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Diffusion-guided 4D microprinting of soft microactuators.

Wei-Ting Hsu¹, Po-An Tsou¹, Hsin-Jung Chou¹

¹Department of Electro-Optical Engineering, National Taipei University of Technology (Taipei Tech), Taipei, Taiwan (R.O.C.).

Nature Communications

|May 14, 2026

Summary

This summary is machine-generated.

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This study introduces a novel 4D microprinting technique for soft liquid crystal network microactuators. The method harnesses diffusion to create complex 3D structures for advanced microrobotics and biomedical applications.

Area of Science:

Materials Science
Robotics
Biomedical Engineering

Background:

Four-dimensional (4D) printing enables reconfigurable soft actuators for microrobotics and biomedical applications.
Existing methods are limited to 2D architectures and microscale limitations.
Two-photon polymerization offers high resolution but suffers from liquid crystal diffusion issues.

Purpose of the Study:

To develop a novel 4D microprinting strategy for soft liquid crystal network microactuators.
To harness liquid crystal diffusion as a design principle for complex 3D microactuator architectures.
To enable hierarchical and volumetric molecular alignment within microactuators.

Main Methods:

Utilized diffusion-guided orientation in four-dimensional (4D) microprinting.

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Last Updated: May 16, 2026

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

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Published on: January 13, 2023

Micro-masonry for 3D Additive Micromanufacturing

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Published on: August 1, 2014

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Published on: May 25, 2016

Engineered complex 3D architectures with controlled liquid crystal network alignment.

Varied laser scanning direction to program molecular orientation perpendicular to the surface profile.

Main Results:

Achieved hierarchical and volumetric alignment within complex 3D microactuator architectures.
Demonstrated diffusion-guided orientation perpendicular to the printed surface.
Successfully created microactuators with programmably aligned liquid crystal networks.

Conclusions:

The diffusion-guided 4D microprinting technique overcomes limitations of existing methods.
This approach enables the fabrication of sophisticated 3D microactuators for advanced microrobotics.
The developed microactuators can be integrated into multi-jointed microarms and microgrippers for complex actuations.