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femtosecond laser shockwave peening ablation in liquids for hierarchical micro/nanostructuring of brittle silicon and its biological application

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International Journal of Extreme Manufacturing 2020年第4期2卷 29-47页

作者： Dongshi Zhang Liang-Chun Wu Masashi Ueki Yoshihiro Ito Koji Sugioka RIKEN Center for Advanced Photonics WakoSaitama 351-0198Japan Nano Medical Engineering Laboratory RIKEN Cluster for Pioneering Research2-1 HirosawaWakoSaitama 351-0193Japan Department of Chemical Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of TechnologyTokyoJapan Emergent Bioengineering Materials Research Team RIKEN Center for Emergent Matter Science2-1 HirosawaWakoSaitama 351-0198Japan

This paper presents a new technique,termed femtosecond laser shock peening ablation in liquids(fs-LSPAL),which can realize simultaneous crack micro/nanomanufacturing and hierarchical micro/nanolaser ablation,giving rise to the formation of diverse multiscale hierarchical structures,such as macroporous ratcheted structures and enéchelon microfringes decorated with parabolic *** analysis of surface morphologies,many phenomena have been confirmed to take place during fs-LSPAL,including enéchelon cracks,nanostriation,ripple densification,crack branching,and selective formation of high spatial frequency laser-induced periodic surface structures of 100–200 nm in *** a high laser power of 700 mW,fs-LSPAL at scanning speeds of 0.2 mm s^-1 and 1 mm s^-1 enables the generation of height-fluctuated and height-homogeneous hierarchical structures,*** height-fluctuated structures can be used to induce‘colony’aggregates of embryonic EB3 stem *** 200 mW,fs-LSPAL at 1 mm s^-1 is capable of producing homogeneous tilt macroporous structures with cracked structures interleaved among them,which are the synergistic effects of bubble-induced light refraction/reflection ablation and *** shown in this paper,the conventional laser ablation technique integrated with its self-driven unconventional cracking under extreme conditions expands the horizons of extreme manufacturing and offers more opportunities for complex surface structuring,which can potentially be used for biological applications.

关键词： femtosecond laser shock peening ablation shockwaves macroporous enéchelon crack striations brittle materials stem cell culture

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