Superhydrophobic Structure Fabricated by Femtosecond Laser on Nickel Surface

Lei Zhang; Xiao Wen Cao; Ru Yi Xiang; Shun Guang Li; Lei Wang; Hui Chao Sun

doi:10.4028/www.scientific.net/AMR.1004-1005.1311

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Superhydrophobic Structure Fabricated by Femtosecond Laser on Nickel Surface

Abstract:

Fabrication of superhydrophobic structure by femtosecond laser become more and more popular in recent years, because it’s inexpensive and micro/nanostructure can be controlled compared with other methods. This paper proposes an approach to fabricate large scale superhydrophobic structure directly on nickel (Ni) surface by femtosecond laser and the apparent contact angle (CA) on the Ni surface can reach 134° without further coating any low surface energy materials. With low laser power, typical laser-induced periodic surface structures (LIPSS) at the submicron level can be observed. With high laser power, periodic ripples with microstructure covered by LIPSS can be observed. The micro/nanostructure on Ni surface is directly replicated onto PDMS and after replication the CA on PDMS surface can be improved to 153° obviously from CA of 120° on PDMS surface without micro/nanostructure. The higher laser power can results in the larger CA. This replication method can be applied for fabricating large scale superhydrophobic structure and the replication master can be used many times.