Bi-component Meta Fiber Textiles for Humidity-Responsive Infrared Emissivity
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Solution Overview
Problem
Current smart textiles fail to actively regulate thermal comfort through self-modulation of infrared radiation and emissivity in response to environmental changes, leading to inefficient energy consumption and discomfort in varying conditions.
Innovation Solution
Development of meta-cooling textiles using bi-component fibers with embedded optical nanostructures that adjust infrared emissivity based on humidity levels, achieved through a spinning process combining hydrophobic and hydrophilic polymers and heat training to modulate electromagnetic coupling between nanostructures, allowing for dynamic thermal management without external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive infrared clothing is used to absorb infrared radiation, then infrared absorption is enhanced, but the system cannot self-regulate heat transfer and requires external control
Solution Approach 1:
The bi-component meta fiber system automatically adjusts its infrared emissivity in response to environmental humidity changes without external power or control systems. The hydrophilic component absorbs moisture and changes fiber morphology, which automatically modulates the electromagnetic coupling between optical nanostructures to regulate heat transfer, enabling the system to serve itself
Solution Approach 2:
The system changes its infrared emissivity parameter dynamically in response to environmental humidity. As humidity increases, the hydrophilic polymer absorbs water, causing the fiber to transition from a coiled to an extended state, which changes the spacing between optical nanostructures and modulates electromagnetic coupling, thereby adjusting the infrared emissivity parameter to regulate heat transfer
2Reliability
If bi-component fibers with optical nanostructures are used to enable self-regulation, then thermal comfort is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention combines two polymers with antagonistic responses to humidity (one hydrophilic, one hydrophobic) into a single bi-component fiber. This composite structure allows the fiber to automatically change morphology in response to humidity, which modulates the electromagnetic coupling of embedded optical nanostructures to regulate infrared emissivity and achieve reliable thermal comfort regulation
Solution Approach 2:
The optical nanostructures are embedded within the hydrophobic polymer component of the bi-component fiber structure. This nested arrangement allows the optical nanostructures to be protected and positioned within the fiber matrix, enabling their electromagnetic coupling to be modulated by the morphology changes of the hydrophilic component without direct exposure to the environment
3Ease of manufacture
If static infrared emissivity is used in textiles, then manufacturing is simpler, but the textile cannot adapt to environmental changes
Solution Approach 1:
The textile transitions from static to dynamic infrared emissivity through the use of bi-component meta fibers that automatically change their physical state in response to environmental humidity. The hydrophilic component's moisture absorption causes reversible morphology changes that dynamically adjust the spacing between optical nanostructures, enabling the textile to adapt its infrared emissivity to environmental conditions while maintaining a relatively simple spinning-based manufacturing process
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 meta-cooling textiles effectively maintain thermal comfort by self-regulating heat transfer through infrared radiation, reducing energy consumption and enhancing wearability in diverse environmental conditions, from extreme work settings to residential use.
Implementation Method 1
modulation of the electromagnetic coupling between the optical nanostructures in the fibers resulting in self-regulation of the heat transport
Implementation Method 2
dynamic humidity responsive behavior due to an effective electromagnetic coupling of the optical nanostructures self-adjustment
Implementation Method 3
dynamic humidity responsive behavior due to an effective electromagnetic coupling of the optical nanostructures self-adjustment
Implementation Method 4
bi-morph meta fibers formed through spinning of two antagonistic polymer (hydrophobic and hydrophilic) components
Implementation Method 5
incorporates nanoparticles to enhance the absorption of infrared radiation
Implementation Method 6
enhance the absorption of infrared radiation useful inhyperthermia therapy
Data Source
Figure 1A~1F
Figure 2
Figure 3A~3B
AI summary
A bimorph meta fiber is formed through spinning of two antagonistic polymer melts, one of which contains pre-compounded optical nanostructures, into an eccentric sheath-core configuration or a side-by-side key-lock configuration. The bimorph meta fiber is capable of an adaptive regulation of the infrared radiation responsive to humidity level deviation from a comfort zone or perspiration level of the wearer of the garment fabricated from the meta fibers. The bimorph meta fibers are humidity/heat trained to attain dynamical environmentally responsive behavior to maintain the humidity/thermal comfort zone at various the humidity level fluctuations.