Patent ID: 11878372
Assignee: TSINGHUA UNIVERSITY
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. A preparing method of the self-driven water collecting surface of claim 1, comprising following steps:
ablating a metal surface by a first pulsed laser to form periodically distributed peak-pit microstructures comprising alternately distributed micro-peaks and micro-pits, and to form nanostructures distributed on the peak-pit microstructures;
modifying the metal surface ablated by the first pulsed laser with a low-surface-energy substance to form the metal surface into a superhydrophobic surface;
drawing a venation channel network pattern using computer drawing software;
scanning the superhydrophobic surface by a second pulsed laser according to the venation channel network pattern to remove the low-surface-energy substance in a laser scanned region of the superhydrophobic surface without destroying the peak-pit microstructures and the nanostructures, thereby converting the laser scanned region of the superhydrophobic surface from superhydrophobic to superhydrophilic, while other regions of the superhydrophobic surface are still superhydrophobic.