What does a Zisman plot tell you?

What does a Zisman plot tell you?

Modern Day Zisman Plot Variation To determine how well a liquid wets a solid surface is proportional to the contact angle from the liquid while on the solid. In this variation the X-intercept gives the critical surface tension of the liquid needed to effectively wet the solid surface.

How do you determine critical surface tension from a Zisman plot?

In a Zisman investigation, the cosine of the contact angle θ is plotted against the surface tension of the appropriate liquid. The value of the surface tension extrapolated to cos θ = 1 (contact angle = 0°) is referred to as the critical surface tension σkrit.

How do you find the critical surface tension?

Background. The surface tension of different liquids is plotted against the cosine of the contact angle θ in order to determine the critical surface tension. The value of the surface tension from the regression equation for cos θ = 1 (contact angle = 0°) corresponds to the critical surface tension.

How do you find the surface tension of a contact angle?

This is known as the critical surface tension. Contact angle on the surface (in the form cosθ) for a series of liquids is plotted against surface tension. This is then extrapolated to find the surface tension for cosθ = 1, where θ = 0°, and surface tension is equal to surface energy of the solid.

What do you expect to see if the liquid surface tension is less than or equal to the critical surface tension of a surface?

A liquid with a surface tension less than or equal to the critical surface tension of a particular material will “wet” that surface, i.e. the contact angle will be less than or equal to 90o.

What is contact angle and wettability?

When an interface exists between a liquid and a solid, the angle between the surface of the liquid and the outline of the contact surface is described as the contact angle θ (lower case theta). The contact angle (wetting angle) is a measure of the wettability of a solid by a liquid.

What is critical surface tension discuss in details?

Critical Surface Tension. The critical surface tension of a solid surface is an indication of its relative water-hating or water-loving character. A low critical surface tension means that the surface has a low energy per unit area. The quantity is based on experiments with a series of pure liquids.

Why is critical surface tension important?

The critical surface tension of a solid surface is an indication of its relative water-hating or water-loving character. A low critical surface tension means that the surface has a low energy per unit area.

What is the relation between surface tension and angle of contact?

The contact angle is a measure of the ability of a liquid to wet the surface of a solid. The shape that a drop takes on a surface depends on the surface tension of the fluid and the nature of the surface. At the boundary between droplets and the gaseous environment, the surface tension causes a curved contour.

What is relation between surface tension and surface energy?

So, surface tension of a liquid is equal to the work done in increasing the surface area of its free surface by one unit. In other words, surface tension is equal to surface energy per unit area.

How does the surface tension of water compare to the surface tension of other liquids?

How does the surface tension of water compare with the surface tensions of most other liquids? It is higher.