Polymer Self-Folding Structures with Phase-Change Joints
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Solution Overview
Problem
Existing self-folding structures for microcontainers are primarily metallic, lacking biodegradability and optical transparency, which are essential for applications in cell encapsulation, tissue engineering, and drug delivery.
Innovation Solution
Development of sub-centimeter structures composed of polymers with a joint material that transitions from a rigid to a partially fluid phase, allowing the structure to self-assemble into three-dimensional configurations, enabling precise patterning of pores in all dimensions and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metallic containers are used for self-folding structures, then photolithographic patterning and wet etching are facilitated, but biodegradability and optical transparency are lost
Solution Approach 1:
The patent changes the material parameter from metallic to polymeric composition, enabling both biodegradability and optical transparency while maintaining manufacturability through photolithographic patterning. The polymer material allows remote heating via electromagnetic fields and exhibits phase change behavior for self-folding.
Solution Approach 2:
The patent employs composite material strategies by combining polymeric structural components with joint materials that undergo phase changes, creating a self-folding structure that integrates multiple functional properties including biodegradability, optical transparency, and mechanical stability.
2Use of energy by moving object
If metallic containers are used for self-folding structures, then electromagnetic field interaction for remote heating is enabled, but optical transparency is lost
Solution Approach 1:
The patent changes the material optical parameters by using polymers instead of metals, achieving optical transparency while maintaining electromagnetic field interaction capability through phase change mechanisms that enable remote heating.
3Strength
If joint material is rigid to hold structural components, then mechanical stability is achieved, but self-folding capability is lost
Solution Approach 1:
The patent applies dynamics by using joint materials that can change their mechanical properties through phase transitions. The joint material transitions from rigid to fluid phases, enabling the structure to be stable during handling yet flexible enough to self-fold when exposed to appropriate stimuli.
Solution Approach 2:
The patent exploits phase transitions of the joint material to achieve both mechanical stability and self-folding capability. The material undergoes phase change from solid (rigid) to liquid (fluid) states, allowing the structure to maintain shape during storage and then fold dynamically when triggered.
4Adaptability or versatility
If joint material is fluid to allow structural components to move, then self-folding is enabled, but structural integrity is compromised
Solution Approach 1:
The patent uses dynamic phase-changing joint materials that can switch between fluid and rigid states. The material remains fluid during self-folding to enable movement, then transitions to rigid state to restore structural integrity and maintain the folded configuration.
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 polymer-based self-folding structures provide optical transparency, enhanced diffusion, and biodegradability, facilitating effective cell encapsulation, tissue engineering, and drug delivery while maintaining mechanical stability.
Implementation Method 1
The joint includes a material that has a first phase that is substantially rigid to hold the first and second structural components in a substantially rigid configuration while the material is in the first phase. The material of the joint has a second phase such that the joint is at least partially fluid to allow the first and second structural components to move relative to each other while the material is in the second phase.
Implementation Method 2
exposing the joint to heat such that the joint changes phase from a substantially solid material to an at least partially fluid material such that the joint interacts with the first and second structural components to cause the first and second structural components to move relative to each other in a substantially predetermined motion.
Data Source
AI summary
A sub-centimeter structure includes a first structural component, a second structural component arranged proximate the first structural component, and a joint connecting the first and second structural components. The joint includes a material that has a first phase that is substantially rigid to hold the first and second structural components in a substantially rigid configuration while the material is in the first phase. The material of the joint has a second phase such that the joint is at least partially fluid to allow the first and second structural components to move relative to each other while the material is in the second phase. The joint interacts with the first and second structural components while the material is in the second phase to cause the first and second structural components to move relative to each other. And, the first and second structural components include a polymer.