9 March 2013 Super-hydrophobicity of PMMA and PDMS surfaces structured by femtosecond laser pulses
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Surface wettability depends on both physical surface structure and chemical material. In this report, we demonstrate super-hydrophobic surface of cast polymethyl methacrylate (PMMA) sheet by femtosecond laser fabrication. Twodimensional micro-array structures of square-typed pillars with various heights, widths, and intervals were fabricated on the PMMA surface by femtosecond laser irradiation and chemical etching. The Yb:KGW femtosecond laser processing system (λ=1030 nm) delivering 250 fs pulses at a repetition rate 100 kHz was employed for fabrication. The contact angle of PMMA changed 64° (hydrophilic plane) to 150° (super-hydrophobic structure). We also improved superhydrophobicity up to 170° contact angle by spin-coating PMMA surface with PDMS and fabricating regular microstructures including irregular nano-structures. We also coated the structured PMMA surface with a car ash spray material to use another combination of surface morphology and chemistry. All the experimental results were compared with those expected values by Cassie-Baxter model.
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Hong-Myeong Jeong, Hong-Myeong Jeong, Woon-Young Lee, Woon-Young Lee, Jin-Ho Lee, Jin-Ho Lee, Deok-Cho Yang, Deok-Cho Yang, Ki-Soo Lim, Ki-Soo Lim, "Super-hydrophobicity of PMMA and PDMS surfaces structured by femtosecond laser pulses", Proc. SPIE 8612, Micromachining and Microfabrication Process Technology XVIII, 86120M (9 March 2013); doi: 10.1117/12.2004368; https://doi.org/10.1117/12.2004368

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