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

Advanced Materials
Long RenYi Du

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.

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Citations

Oct 2, 2019·Small·Lifei ZhuXuechang Zhou
Jan 29, 2019·Advanced Materials·Abdelsalam AhmedShenqiang Ren
Oct 3, 2019·Sensors·Taeyeong KimJungchul Lee
Sep 4, 2019·Lab on a Chip·Jinwon JeongDaeyoung Kim
Nov 19, 2020·Nanotechnology·Sen ChenJing Liu
Jun 18, 2021·Advanced Materials·Jing ZhangBen Zhong Tang
Feb 11, 2020·ACS Applied Materials & Interfaces·Hao ChangWei Rao
Feb 20, 2019·The Journal of Physical Chemistry. B·Sen Chen, Jing Liu
Jan 5, 2022·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Francois-Marie AlliouxKourosh Kalantar-Zadeh
Feb 5, 2022·ACS Sensors·Mahroo Baharfar, Kourosh Kalantar-Zadeh

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