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Utilizes the evolution of intrinsic grain structures of stainless steel to modify surface wettability.
About
Won Tae Choi, Laurens Victor Breedveld, Dennis W. Hess, Kkochnim Oh, and Preet M. Singh from the School of Chemical and Biomolecular Engineering at Georgia Tech have developed a novel fabrication technique to impart anti-wetting properties to stainless steel without applying a coating, while still maintaining the integrity of the mechanical and thermal stability of the material. The process is a two-step electrochemical etching process comprised of sequentially low and high anodic potentials, resulting in the evolution of intrinsic hierarchical structures that impart enhanced anti-wetting properties to the stainless steel. In the initial low potential electrochemical etch step, the SS316 is used as both the working and counter electrode. Using dilute nitric acid as the electrolyte the potentiostatic electrochemical etching is carried out at a low anodic potential to evolve intrinsic grain structures. A second step of potentiostatic etching Step is performed at high anodic potential.
Applications
This novel technique addresses the need for stainless steel with anti-wetting properties through a two-step electrochemical etching process. This technology has utility in a myriad of commercial, industrial and military applications. For example, this technique can be used to impart antifouling coatings and reduced drag on ship hulls. Similarly, reduced hydrodynamic drag in metal pipes and reaction vessels can lead to more efficient fluid transport and reduced energy consumption. Enhanced heat transfer efficiency during condensation of water vapor via drop-wise condensation can save energy in both power generation and desalination processes. Finally, in consumer goods, enhanced anti-wetting properties can be used to create appliances and fixtures that are easier to clean and keep clean.