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Bio-mimetic synthetic cell hydrogel magnetometer.

Subhashish Dolai¹, Hsuan-Yu Leu, Jules Magda

¹Electrical and Computer Engineering, University of Utah, Salt Lake City, UT, United States of America.

Bioinspiration & Biomimetics

|December 19, 2018

Summary

This study introduces a novel bio-inspired hydrogel magnetometer. It uses cell potential changes to detect magnetic fields, mimicking neuron firing at high fields.

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Area of Science:

Biomaterials Science
Sensor Technology
Neuro-inspired Engineering

Background:

Developing novel magnetic field sensors is crucial for various applications.
Hydrogels offer biocompatible platforms for advanced sensor design.
Bio-inspired approaches can lead to unique sensing mechanisms.

Purpose of the Study:

To present a novel bio-inspired hydrogel magnetometer.
To investigate the use of cell potential (V_oc) for magnetic field measurement.
To explore the sensor's behavior under different magnetic field strengths and environmental conditions.

Main Methods:

Fabrication of a hydrogel-based sensor incorporating ferromagnetic particles.
Measurement of cell potential (V_oc) changes in response to external magnetic fields.
Analysis of sensor response to varying magnetic field strengths, pressure, and temperature.

Main Results:

The hydrogel magnetometer exhibits sensitivity of ~3.7 V T^-1 to magnetic fields.
At critical fields (B_c ~38 mT), particle-induced hydrogel puncture leads to neuron-like firing behavior with higher sensitivity (~23.5 V T^-1).
The sensor's V_oc is also affected by pressure (~8 mV kPa^-1) and temperature (~2 mV K^-1), and shows fatigue-like behavior over time.

Conclusions:

The developed hydrogel magnetometer offers a unique, bio-inspired method for magnetic field sensing.
The sensor's neuron-like response at high fields presents a novel sensing regime.
The device's sensitivity to pressure and temperature, along with its fatigue and rechargeability, highlights its potential for complex environmental monitoring.