3D Soft Microstructures Using Injection-Induced Self-Folding
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Solution Overview
Problem
Current manufacturing methods for soft microstructures are limited in achieving both structural and functional complexity, particularly at smaller scales, as they often result in static 2D devices due to limitations in material compatibility and resolution, restricting the design to single degree-of-freedom continuum bending structures and lacking the ability to create dynamic 3D shapes with joints and large motions.
Innovation Solution
The method involves combining multilayer soft lithography and precision layer micromachining to create elastomeric layers with embedded microfluidic circuitry, using phase-changing materials and inert working fluids to enable self-folding of 2D structures into complex 3D shapes, allowing for dynamic actuation and structural locking through injection-induced self-folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If molding techniques are used to manufacture soft microstructures, then manufacturing simplicity is improved, but structural complexity deteriorates due to mold manufacturability limitations
Solution Approach 1:
The device is divided into multiple elastomeric layers, each containing specific actuators and fluidic networks. This segmentation allows complex 3D structures to be built from simpler 2D layers that can be manufactured using standard molding techniques, then assembled together to achieve the desired structural complexity.
Solution Approach 2:
The invention transitions from traditional 2D planar manufacturing to 3D structures by stacking multiple elastomeric layers. Each layer is manufactured using standard 2D molding techniques, but their vertical assembly creates complex 3D geometries, effectively adding a dimensional aspect to overcome mold complexity limitations.
2Adaptability or versatility
If 3D printing is used to create arbitrary geometries, then geometric flexibility is improved, but manufacturing precision deteriorates due to limited resolution
Solution Approach 1:
By dividing the structure into multiple layers manufactured with high-precision molding techniques, the invention achieves fine feature resolution in each layer. The segmentation allows standard manufacturing processes to maintain precision while the stacked assembly provides geometric flexibility through varied layer configurations.
Solution Approach 2:
The invention uses molding techniques to create precise copies of actuator and fluidic network patterns in each elastomeric layer. This copying approach ensures consistent, high-resolution features are replicated across multiple layers, maintaining manufacturing precision while building complex 3D geometries through layer stacking.
3Manufacturing precision
If soft lithography is used to fabricate soft devices, then manufacturing precision is improved, but device complexity deteriorates due to two-dimensional limitation
Solution Approach 1:
The invention overcomes the 2D limitation of soft lithography by stacking multiple elastomeric layers in the vertical dimension. Each layer maintains the high manufacturing precision and fine feature density characteristic of soft lithography, while the 3D assembly of layers creates complex structures with joints and large motions that were unattainable in purely 2D devices.
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
This approach enables the creation of soft microstructures with increased structural and functional complexity, enabling dynamic 3D shapes and multiscale features, overcoming the limitations of existing methods by allowing for the integration of complex microfluidic circuits and stimuli-responsive structures.
Implementation Method 1
The structural actuator is configured to accept a phase-changing material to convert the structural actuator into a permanent structural element by self-folding a portion of the microstructure to form a three dimensional structure from a two dimensional structure
Implementation Method 2
the phase-changing material is a curable material that is configured to cause self-folding into a three dimensional structure as the curable material cures. In some embodiments, the phase-changing material is a functional material such that the three dimensional structure is responsive to a stimuli. For example, the stimuli can be ultraviolet light such that the phase-changing material is cured with the UV light
Implementation Method 3
the stimuli can be thermal energy such that the phase-changing material is cured with the thermal energy
Data Source
AI summary
Systems and methods for fabricating 3D soft microstructures. The system comprises injecting a pressurized, curable liquid into certain structural layers induces folding and allows the 2D structures to reconfigure into a 3D form In addition to the injection of a curable liquid that permanently reconfigures the structure of the system, in an embodiment this method also allows for the injection of other liquids into certain actuator layers that enable motion in certain portions of the system Furthermore, the system allows for handling of colored fluids that are passed to visualization layers. The method of creating such a system depends on taking advantage of laser machining of the individual layers to influence the behavior of how different portions bend and move.