Magnetically Actuated Superhydrophilic Robot Sphere Fabricated by a Femtosecond Laser for Droplet Steering

Yuchun He, Kai Yin, Lingxiao Wang, Tingni Wu, Qinwen Deng, Yapeng Dou, Christopher J. Arnusch

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Droplet steering has important applications in biomedical detection, local chemical reactions, liquid collection, and microfluidic control. Presently, droplet steering methods typically require specific paths and can be challenging to operate, involving complex fabrications for the operating systems. Here, we show a magnetically actuated superhydrophilic robot sphere (MSR) based on femtosecond laser direct writing technology for droplet steering. Through femtosecond laser treatment, uniform micro-/nanostructures are constructed on the surface of a MSR. Additionally, the contactless magnetic actuator makes it possible to remotely steer the MSR to transport droplets. After preliminary exploration of the mechanism by which MSR drives the droplet movement, the ability of MSR to control the droplet movement was systematically tested and analyzed. Moreover, the applications of the MSR in complex path liquid collection and transport, three-dimensional space transport, self-cleaning, etc., are further verified. This strategy provides a novel and reliable path for droplet manipulation and broadens its application.

Original languageEnglish
Pages (from-to)4947-4955
Number of pages9
JournalNano Letters
Issue number11
StatePublished - 14 Jun 2023


  • adhesion
  • droplet steering
  • femtosecond laser
  • magnetically actuated
  • superhydrophilic

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • Chemistry (all)
  • Materials Science (all)


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