ABSTRACT
Ice adhesion to surfaces is detrimental to electrical and communication cables and to air and ground transportation vehicles. Hence, anti-icing materials and mechanical and heating means have been used for de-adhesion of ice to various substrates. Alternatively, icephobic surface treatments have been developed to reduce the adhesion of ice to solid surfaces. However, the understanding of ice anti-adhesion phenomenon is lacking with respect to the effects of surface roughness and chemical composition. Consequently, the effects of roughness on the nanoscale and microscale as well as of the chemical composition of surface treatments on ice repellency were investigated. In the rst part of the study, the thermodynamics of water wettability of coated surfaces was theoretically evaluated. Accordingly, relationships were derived between the interfacial adhesion strength of a liquid drop to a polymer surface of a given composition, the mass of the drop, the measured contact angles, and the sliding angle. To verify the proposed model, various hydrophobic coatings having
4.1 Introduction ....................................................................................................68 4.2 Surface-Liquid Thermodynamics ..................................................................69 4.3 Surface Modeling ........................................................................................... 71
4.3.1 Smooth Surfaces ................................................................................. 71 4.3.2 Rough Surfaces ................................................................................... 73
4.4 Experimental .................................................................................................. 75 4.5 Results and Discussion ...................................................................................77 4.6 Conclusions ..................................................................................................... 81 References ................................................................................................................ 82
different surface nano-and microroughnesses were prepared using polycarbonate as a substrate.
