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Remote, selective, and in situ manipulation of liquid droplets on a femtosecond laser-structured superhydrophobic shape-memory polymer by near-infrared light

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Abstract

Droplet manipulation plays a significant role in the fields of biomedical detection, microfluidics, and chemical engineering. However, it still remains a great challenge to simultaneously achieve remote, selective, and in situ droplet manipulation on the same surface. Here, Fe3O4 nanoparticles were doped in a shape-memory polymer (SMP) to prepare a photothermal-responsive Fe3O4-SMP composite which showed remarkable near-infrared (NIR) light-triggered shape-memory property. Superhydrophobic micropillar array was constructed on such Fe3O4-SMP composite through femtosecond laser microfabrication and fluoroalkylsilane modification. The surface wettability of the as-prepared surface can transform from a low-adhesive sliding state to a high-adhesive pinning state as the micropillars are deformed by pressing. Interestingly, the deformed micropillars can stand up and restore to their original morphology under remote NIR light irradiation, resulting in the reversible and repeatable recovery of the ultralow-adhesive superhydrophobicity. With such light-triggered wettability switching, the droplets pinning on the sample surface can be remotely, selectively, and in situ released. Furthermore, the superhydrophobic Fe3O4-SMP surface is successfully applied in lossless liquid transfer, selective droplet release, and droplet-based microreactor. The as-fabricated superhydrophobic surfaces with NIR light-controlled reversible wettability will hold great promise in the fields of liquid manipulation, lab-on-a-chip, and microfluidics.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2017YFB1104700), the National Natural Science Foundation of China (61875158), the International Joint Research Laboratory for Micro/Nano Manufacturing and Measurement Technologies, the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. State Key Laboratory for Manufacturing System Engineering and Shaanxi Key Laboratory of Photonics Technology for Information, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Xue Bai, Jiale Yong, Chao Shan, Yao Fang, Xun Hou & Feng Chen

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  1. Xue Bai
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  2. Jiale Yong
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  3. Chao Shan
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  4. Yao Fang
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  5. Xun Hou
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  6. Feng Chen
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Correspondence to Feng Chen.

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Conflict of interest The authors declare no conflict of interest.

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Bai, X., Yong, J., Shan, C. et al. Remote, selective, and in situ manipulation of liquid droplets on a femtosecond laser-structured superhydrophobic shape-memory polymer by near-infrared light. Sci. China Chem. 64, 861–872 (2021). https://doi.org/10.1007/s11426-020-9940-6

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