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

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Single-Metal Hybrid Micromotor.

Dajian Li¹, Yuhong Zheng¹, Zhanxiang Zhang²

¹School of Chemistry, South China Normal University, Guangzhou, China.

Frontiers in Bioengineering and Biotechnology

|March 3, 2022

Summary

This study introduces novel hybrid micromotors that use a single metal for dual-mode propulsion. These artificial nanomachines offer efficient, fuel-free acoustic and chemical movement, enabling versatile applications.

Keywords:

catalysis group motion hybrid micromotor ultrasound

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Multimode stimuli-regulated propulsion is crucial for artificial micro-/nanomotors in diverse microscopic environments.
Developing efficient micro/nanosystems that operate in complex environments, with or without fuel, remains a significant challenge.

Purpose of the Study:

To report a novel hybrid micromotor utilizing a single metal with a unique structure (micro-spherical shell with a hole).
To demonstrate dual-mode propulsion (chemical and acoustic) and controllable group motion for artificial nanomachines.

Main Methods:

Fabrication of a single-metal micro-spherical shell with a hole.
Integration of platinum's catalytic properties for chemical propulsion in H2O2.
Design of a concave structure to enable acoustic propulsion via ultrasound in a fuel-free environment.

Main Results:

The hybrid micromotors exhibit rapid movement in H2O2-fueled environments due to Pt-H2O2 chemical reactions.
Excellent fuel-free acoustic propulsion is achieved through ultrasound-induced non-uniform stress.
Controllable group motion behaviors, including aggregation, migration, and dispersion, are realized via acoustic field regulation.

Conclusions:

The developed single-metal hybrid micromotors possess a dual driving mode and flexible propulsion regulation.
Efficient group motion regulation is achieved, making these micromotors compatible with various environments.
These advancements are expected to significantly contribute to the field of artificial nanomachines.