Contact Angle Experiments On Self Assembled Monolayers
1178 WordsSep 20, 20165 Pages
Date of Submission
Contact Angle Experiments on Self-Assembled Monolayers
The aim of this experiment was to measure the angle between a metal surface and a liquid droplet using a CCD camera and optics. This experiment also investigated how metal surfaces coated with single-molecule layers of functionalized alkanethiols and alkanethiols alter the wetting behavior and metal surface energy.
Whenever a monolayer is attached to a metal surface, the wetting properties and behavior can be significantly affected (Yuan & Lee, 15). In practice, densely-packed self-assembled monolayers (SAMs) can be used to modify the macroscopic properties of a solid surface (Dilimon et al. 202). Changes in wetting properties occur due to changes in the angle made by a liquid droplet whenever it is in contact with the surface. This phenomenon is significant in several contexts for example, in industrial contexts: this property is used to evaluate the cleanliness of semiconductor wafers. In such contexts, contact angles measurements are widely used. Control of this property is also useful during penetration of insecticides or pesticides into plants, and waterproofing of materials (Yuan & Lee, 25). While the former focuses on maximization of wetting, the latter case seeks to minimize liquid-induced wetting (Yuan & Lee, 28). When monolayers aggregate spontaneously on a surface, they are termed as