A Liquid-Metal-Based Magnetoactive Slurry for Stimuli-Responsive Mechanically Adaptive Electrodes

Long Ren, Shuaishuai Sun, Gilberto Casillas-Garcia, Mitchell Nancarrow, Germanas Peleckis, Mirzat Turdy, Kunrong Du, Xun Xu, Weihua Li, Lei Jiang, Shi Xue Dou, Yi Du

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Electrical communication between a biological system and outside equipment allows one to monitor and influence the state of the tissue and nervous networks. As the bridge, bioelectrodes should possess both electrical conductivity and adaptive mechanical properties matching the target soft biosystem, but this is still a big challenge. A family of liquid-metal-based magnetoactive slurries (LMMSs) formed by dispersing magnetic iron particles in a Ga-based liquid metal (LM) matrix is reported here. The mechanical properties, viscosity, and stiffness of such materials rapidly respond to the stimulus of an applied magnetic field. By varying the intensity of the magnetic field, regulation within a factor of 1000 of the Young's modulus from ≈kPa to ≈MPa, and the ability to reach GPa with more dense iron particles inside the LMMS are demonstrated. With the advantage of high conductivity of the LM matrix, the functions of the LMMS are not only limited to the soft implanted electrodes or penetrating electrodes in biosystems: the electrical response based on the LMMS electrodes can also be precisely tuned by simply regulating the applied magnetic field.

Original languageEnglish
Article number1802595
JournalAdvanced Materials
Volume30
Issue number35
DOIs
Publication statusPublished - 2018 Aug 29

Keywords

  • bioelectrodes
  • galinstan
  • liquid metals
  • magnetoactive fluids
  • mechanically adaptive materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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