期刊
JOURNAL OF LASER APPLICATIONS
卷 27, 期 -, 页码 -出版社
AMER INST PHYSICS
DOI: 10.2351/1.4906477
关键词
picosecond laser; wettability conversion; copper; surface chemistry
资金
- National Natural Science Foundation of China [51210009]
- National Key Basic Research and Development Program of China [2011CB013000]
The wettability of metal oxides is vital to many applications including water erosion, filtration, and bioimplantation. In this work, the authors studied the wettability conversion behavior of picosecond laser structured copper surfaces in different atmospheres. The copper surfaces showed hydrophilicity initially after being irradiated by a picosecond laser. However, when they were stored in ambient air, their contact angles increased over time and became highly hydrophobic finally. The storage atmosphere influenced this process greatly, the atmosphere rich in CO2 or O-2 would restrain the wettability transition, but the organic-rich and vacuum atmosphere would accelerate it. Detailed surface chemical analysis revealed that the adsorption of organic matters from the air played an important role in this wettability conversion process. (C) 2015 Laser Institute of America.
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