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Four-Dimensional Printing of Stimuli-Responsive Hydrogel-Based Soft Robots

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Photothermal-Responsive Shape-Memory Magnetic Helical Microrobots with Programmable Addressable Shape Changes.

Fu Zhao¹, Weibin Rong¹, Lefeng Wang¹

¹State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150080, China.

ACS Applied Materials & Interfaces

|May 19, 2023

Summary

This summary is machine-generated.

Researchers developed magnetic helical microrobots using shape-memory polymers. These microrobots offer precise control and targeted shape changes using near-infrared lasers, enhancing micromanipulation capabilities.

Keywords:

Fe3O4 nanoparticles helical microrobots magnetic microrobots polylactic acid shape-memory polymers

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Area of Science:

Materials Science
Robotics
Biomedical Engineering

Background:

Stimuli-responsive materials are crucial for advanced microrobot functionalities.
Existing magnetic helical microrobots often rely on bulk heating, limiting individual control.

Purpose of the Study:

To develop magnetic helical microrobots with precise, individually addressable shape-changing capabilities.
To explore near-infrared laser-induced photothermal effects for microrobot actuation.

Main Methods:

Fabrication of magnetic helical microrobots using polylactic acid and Fe3O4 nanoparticles.
Utilizing rotating magnetic fields for locomotion and near-infrared lasers for shape recovery.
Adjusting the transition temperature of shape recovery above 37 °C.

Main Results:

Microrobots exhibited controlled locomotion and programmable shape changes (length, diameter, chirality).
Near-infrared laser stimulation enabled rapid shape recovery (77% in 15s, 90% in 1 min).
Selective stimulation allowed individual microrobot control and precise deployment.

Conclusions:

The developed microrobots offer enhanced control and programmability for complex tasks.
Laser-actuated shape changes facilitate precise micromanipulation and object assembly.
These microrobots show significant potential in biomedicine and micromanipulation applications.