SURFACE TENSION, CONTACT ANGLE AND WETTABILITY OF WOOD

Abstract

Surface tension is an internal force, due to an unbalance in molecular forces that occurs when two different materials such as wood surface and adhesive are brought into contact with each other forming an interface or boundary. The force is due to the tendency for all materials to reduce their surface area in response to the unbalance in molecular forces that occurs at their points of contact. Wetting properties between solids and liquids are of major importance for the most of industrial products and processes such as adhesives, paint and lacquers, photograph films, printing inks, finishing and textile. Contact angle analysis is a widely used method to study the wetting characteristics of solid materials. There are several methods to determine the contact angles of a liquid on wood surface. However, the most widely applied method is the sessile drop method.

Keywords

• Wettability
• Surface Free Energy
• Contact Angle
• Hydrophobicity
• Hydrophilicity

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