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An Additive Manufacturing Technique for the Facile and Rapid Fabrication of Hydrogel-based Micromachines with Magnetically Responsive Components
Published on: July 18, 2018
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Electrochemically Controlled Hydrogels with Electrotunable Permeability and Uniaxial Actuation.
Tobias Benselfelt1, Jyoti Shakya1, Philipp Rothemund2
1Department of Fibre and Polymer Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm, 100 44, Sweden.
Advanced Materials (Deerfield Beach, Fla.)
|July 14, 2023
Summary
Researchers developed a novel conductive hydrogel for precise electronic control of soft intelligent systems. This electrochemically controlled material enables significant shape-morphing and tunable permeability for advanced applications.
Area of Science:
- Materials Science
- Soft Robotics
- Electrochemistry
Background:
- Stimuli-responsive hydrogels offer potential for soft intelligent systems but lack precise actuation control.
- Direct electronic control of conductive hydrogels is needed for seamless integration with electronic devices.
Purpose of the Study:
- To demonstrate an electrochemically controlled nanowire composite hydrogel with high in-plane conductivity.
- To achieve precise, low-voltage, uniaxial shape-morphing and tunable permeability.
Main Methods:
- Fabrication of a nanowire composite hydrogel with high in-plane conductivity.
- Application of electrochemical stimuli (-1 V) to induce osmotic expansion.
- Characterization of shape-morphing, pressure generation, and permeability changes.
Main Results:
- Achieved up to 300% uniaxial expansion driven by capacitive charging and water molecule ingress.
- Demonstrated material state retention when power is off, enabling electrotunable membranes.
- Generated electroactive pressure up to 0.7 MPa and high work density.
Conclusions:
- The developed hydrogel system offers precise electronic control over actuation and permeability.
- This material is suitable for adaptive separation, fractionation, and distribution applications.
- Paves the way for integrating actuation, sensing, and controlled permeation in soft intelligent systems.
