How to measure contact angle manually

The most widely used technique of contact angle measurement is a direct mea-surement of the tangent angle at the three-phase contact point on a sessile drop profile. Bigelow et al. [37] set up a simple and convenient instrument, which they referred to as a “telescope-goniometer” to measure contact angles of various liquids on polished www.doorway.ru Size: KB. Diagram of the contact angle The angle between a liquid drop and a solid surface, Young’s contact angle, is related to the surface tensions of the three interfaces according to the relationship: cos θY = (γSolid-Vapor - γSolid-Liquid) / γLiquid-Vapor (1) The magnitude of Young’s contact angle is a result of energy minimization.  · How to use a smartphone to take contact angle measurements.

You can then calculate the contact angle using the formula: Theta(e) = pi - acos(h/R), where Theta(e) is the contact angle, h is the distance from the centre of the fitted circle to the baseline. How to use a smartphone to take contact angle measurements. Sessile drop measurement is the most commonly used contact angle measurement method. In practice, a droplet is placed on the solid surface and an image of the drop is recorded. The static contact angle is then defined by fitting Young-Laplace equation around the droplet, although other fitting methods such as circle and polynomial can also be used.

This system is established with the contact angle and surface tension measurement experiment which is based on Fox-Zisman theory. Different probe liquids were. the normal plane perpendicular to the three-phase interface, and each angle was measured both by a computer and manually to ensure measurement accuracy. The values of contact angle measured were used to calculate the SFE and its This distortion was corrected manually using the software ShiftN