Micromachining of polyurea aerogel using femtosecond laser pulses
| Autor: | Shouyuan Chen, Zenghu Chang, Qiumei Bian, Shuting Lei, Hongbing Lu, Byung Tai Kim, Nicholas Leventis |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
business.industry Scanning electron microscope Condensed Matter Physics Laser Fluence Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound Surface micromachining Optics Optical microscope chemistry law Femtosecond Materials Chemistry Ceramics and Composites Sapphire business Polyurea |
| Zdroj: | Journal of Non-Crystalline Solids. 357:186-193 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2010.09.037 |
| Popis: | We successfully sliced cylindrical polyurea aerogel samples of 10–15 mm in diameter into 1–3 mm disks using femtosecond laser. The experiments were performed using a Ti:sapphire laser with 800 nm wavelength in ambient air with a pulse duration of ~ 40 fs. We found that the laser fluence to breakdown this material is 1.3 J/cm 2 . The ablation rate at different energy levels was evaluated. The factors influencing the ablation surface quality were investigated. The proper fluence to slice the porous polyurea is 6.4– 8.9 J/cm 2 with the beam linearly scanning the sample at a speed of 0.1 mm/s, or 5.1–7.6 J/cm 2 with the beam circularly scanning the sample at a speed of 3.5–4°/s, and high quality machining surface was obtained under these conditions. The material removal mechanisms are proposed. Structural details of the machined area were characterized using a number of techniques such as optical microscopy and scanning electron microscopy. This work provides insights for micromachining nanostructured porous polymers using femtosecond lasers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect