Wettability of Femtosecond Laser Direct Fabrication of Micro and Nanostructures on Metal Surface

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Sayed Abdul Moqim Hussaini, Mohammad Nasim Wafa

Abstract

In this article, we focused the femtosecond laser pulse on the nickel surface and scan with a pitch smaller than the size of focused beam size. After a homogeneous laser irradiation on the surface, a cylindrical two-scale micro/nano composite structure was prepared. We found that the wettability of micro-nanostructure surface does not spontaneously change from hydrophilicity to hydrophobicity in air, which is different from the result of micro/nanostructured surface prepared on steel, titanium alloy and pure coppersurfaces by femtosecond laser. The results ofthis article show that the contact angle of micro /nano structuredsurface can reach up to 148.28o after silanization near to superhydrophobicity. This discovery is of significant importancefor the selection of the base materials for the preparation of metal wettability surface bymicro/nanostructures.

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