Mimicking lizard-like surface structures upon ultrashort laser pulse irradiation of inorganic materials
| Autor: | Emmanuel Stratakis, Evangelos Skoulas, Philipp Comanns, Holger Mescheder, Alexandros Mimidis, Sabrina V. Kirner, Jörn Bonse, U. Hermens, Kai Winands, Jörg Krüger, C. Emonts |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
femtosecond laser ablation Scanning electron microscope General Physics and Astronomy 02 engineering and technology 01 natural sciences Fluence law.invention Lasermaterialbearbeitung surface wetting Optics Dimple law 0103 physical sciences laser-induced periodic surface structures fluid transport steel 010302 applied physics Fertigungstechnik business.industry Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Laser Fluid transport Surfaces Coatings and Films Wetting lizard 0210 nano-technology business Science technology and society |
| Zdroj: | Applied Surface Science |
| ISSN: | 0169-4332 |
| Popis: | Inorganic materials, such as steel, were functionalized by ultrashort laser pulse irradiation (fs- to ps- range) to modify the surfaces wetting behavior. The laser processing was performed by scanning the laser beam across the surface of initially polished flat sample material. A systematic experimental study of the laser processing parameters (peak fluence, scan velocity, line overlap) allowed the identification of different regimes associated with characteristic surface morphologies (laser-induced periodic surface structures, grooves, spikes, etc.). Analyses of the surface using optical as well as scanning electron microscopy revealed morphologies providing the optimum similarity to the natural skin of lizards. For mimicking skin structures of moisture-harvesting lizards towards an optimization of the surface wetting behavior, additionally a two-step laser processing strategy was established for realizing hierarchical microstructures. In this approach, micrometer-scaled capillaries (step 1) were superimposed by a laser-generated regular array of small dimples (step 2). Optical focus variation imaging measurements finally disclosed the three dimensional topography of the laser processed surfaces derived from lizard skin structures. The functionality of these surfaces was analyzed in view of wetting properties. |
| Databáze: | OpenAIRE |
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