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Wetting ridge assisted programmed magnetic actuation of droplets on ferrofluid-infused surface

Author

Listed:
  • Jianqiang Zhang

    (City University of Hong Kong)

  • Xuejiao Wang

    (City University of Hong Kong)

  • Zhaoyue Wang

    (City University of Hong Kong)

  • Shangfa Pan

    (Chinese Academy of Sciences)

  • Bo Yi

    (City University of Hong Kong)

  • Liqing Ai

    (City University of Hong Kong)

  • Jun Gao

    (Chinese Academy of Sciences)

  • Frieder Mugele

    (University of Twente)

  • Xi Yao

    (City University of Hong Kong
    City University of Hong Kong)

Abstract

Flexible actuation of droplets is crucial for biomedical and industrial applications. Hence, various approaches using optical, electrical, and magnetic forces have been exploited to actuate droplets. For broad applicability, an ideal approach should be programmable and be able to actuate droplets of arbitrary size and composition. Here we present an “additive-free” magnetic actuation method to programmably manipulate droplets of water, organic, and biological fluids of arbitrary composition, as well as solid samples, on a ferrofluid-infused porous surface. We specifically exploit the spontaneously formed ferrofluid wetting ridges to actuate droplets using spatially varying magnetic fields. We demonstrate programmed processing and analysis of biological samples in individual drops as well as the collective actuation of large ensembles of micrometer-sized droplets. Such model respiratory droplets can be accumulated for improved quantitative and sensitive bioanalysis - an otherwise prohibitively difficult task that may be useful in tracking coronavirus.

Suggested Citation

  • Jianqiang Zhang & Xuejiao Wang & Zhaoyue Wang & Shangfa Pan & Bo Yi & Liqing Ai & Jun Gao & Frieder Mugele & Xi Yao, 2021. "Wetting ridge assisted programmed magnetic actuation of droplets on ferrofluid-infused surface," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27503-1
    DOI: 10.1038/s41467-021-27503-1
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    References listed on IDEAS

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    1. Gibum Kwon & Divya Panchanathan & Seyed Reza Mahmoudi & Mohammed A. Gondal & Gareth H. McKinley & Kripa K. Varanasi, 2017. "Visible light guided manipulation of liquid wettability on photoresponsive surfaces," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
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    Cited by:

    1. Haobo Xu & Yimin Zhou & Dan Daniel & Joshua Herzog & Xiaoguang Wang & Volker Sick & Solomon Adera, 2023. "Droplet attraction and coalescence mechanism on textured oil-impregnated surfaces," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Shaojun Jiang & Bo Li & Jun Zhao & Dong Wu & Yiyuan Zhang & Zhipeng Zhao & Yiyuan Zhang & Hao Yu & Kexiang Shao & Cong Zhang & Rui Li & Chao Chen & Zuojun Shen & Jie Hu & Bin Dong & Ling Zhu & Jiawen , 2023. "Magnetic Janus origami robot for cross-scale droplet omni-manipulation," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    3. Agustin D. Pizarro & Claudio L. A. Berli & Galo J. A. A. Soler-Illia & Martín G. Bellino, 2022. "Droplets in underlying chemical communication recreate cell interaction behaviors," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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