4D-Printed Dual-Responsive Actuator for Fast Untethered Deformation
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Solution Overview
Problem
Existing 4D-printed hydrogel materials face challenges with slow deformation speed due to hydration and dehydration processes, and limited integration of 4D deformation and controlled untethered motivation in actuators.
Innovation Solution
A bilayer structure comprising a hydrogel film and magnetic elastomer filaments embedded with magnetic particles, allowing the actuator to respond to both humidity and magnetic stimuli, achieving reversible deformations into helix structures through controlled printing patterns and magnetic field intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogel materials are used for 4D printing, then biocompatibility and softness are improved, but deformation speed deteriorates due to slow hydration and dehydration processes
Solution Approach 1:
The patent employs composite materials by integrating magnetic elastomer filaments (containing magnetic particles) with hydrogel film to create a bilayer structure. This composite design allows the hydrogel component to provide biocompatibility while the magnetic elastomer component enables faster response to magnetic field stimuli, thus resolving the contradiction between biocompatibility and deformation speed.
2Shape
If traditional 4D printing methods are used, then shape deformation capability is achieved, but integrated untethered actuation and controlled motivation are limited
Solution Approach 1:
The bilayer actuator structure is designed to perform multiple functions: the hydrogel layer provides shape deformation through humidity response, while the magnetic elastomer layer enables untethered actuation through magnetic field response. This multi-functional design allows a single integrated actuator to achieve both shape transformation and controlled motivation, resolving the limitation of traditional single-function 4D printed structures.
3Adaptability or versatility
If magnetic particles are embedded in elastomer filaments, then magnetic response capability is improved, but structural complexity increases
Solution Approach 1:
The actuator is segmented into distinct functional layers: a hydrogel film layer and a magnetic elastomer filaments layer. By segmenting the structure, each layer can be optimized independently for its specific function (hydrogel for biocompatibility and shape deformation, magnetic elastomer for magnetic response), while the overall bilayer structure remains relatively simple and manufacturable through sequential printing processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The actuator demonstrates rapid and reversible deformations, enabling remote navigation in challenging environments and untethered actuation with programmable motion modes, suitable for applications in soft robotics and biomedical devices.
Implementation Method 1
The 4D-printed hydrogel systems can be deformed to temporary shapes under the specific external stimuli. Humidity, light, heat, ions, pH and electricity are studied in the 4D printing of hydrogel materials to generate deformations.
Implementation Method 2
magnetic-driven 4D printing is being intensively investigated due to its significant advantages, such as fast response, untethered control and excellent biocompatibility. This magnetic-driven 4D printing offers a safe and effective manipulation method for biomedical applications
Data Source
AI summary
The present invention provides a 4D-printed humidity and magnetic dual responsive actuator with a bilayer structure, including a hydrogel film and a numerous of magnetic elastomer filaments, the numerous of magnetic elastomer filaments are printed on the hydrogel film to formed the bilayer structure, wherein the magnetic elastomer filaments are elastomer filaments embedded with magnetic particles, and the dual responsive actuator capable of responding to both humidity and magnetic fields, resulting in a reversible deformation that transforms into helix structures. The printed actuators can initially deform into helix structures in response to humidity stimuli and rapidly contract to a smaller size with the activation of a magnetic field. The shape deformation of this dual-responsive actuator is programmable and reversible, with stable and excellent repeatability.