Relationship between the roughness and oleophilicity of functional surfaces

We present first approaches and results to extend our measurement and analysis methodology for hydrophobic and hydrophilic wetting systems to oleophilic surfaces. To investigate the relationship between the surface roughness and oleophilic wetting behavior, robust roughness analysis and apparent contact angle measurements for different environmental conditions are performed. Th e characterization of the roughness structures based on Power Spectral Density (PSD) functions determined from Atomic Force Microscopy (AFM) and White Light Interferometry (WLI) topography data is presented. Furthermore, our well established wetting analysis methods are applied, optimized, and extended to the specific wetting situation with oil as the liquid phase.