Test liquid

In surface technology, the test liquid plays an important role in the characterization of surfaces. A test liquid is a special liquid that is used to determine the wettability of a surface. The choice of test liquid depends on the specific properties of the surface to be examined.

Test liquids can have different surface tensions and polarities to investigate a wide range of surface interactions. Examples of test fluids are water, ethanol solutions, organic solvents and special fluids such as diiodomethane.

The wettability of a surface by a test liquid is often assessed by measuring the contact angle. The contact angle formed between the test liquid and the surface provides important information about the interaction between the liquid and the surface. A small contact angle indicates good wettability, while a large contact angle can indicate low wettability or even rejection of the liquid.

The choice of test liquid depends on the specific requirements of the application. In some cases, several test liquids are used to evaluate different aspects of surface wettability or to characterize the surface properties in a broader spectrum.

The use of test liquids in surface engineering makes it possible to obtain important information about the surface properties that are relevant for various applications. By precisely characterizing wettability, materials and surfaces can be optimized to achieve specific functionalities or avoid undesirable effects.