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Related Experiment Video

Updated: Jun 27, 2026

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

Published on: February 13, 2016

Rare-Earth Coordination Hydrogels Enabling Self-Powered and Self-Luminous Closed-Loop Systems.

Kunda Yao¹, Yue Shen¹, Jingtai Li²

¹School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China.

Small (Weinheim an Der Bergstrasse, Germany)

|January 12, 2026

Summary

This study presents a self-powered, luminescent hydrogel for flexible electronics. It combines energy harvesting and tunable fluorescence for self-sustained, portable display and security applications.

Keywords:

hydrogel multifunctional rare‐earth self‐power triboelectric

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An Additive Manufacturing Technique for the Facile and Rapid Fabrication of Hydrogel-based Micromachines with Magnetically Responsive Components

An Additive Manufacturing Technique for the Facile and Rapid Fabrication of Hydrogel-based Micromachines with Magnetically Responsive Components

Published on: July 18, 2018

Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Rare-earth (RE) fluorescent hydrogels are limited by external ultraviolet (UV) excitation.
This hinders their use in portable and self-sustained electronic systems.

Purpose of the Study:

To develop a multifunctional hydrogel with tunable fluorescence, ionic conductivity, and stretchability.
To create a self-powered and self-luminous hydrogel platform for integrated optoelectronic devices.

Main Methods:

Synthesized Eu/Tb-doped hydrogel via EDC/NHS-mediated grafting of terpyridine (TPY) onto polyethyleneimine (PEI) and freeze-thaw crosslinking.
Incorporated NaCl for enhanced ionic conductivity via a salting-out effect.
Integrated the hydrogel into a triboelectric nanogenerator (RE-TENG) for energy harvesting.

Main Results:

Achieved a peak power density of 0.22 W m^-2 in the RE-TENG.
Demonstrated a fully self-powered and self-luminous hydrogel platform by coupling RE-doped hydrogels with RE-TENGs.
Successfully charged capacitors and powered UV LEDs for encrypted fluorescent pattern display without external power.

Conclusions:

Established a novel paradigm for merging energy harvesting with information display.
Opened opportunities for next-generation wearable and secure optoelectronics.
The developed hydrogel platform offers a self-sustained solution for advanced display and security technologies.