Journal
NANO LETTERS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c01178
Keywords
femtosecond laser; dynamic holographic multifoci; micro-object trapping; pH-responsive hydrogels; 3D cell culture
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Funding
- National Natural Science Foundation of China [61927814, 51875544, 62005262]
- China Postdoctoral Science Foundation [2021T140649]
- Fundamental Research Funds for the Central Universities [PA2020GDSK0077]
- USTC Research Funds of the Double First-Class Initiative [YD2340002009]
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This work introduces a new method for manufacturing functional microdevices based on responsive hydrogel. By combining holograms with lens phase modulation, multiple femtosecond laser spots are generated and shifted for rapid prototyping of three-dimensional shape-morphing structures. This method, which does not require any moving equipment, offers a facile and flexible approach for fabricating high-performance microcage arrays and arrayed analytical platforms.
Functional microdevices based on responsive hydrogel show great promise in targeted delivery and biomedical analysis. Among state-of-the-art techniques for manufacturing hydrogel-based microarchitectures, femtosecond laser two-photon polymerization distinguishes itself by high designability and precision, but the point-by-point writing scheme requires mechanical apparatuses to support focus scanning. In this work, by predesigning holograms combined with lens phase modulation, multiple femtosecond laser spots are holographically generated and shifted for prototyping of three-dimensional shape-morphing structures without any moving equipment in the construction process. The microcage array is rapidly fabricated for high-performance target capturing enabled by switching environmental pH. Moreover, the built scaffolds can serve as arrayed analytical platforms for observing cell behaviors in normal or changeable living spaces or revealing the anticancer effects of loaded drugs. The proposed approach opens a new path for facile and flexible manufacturing of hydrogel-based functional microstructures with great versatility in micro-object manipulation.
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