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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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An oxidized liquid metal-based microfluidic platform for tunable electronic device applications.

Guangyong Li1, Mitesh Parmar, Dong-Weon Lee

  • 1MEMS and Nanotechnology Laboratory, School of Mechanical Systems Engineering, Chonnam National University, Gwangju 500757, Republic of Korea. mems@chonnam.ac.kr.

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Summary

Surface modifications enhance oxidized Galinstan movement in microfluidic channels. Techniques using paper textures with nanoparticles or acid treatments improve non-wetting, enabling liquid metal applications.

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Area of Science:

  • Materials Science
  • Microfluidics
  • Nanotechnology

Background:

  • Easy movement of oxidized Galinstan (liquid metal) in microfluidic channels is crucial for its application.
  • Non-toxic liquid metals offer alternatives to traditional materials.

Purpose of the Study:

  • To improve the non-wetting characteristics of oxidized Galinstan in polydimethylsiloxane (PDMS) microfluidic channels.
  • To demonstrate the potential of modified microfluidic channels for liquid metal applications.

Main Methods:

  • Physical surface modification: Transferring paper textures to PDMS channels and coating with nanoparticles (e.g., titanium oxide).
  • Chemical surface modification: Using inorganic acids (e.g., sulfuric acid) to create dual-scale structures on PDMS surfaces.

Main Results:

  • Physical method with titanium oxide nanoparticles achieved advancing angle of 167° and receding angle of 151°.
  • Chemical method with sulfuric acid resulted in a contact angle of 167° and low hysteresis (~14°).
  • Successful manipulation (creation, transport, separation, merging) of oxidized Galinstan droplets in modified channels.

Conclusions:

  • Surface modification techniques significantly enhance oxidized Galinstan's non-wetting properties in PDMS microfluidics.
  • Modified channels enable precise control and manipulation of liquid metal droplets.
  • These advancements pave the way for tunable capacitors and electronic filters using liquid metal-based microfluidic devices.