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Bio-inspired water repellent surfaces produced by ultrafast laser structuring of silicon |
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| Authors: | M Barberoglou V Zorba E Stratakis E Spanakis P Tzanetakis SH Anastasiadis C Fotakis |
| Institution: | a Institute of Electronic Structure and Laser, Foundation for Research & Technology—Hellas (IESL-FORTH), P.O. Box 1527, Heraklion 711 10, Greece b Physics Department, University of Crete, Heraklion 714 09, Greece c Materials Science and Technology Department, University of Crete, Heraklion 710 03, Greece d Technological Educational Institute of Crete, Heraklion 71004, Greece e Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece |
| Abstract: | We report here an efficient method for preparing stable superhydrophobic and highly water repellent surfaces by irradiating silicon wafers with femtosecond laser pulses and subsequently coating them with chloroalkylsilane monolayers. By varying the laser pulse fluence on the surface one can successfully control its wetting properties via a systematic and reproducible variation of roughness at micro- and nano-scale, which mimics the topology of natural superhydrophobic surfaces. The self-cleaning and water repellent properties of these artificial surfaces are investigated. It is found that the processed surfaces are among the most water repellent surfaces ever reported. These results may pave the way for the implementation of laser surface microstructuring techniques for the fabrication of superhydrophobic and self-cleaning surfaces in different kinds of materials as well. |
| Keywords: | Laser ablation Silicon Superhydrophobicity Water repellence |
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