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Related Experiment Video

Updated: Jun 1, 2025

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Published on: April 16, 2018

Bioinspired hydrophobic pseudo-hydrogel for programmable shape-morphing.

Zhigang Wang¹, Haotian Hu², Zefan Chai¹

¹Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, China.

Nature Communications

|January 20, 2025

Summary

This summary is machine-generated.

Researchers created a novel hydrophobic pseudo-hydrogel inspired by Sphagnum moss. This material unexpectedly expands when absorbing water, enabling programmable shape changes and soft robot applications.

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Published on: February 27, 2016

Area of Science:

Materials Science
Soft Robotics
Biomimicry

Background:

Hydrogels are known for water absorption and volume expansion.
Hydrophobic materials typically repel water, limiting their use in aqueous environments.
Sphagnum moss exhibits counterintuitive water absorption despite its hydrophobic nature.

Purpose of the Study:

To develop a hydrophobic material with water-induced volume expansion capabilities.
To investigate the mechanism of absorption-induced expansion in hydrophobic matrices.
To engineer soft robots using this novel material.

Main Methods:

Preparation of a hydrophobic pseudo-hydrogel (HPH) from silicone elastomer with a porous structure.
Application of a theoretical framework analyzing elastocapillarity and surface tension effects.
Programming pore structure to control expansion behavior.
Incorporation of magnetic particles for robotic applications.

Main Results:

Demonstrated unexpected absorption-induced volume expansion in a hydrophobic matrix.
Achieved tunable, anisotropic, and programmable expansion through pore structure engineering.
Engineered HPH-based soft robots capable of locomotion (swimming, rolling, walking).
Established a theoretical understanding of surface tension-induced elastocapillarity in HPH.

Conclusions:

A novel approach to achieve water-responsive behavior in hydrophobic materials was presented.
The developed HPH material offers programmable shape-morphing capabilities.
This work expands the potential for soft robotic applications using water-responsive hydrophobic materials.