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The Electrical Double Layer

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

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Ionic Double-Network Hydrogels for Integrated Electromagnetic Shielding and Self-Powered Sensing in Wearable

Chenchen Wang¹, Yao Ding¹, Tianzhao Wu²

¹Key Laboratory of Advanced Materials for Facility Agriculture, Ministry of Agriculture and Rural Affairs, College of Materials and Energy, South China Agricultural University, No. 483 Wushan Road, Guangzhou, 510642, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|June 30, 2025

Summary

A novel ionic hydrogel offers dual protection for implantable devices, providing effective electromagnetic shielding and self-powered physiological monitoring. This material integrates biocompatibility and low cost for advanced medical electronics.

Keywords:

absorption dominance electromagnetic interference shielding ionic conductive hydrogel sensor monitoring

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Area of Science:

Materials Science
Biomedical Engineering
Electromagnetics

Background:

Cardiovascular implantable electronic devices (CIEDs) require protection from electromagnetic interference (EMI).
Integrating monitoring functions into CIEDs presents a significant challenge.
Existing solutions often lack biocompatibility or multifunctionality.

Purpose of the Study:

To develop a multifunctional material for integrated EMI shielding and self-powered physiological monitoring.
To address the dual challenges faced by CIEDs.
To create a biocompatible, low-cost alternative to traditional shielding materials.

Main Methods:

Fabrication of a double-network ionic hydrogel using sodium alginate (SA) and acrylamide (AM) with Ca²⁺ and Li⁺ ions.
Optimization of ion coordination and salt concentration for enhanced shielding.
Integration of the hydrogel into a self-powered sensor for physiological signal monitoring.

Main Results:

The optimized hydrogel achieved an EMI shielding effectiveness (SE_T) of 63.75 dB in the X-band, with >93% absorption loss.
The material demonstrated effective self-powered sensing of physiological signals (e.g., heartbeat) with high sensitivity.
The hydrogel exhibited excellent anti-interference capabilities in dynamic environments.

Conclusions:

The developed ionic hydrogel offers a promising material-device-system solution for electromagnetic protection and intelligent monitoring of CIEDs.
This approach avoids traditional conductive fillers, enhancing biocompatibility and reducing cost.
Opens new avenues for multifunctional shielding materials in implantable electronics.