| 초록 |
A convection heat treatment that can replace existing chemical oxidation methods was developed for the preparation of hierarchically oxidized Cu meshes with various surface morphologies, representing a simple and green route that does not involve toxic chemicals. Three types of Cu meshes [bumpy-like and short and long needle-like structures] exhibited similar separation efficiencies of 95−99% over 20 cycles, as indicated by their similar water contact angles (147−150°). However, these Cu meshes exhibited different flux behaviors. Excessively rough and smooth surfaces of the Cu mesh resulted in increased resistance to flow and to a decrease of the penetration of oil. A surface with intermediate smoothness, such as the BL-Cu mesh, was necessary for high flux over a broad range of oil viscosities. Furthermore, a less rough surface was more suitable for the separation of highly viscous oil. Computational fluid dynamics simulations were carried out to support our experimental results. |
