with the temperature and purity of the liquid.
^Shi, Z.; et al. (2018). "Dynamic contact angle hysteresis in liquid bridges". Colloids and Surfaces A: Physicochemical and Engineering Aspects. 555: 365–371. arXiv:1712.04703. doi:10.1016/j.colsurfa.2018.07.004. S2CID 51916594.
The contactangle (symbol θC) is the angle between a liquid surface and a solid surface where they meet. More specifically, it is the angle between the...
increases. Contactangle, the angle at which a liquid droplet meets at a solid surface, is another way to characterize polymer surfaces. Contactangle (θ) is...
common way to measure surface energy is through contactangle experiments. In this method, the contactangle of the surface is measured with several liquids...
needed] Contactangle is a measure of static hydrophobicity, and contactangle hysteresis and slide angle are dynamic measures. Contactangle hysteresis...
cause the drop to ball up and avoid contact with the surface. The contactangle (θ), as seen in Figure 1, is the angle at which the liquid–vapor interface...
that by placing a droplet of liquid with a known surface energy and contactangle, the surface energy of the solid substrate can be calculated. The liquid...
they measure angles by mechanical contact they are classed as mechanical protractors. The bevel protractor is used to establish and test angles to very close...
R2=r{\displaystyle \ R_{2}=r} H=1r{\displaystyle \ H={\frac {1}{r}}} Contactangle, or wetting angle, is a very important parameter in real systems where perfect...
downhill contactangle will increase and represents the advancing contactangle while the uphill side will decrease; this is the receding contactangle. The...
chemically homogeneous, and has zero contactangle hysteresis. Zero hysteresis implies the advancing and receding contactangles are equal. In other words, only...
surfaces are highly hydrophobic, i.e., extremely difficult to wet. The contactangles of a water droplet on an ultrahydrophobic material exceed 150°. This...
a counter top in kitchen or a cooking pan) can be measured by the contactangle of water droplet. A University of Nebraska-Lincoln team recently devised...
measured by its contactangle. The higher the contactangle the higher the hydrophobicity of a surface. Surfaces with a contactangle < 90° are referred...
that it is not very precise, needs regular adjustment of the dwell (contact) angle, and at higher revolutions, its mass becomes significant, leading to...
diagram on the left, these factors include the size of the droplet, the contactangle, θ{\displaystyle \theta }, between the droplet and surface, and the...
directions) and the contactangle of the bearing should be matched to the relative proportions of each. The larger the contactangle (typically in the range...
slip angle results in a force, the cornering force, which is in the plane of the contact patch and perpendicular to the intersection of the contact patch...
is complete can be assessed with contactangle measurements. When an organic contaminant is present, the contactangle of water with the device is high...
Camber angle is one of the angles made by the wheels of a vehicle; specifically, it is the angle between the vertical axis of a wheel and the vertical...
as the corrected contactangle of water, the corrected contactangle of black ink, and the total surface energy. The contactangle measurement has proven...
contactangle at the bottom θ t {\displaystyle {\theta _{t}}} is the contactangle at the top θ l {\displaystyle {\theta _{l}}} is the contactangle at...