| 초록 |
Drag reduction has become an important issue in recent years because of energy conservation. Among diverse approaches for drag reduction, superhydrophobic surfaces have been researched due to their high drag reducing efficiency which comes from their surface characteristic: frictionless to the water. However, due to limited lifetime of air pockets on superhydrophobic surfaces in underwater, the instability of dewetted surfaces has been a sticking point for practical applications. This work presents a breakthrough in improving the underwater stability of superhydrophobic surfaces by optimizing nanoscale surface structures using SiC/Si interlocked structures. These structures have an unequaled stability of underwater superhydrophobicity and enhance drag reduction capabilities,with a lifetime of plastron over 18 days and maximum velocity reduction ratio of 56%. Furthermore, through photoelectrochemical water splitting on a hierarchical SiC/Si nanostructure surface, the limited lifetime problem of air pockets was overcome by refilling the escaping gas layer, which also provides continuous drag reduction effects. |
