4D Printed Photoactive Component for Dynamic Shape Change
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Solution Overview
Problem
Current 3D printing technologies produce static, geometrically permanent objects that are not suitable for multi-functional use, requiring multiple parts for actuation and lacking the ability to change shape dynamically.
Innovation Solution
The development of 4D printed components using photoisomerization as a stimulus for shape change, incorporating a photoactive layer with a newly synthesized linear azobenzene polymer, which can reversibly change shape upon exposure to light, reducing the need for onboard components like sensors and motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 3D printing technology is used to create objects, then objects can be manufactured with multiple materials, but the objects are static and geometrically permanent, requiring multiple parts for actuation
Solution Approach 1:
The patent combines multiple functions (structural support and shape actuation) into a single integrated component. The 4D printed object merges the support structure with the photoactive material layer, eliminating the need for separate actuators, motors, and sensors that would traditionally be required to achieve shape changing functionality.
Solution Approach 2:
The patent transforms static 3D printed objects into dynamic 4D printed objects that can change shape over time. The photoactive material enables the object to transition between different geometric states in response to light stimuli, providing adaptability and versatility without requiring multiple discrete parts.
2Ease of operation
If multiple parts are used to create motion in 3D printed objects, then actuation functionality is achieved, but onboard weight increases due to motors, sensors, and power storage
Solution Approach 1:
The patent replaces traditional mechanical actuation systems (motors, gears, linkages) with a photoresponsive material system. The photoactive material directly converts light energy into mechanical shape change through photoisomerization, eliminating the need for heavy onboard motors, power storage devices, and control electronics.
Solution Approach 2:
The 4D printed object performs self-actuation through its intrinsic photoresponsive properties. The material automatically changes shape in response to light stimuli without requiring external control systems, sensors, or power management components, thereby reducing onboard weight while maintaining actuation functionality.
3Speed
If heat or moisture is used as activation stimulus for 4D printing, then shape change is achieved, but light provides wireless control and rapid shape change
Solution Approach 1:
The patent changes the activation stimulus from thermal or moisture-based to light-based. This parameter change enables wireless control and rapid shape change response. The photoactive material absorbs light energy and undergoes rapid photoisomerization, achieving shape change on a much faster timescale compared to thermal or moisture activation methods.
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
Enables the creation of complex devices that can dynamically change shape over time, reducing part count and weight, and simplifying design, with applications in medical devices, automated actuators, and smart textiles.
Implementation Method 1
The present invention provides a 4D printed component that uses the photoisomerization stimulus as a method of activation
Implementation Method 2
The photoactive layer includes a newly synthesized linear azobenzene polymer that is printed onto several different support layers to achieve these bilayer actuators. An investigation of their optical and mechanical properties has allowed us to better understand the photomechanical behavior of these devices.
Data Source
AI summary
The present invention provides a 4D printed component that uses the photoisomerization stimulus as a method of activation. Other 4D printing methods use heat, moisture, a combination of heat and stress, and the heat from a light source as methods of activation. The present invention takes advantage of 3D printing capability and adds the capability of providing a printable material that dynamically changes shape over time when exposed to an external stimulus. The invention reduces the number of required 3D printed parts to create a moving object. This characteristic reduces the amount of onboard weight of the 3D printed components by reducing the number of parts required to create motion. The present invention removes the need for onboard sensors, processors, motors, power storage, etc. This characteristic will allow for manufacturing of, inter alia, novel medical devices, automated actuators, packaging, smart textiles, etc.