FTMC - Center for Physical Sciences and Technology
The ability to change the surface properties of the material such as wettability, by laser surface structuring, is an area of considerable interest. When trying to design new functional surfaces, often the efforts are directed to replication of the natural structures such as sharkskin, lotus leaf, rose petal, etc. The unique properties of such structures are determined by their hierarchical nature: they are composed of the large period (tens of µm to several µm) and small period (hundreds of nm order) periodic or partially periodic substructures. The larger component of such structure can be fabricated using a focused laser beam and the smaller component can be obtained due to self-organized ripples on the material surface, also denoted as laser-induced periodic surface structures (LIPSS). One of the ways to provide large laser processing throughput is to use parallel processing methods such as interference lithography or, alternatively, patterning using a beam array. In this work, we present wetting properties control results of polished 1.4301 steel surface using an array of 64 beams (8 × 8) and high pulse energy ultrashort laser. Two different laser beam scanning strategies: mesh and dot, were used to get regular or semi-regular structures consisting of crossed grooves and dimples respectively. The structure period was varied from the value of the period of the beam array down to 10 times smaller value by making a certain number of additional sub-period scans. On top of these structures, various LIPSS structures were formed in the same fabrication step. Investigation of the contact angle (CA) between the water droplet and textured surface revealed that a broad range of wetting states from superhydrophilic (CA < 10°) to superhydrophobic (CA > 150°) can be achieved using such patterning approaches.
Abstract
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Poster
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