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Van de Graaff Generator

Van de Graaff Generator

Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...

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Related Experiment Video

Updated: Feb 22, 2026

Fabrication and Characterization of a Conformal Skin-like Electronic System for Quantitative, Cutaneous Wound Management

Fabrication and Characterization of a Conformal Skin-like Electronic System for Quantitative, Cutaneous Wound Management

Published on: September 2, 2015

Scalable Hygroscopic Moisture-Electric Generator With Long-Term Stability for Self-Powered Wound-Healing Stimulation.

Yujang Cho¹, Seongcheol Ahn¹, Yeji Han¹

¹Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)

|February 21, 2026

Summary

This study introduces a hygroscopic moisture-electric generator (HMEG) for sustainable power. The device offers long-term, self-sustained energy generation from ambient moisture and demonstrates potential in regenerative bioelectronics.

Keywords:

asymmetric architecture hygroscopic nanocomposite moisture‐electric generator (MEG)self‐powered bioelectronic stimulation wound‐healing application

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Last Updated: Feb 22, 2026

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Area of Science:

Sustainable energy solutions
Bioelectronics
Materials science

Background:

Increasing demand for continuous power sources drives interest in ambient energy harvesting.
Existing technologies face limitations in diverse environmental conditions.
Hygroscopic materials offer potential for self-sustained energy generation.

Purpose of the Study:

To develop a long-term, self-sustained power generation device using hygroscopic materials.
To investigate the performance and scalability of a moisture-electric generator (HMEG).
To explore the application of HMEG-generated electricity in regenerative bioelectronics.

Main Methods:

Fabrication of an asymmetric hygroscopic moisture-electric generator (HMEG) using montmorillonite and calcium chloride.
Integration of hygroscopic materials within a perforated coin-cell structure for directional moisture transport.
Characterization of the HMEG's electrical output (voltage, current, power density) under varying humidity and scalability tests.
In vitro electrical stimulation of L929 fibroblast cells using HMEG-generated electricity.

Main Results:

The HMEG achieved stable power generation (0.55 V, 74 µA) for 30 days at 50% relative humidity.
Maximum power density reached 3.582 µW cm⁻² with demonstrated scalability in large-area devices and modular arrays.
In vitro cell stimulation enhanced wound-healing behaviors, with significant increases in cell-covered area and metabolic activity.
The device proved durable and biocompatible, linking moisture-driven energy harvesting with regenerative bioelectronics.

Conclusions:

The developed HMEG provides a sustainable and self-sustained power source from ambient moisture.
The device exhibits excellent scalability and modularity for practical energy harvesting applications.
HMEG technology shows promise for regenerative bioelectronics, particularly in enhancing cellular functions for wound healing.