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PDF(2681 KB)
PDF(2681 KB)
用于润湿性控制的Stavax 钢基材的皮秒激光表面纹理处理
Picosecond Laser Surface Texturing of a Stavax Steel Substrate for Wettability Control
In this investigation, a picosecond laser was employed to fabricate surface textures on a Stavax steel substrate, which is a key material for mold fabrication in the manufacturing of various polymer products. Three main types of surface textures were fabricated on a Stavax steel substrate: periodic ripples, a two-scale hierarchical two-dimensional array of micro-bumps, and a micro-pits array with nano-ripples. The wettability of the laser-textured Stavax steel surface was converted from its original hydrophilicity into hydrophobicity and even super-hydrophobicity after exposure to air. The results clearly show that this super-hydrophobicity is mainly due to the surface textures. The ultrafast laser-induced catalytic effect may play a secondary role in modifying the surface chemistry so as to lower the surface energy. The laser-induced surface textures on the metal mold substrates were then replicated onto polypropylene substrates via the polymer injection molding process. The surface wettability of the molded polypropylene was found to be changed from the original hydrophilicity to super-hydrophobicity. This developed process holds the potential to improve the performance of fabricated plastic products in terms of wettability control and easy cleaning.
Picosecond laser / Surface texturing / Stavax steel / Polymer / Hydrophobicity
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The authors would like to thank Ms. Hong Xie for her help with XPS measurement. They would also like to thank the Agency for Science, Technology and Research (A*STAR) of Singapore for financial support.
Xincai Wang, Hongyu Zheng, Yinchi Wan, Wenhe Feng, and Yee Cheong Lam declare that they have no conflict of interest or financial conflicts to disclose.
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