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Magneto-Responsive Shutter for On-Demand Droplet Manipulation.

Jian Wang1, Zhengxu Zhu1, Pengfei Liu1

  • 1Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-sen University, Shenzhen, 518107, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 25, 2021
PubMed
Summary

This study introduces a novel magneto-responsive shutter (MRS) for advanced droplet manipulation. The MRS offers precise control and a large rotation range, overcoming limitations of previous magnetic actuation methods.

Keywords:
droplet transportintelligent surfaceslaser kirigamimagnetic actuationwettability

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Area of Science:

  • Materials Science
  • Microfluidics
  • Surface Science

Background:

  • Magnetically responsive surfaces are crucial for advanced droplet manipulation in scientific and engineering applications.
  • Existing magneto-responsive microarrays have limited deformation ranges and control precision, hindering droplet manipulation capabilities.
  • Current methods often rely on bending deformation of microstructures, which restricts performance.

Purpose of the Study:

  • To develop a novel magneto-responsive shutter (MRS) design for on-demand, multifunctional droplet manipulation.
  • To enable precise control and a large range of dynamic transformations (swing and rotation) for microblades.
  • To demonstrate diverse droplet manipulation functionalities using functionalized MRS surfaces.

Main Methods:

  • Designed and fabricated a novel magneto-responsive shutter (MRS) composed of arrayed microblades connected to a frame.
  • Investigated the dynamic transformation operations (swing and rotation) of the microblades under magnetic fields.
  • Developed functionalized MRSs, including Janus-MRS, superhydrophobic MRS (SHP-MRS), and lubricant-infused slippery MRS (LIS-MRS).

Main Results:

  • The developed MRS allows precise control of microblade swing and rotation over a large range (up to 3960°).
  • Functionalized MRSs demonstrated a wide array of droplet manipulations: switchable wettability, directional bounce, distribution, merging, and continuous transport.
  • The MRS design replaces conventional bending deformation with swing/rotation topographic transformation for enhanced performance.

Conclusions:

  • The novel MRS design offers a new paradigm for highly efficient and on-demand multimode droplet manipulation.
  • Precise control and large transformation range of the MRS overcome limitations of existing magnetic actuation strategies.
  • MRS technology provides a versatile platform for advanced microfluidic applications requiring complex droplet handling.