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Related Experiment Video

Updated: May 21, 2025

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

Linear magnet with fluid-solid-switchable cells for flexible devices.

Qiyu Deng¹, Hengjia Zhu¹, Zhipeng Zhao¹

¹Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR, PR China.

Nature Communications

|May 17, 2025

Summary

This summary is machine-generated.

This study presents a new hydrogel-based linear magnet for precisely controlling micro-magnets. It uses laser-heated phase-change materials to enable reorientation under mild magnetic fields, overcoming high coercivity challenges.

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Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

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Published on: August 28, 2017

Area of Science:

Materials Science
Soft Robotics
Microfluidics

Background:

Controlling micro-magnet orientation and assembly is difficult due to high coercivity.
Existing methods require high fields/temperatures, leading to low efficiency and resolution.

Purpose of the Study:

To develop a method for precise, programmable magnetic modulation at the microscale.
To overcome limitations of high coercivity in micro-magnet assembly and reorientation.

Main Methods:

Fabrication of a linear magnet using an alginate hydrogel matrix with discrete phase-change material (PCM) cells.
Incorporation of micro-magnetic particles (NdFeB) within PCM cells.
Utilizing localized laser heating to reversibly liquefy PCM, enabling particle reorientation under mild magnetic fields.

Main Results:

Demonstrated reversible switching of PCM from solid to fluid state at ~40°C.
Achieved micro-magnet reorientation under mild fields (≤30 mT) with discrete programmability (~150 µm).
The material exhibits significant stretchability (strain ~80%).

Conclusions:

The developed linear magnet offers a novel approach for space-resolved magnetic modulation.
Enables versatile applications including conformal field generation, soft robotics, flexible sensing, and interactive wearables.
Overcomes challenges associated with high coercivity in micro-magnet manipulation.