Kontaktvinkelmätning

Kontaktvinkelmätning, or contact angle measurement, is a technique used to characterize the wettability of a surface. It involves measuring the angle formed at the point of contact between a liquid and a solid surface. This angle is determined by the balance of interfacial tensions between the solid-liquid, liquid-vapor, and solid-vapor interfaces. A low contact angle, typically less than 90 degrees, indicates that the liquid spreads on the surface, signifying good wettability. Conversely, a high contact angle, greater than 90 degrees, suggests that the liquid beads up and does not spread, indicating poor wettability.

The measurement is typically performed by placing a small droplet of liquid on the solid surface and then capturing an image of the droplet profile. Specialized software analyzes the image to determine the contact angle. Factors such as surface roughness, surface chemistry, and the presence of contaminants can all influence the measured contact angle.

Kontaktvinkelmätning has diverse applications across various scientific and industrial fields. In materials science, it is used to assess surface treatments and coatings. In the pharmaceutical industry, it helps in understanding drug delivery and tablet dissolution. The printing and textile industries utilize it to optimize ink and dye adhesion. Furthermore, it plays a role in studying biological surfaces and understanding cellular interactions. The ease of performing the measurement and the rich information it provides make it a valuable tool for surface analysis.