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Updated: Feb 17, 2026

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

Surface Molding of Microscale Hydrogels with Microactuation Functionality.

John J Bowen¹, Mark A Rose¹, Abhiteja Konda¹

¹Department of Chemistry, University of Nebraska- Lincoln, Lincoln, NE, 68588, USA.

Angewandte Chemie (International Ed. in English)

|December 14, 2017

Summary

This summary is machine-generated.

Researchers developed "surface molding" to create diverse hydrogel microstructures (μ-gels) with tunable shapes. This technique enables the fabrication of stimuli-responsive microactuators with programmed motions for advanced applications.

Keywords:

hydrogels microactuation polymers self-assembly soft lithography

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Area of Science:

Materials Science
Polymer Chemistry
Microfabrication

Background:

Hydrogel microstructures offer unique properties for microactuation.
Existing fabrication methods can be limited in versatility and scale.
Controlling microstructure geometry is crucial for functional applications.

Purpose of the Study:

To introduce and demonstrate a novel fabrication method for hydrogel microstructures called "surface molding."
To explore the tunability of microstructure geometry and properties through controlled strain during crosslinking.
To showcase the potential of these microstructures in creating stimuli-responsive microactuators.

Main Methods:

Utilized chemically patterned elastomeric substrates to guide liquid prepolymer microdroplets.
Employed photo-initiated crosslinking to solidify microdroplets into desired morphologies.
Manipulated the strain applied to substrates during crosslinking to achieve a range of structures from a single pattern.

Main Results:

Successfully fabricated numerous hydrogel microstructures (μ-gels) with controlled geometries.
Demonstrated that adjusting strain during crosslinking allows for continuous variation in microstructure shape.
Created arrays of μ-gels exhibiting stimuli-responsive properties suitable for microactuation.

Conclusions:

"Surface molding" is a powerful soft-lithography technique for fabricating diverse microstructures.
This method enables the rational design of microactuators with programmed motions.
The technique facilitates the simultaneous synthesis of large numbers of geometrically and functionally distinct microstructures.