Three-dimensional laser micro-sculpturing of silicone: towards bio-compatible scaffolds
Three-dimensional laser micro-sculpturing of silicone: towards bio-compatible scaffolds
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DOI：
10.1364/oe.21.017028
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发表时间：
2013-07-15
期刊：
影响因子：
3.8
通讯作者：
Juodkazis, Saulius
中科院分区：
文献类型：
--
作者：
Rekstyte, Sima;Malinauskas, Mangirdas;Juodkazis, Saulius
Possibility to form three-dimensional (3D) micro-structures in silicone elastomer (polydimethylsiloxane; PDMS) doped with different photo-initiators was systematically investigated using direct laser writing with femtosecond laser pulses at different exposure conditions. Accuracy of the 3D structuring with resolution of similar to 5 mu m m and a fabrication throughput of similar to 720 mu m(3)/s, which is exceeding the previously reported values by similar to 300(x), was achieved. Practical recording velocities of 1 mm/s were used in PDMS with isopropyl-9H-thioxanthen-9-one (ISO) and thioxanthen-9-one (THIO) photo-initiators which both have absorption at around 360 nm wavelength. The 3D laser fabrication in PDMS without any photo-initiator resulting in a fully bio-compatible material has been achieved for the first time. Rates of multi-photon absorption and avalanche for the structuring of silicone are revealed: the two-photon absorption is seeding the avalanche of a radical generation for subsequent cross-linking. Direct writing enables a maskless manufacturing of molds for soft-lithography and 3D components for microfluidics as well as scaffolds for grafts in biomedical applications. (C) 2013 Optical Society of America
