Young’s angle

This is known as Young s equation where Tlg, TsG, and ysL are the surface tension between the liquid and gas, solid and gas, and solid and liquid, respectively. Young s angle is a result of thermodynamic equilibrium of the free energy at the... 

Although previous results [2] show a contact angle of 170° at an applied voltage of 0 V, the microscopic contact angle is expected to be closer to 180° (the Young s angle Oq) since the... 

Structure Young s angle if planar (Oy) Structured surface angle (6 s) Minimum reversible electrowetted angle (6y) Minimum electrowetted angle (Oy)/ voltage Extrinsic dewet method Author(s), year, (Ref.)... 

We see that the movement of the line is energetically favorable dE < 0) if the cosine of Young s angle verifies the inequality... 

We can also derive the value of B by calculating the intersection of the curves described by equations (9.3) and (9.6). This helps us to understand that the two laws must be obeyed in turn as cos 0 increases. When Young s angle is between Be and 90°, the solid remains dry ahead of the drop, and Wenzel s law describes wetting correctly. When it is between 0° and Bc a film penetrates the texture and the drop rests on a solid/liquid composite, in which case equation (9.6) is the one that describes wetting correctly. 

We will use the horizontal axis as the reference direction. If the angle of the defect is we can see immediately that the contact angle at the defect can take values betwo Young s angle 6e and tt — -h If we consider a crenellated profile ora surface with abrupt depressions (as in Figure 9.5), where the angle is equal to 7t/2, the contact angle can deviate from a... 

FIGURE 9.9. Apparent contact angle as a function of Young s angle (via their cosines) for a liquid on a textured surface. 

In this section, we consider the influence of a gravitational field on the shape of a liquid droplet residing on a solid substrate (see Fig. 8). This topic was already addressed some 100 years ago by Bashforth and Adams [29], who supplied numerical tables for the shape of the liquid droplet. Their analysis is based on two equations the Laplace equation to describe the shape of the droplet, and Young s equation to determine the contact angle. Young s angle. 

Keywords Surface Young s equation Contact angle Wetting Liquid-solid interaction Young s angle Contact angle measurement Data interpretation... 

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