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The Electrical Double Layer

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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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Related Experiment Video

Updated: Mar 7, 2026

Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment

Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment

Published on: July 22, 2022

Electrowetting without external voltage using paint-on electrodes.

Collin B Eaker¹, Ishan D Joshipura¹, Logan R Maxwell¹

¹Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA. mddickey@ncsu.edu.

|February 23, 2017

Summary

This summary is machine-generated.

A novel paint-on liquid-metal electrode simplifies electrowetting fabrication, enabling low voltages and self-healing. This breakthrough allows electrowetting on diverse surfaces without external power, expanding its applications.

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Area of Science:

Materials Science
Microfluidics
Surface Science

Background:

Electrowetting (EW) manipulates fluids using voltage, crucial for lab-on-a-chip and optical devices.
Conventional EW requires dielectrics to prevent electrochemical reactions, increasing complexity and operating voltage.
Existing methods face challenges with substrate compatibility and fabrication complexity.

Purpose of the Study:

To introduce a simplified fabrication method for electrowetting electrodes.
To enable low-voltage operation and self-healing capabilities in electrowetting devices.
To expand the application range of electrowetting to new substrates and configurations.

Main Methods:

Development of a self-oxidizing, paint-on liquid-metal electrode.
Fabrication of electrodes on various substrates (rigid, rough, elastic) in minutes.
Utilizing the 'potential of zero charge' for electrowetting via short-circuiting.

Main Results:

Dramatically reduced electrode and dielectric fabrication complexity.
Achieved low operating voltages (<1 V) and self-healing upon dielectric breakdown.
Demonstrated electrowetting on stretchable substrates and with soft/injectable electrodes.

Conclusions:

The novel liquid-metal electrode method significantly simplifies electrowetting fabrication.
This approach enables low-voltage, self-healing electrowetting and broadens application possibilities.
Electrowetting can now be achieved without external power supplies, opening new avenues for microfluidic and optical devices.