Photothermal trap
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Solution Overview
Problem
Current methods for mitigating ice formation on surfaces, such as wind turbines and airplanes, are inefficient and environmentally unfriendly, with existing anti-icing solutions like superhydrophobic surfaces and deicing fluids facing limitations in scalability and effectiveness.
Innovation Solution
A photothermal trap system that converts electromagnetic radiation into heat using a combination of an absorber and thermal spreader, with a high absorptivity and low emissivity cermet layer on top of a thermally conductive metal layer, effectively transferring heat laterally to inhibit or induce phase changes on surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If superhydrophobic surfaces are used for anti-icing, then ice adhesion is reduced, but they fail under humid conditions due to condensation freezing and frost-induced failure
Solution Approach 1:
The patent replaces passive mechanical surface modifications (superhydrophobic surfaces) with an active photothermal heating system. The system uses light-absorbing particles embedded in a polymer matrix to convert electromagnetic radiation into heat, actively preventing ice formation through thermal energy rather than relying on surface chemistry alone.
Solution Approach 2:
The patent changes the thermal parameters of the surface by incorporating light-absorbing particles that increase the surface's absorptivity to electromagnetic radiation. This transforms the surface from a passive anti-icing coating to an active photothermal heater that can dynamically respond to environmental conditions by converting light energy into thermal energy.
2Reliability
If lubricant impregnated surfaces are used, then ice adhesion is reduced, but the lubricant depletes via cloaking, evaporation, or capillary wicking
Solution Approach 1:
The patent replaces lubricant-based passive anti-icing with photothermal active anti-icing. Instead of relying on lubricant films that deplete over time, the system uses light-absorbing particles embedded in a durable polymer matrix that converts electromagnetic radiation into heat, providing indefinite service life as long as light energy is available.
Solution Approach 2:
The photothermal system is self-powered, using ambient electromagnetic radiation (sunlight or other light sources) to generate the heat needed for anti-icing. The embedded particles continuously convert available light energy into thermal energy, eliminating the need for external power sources or consumable lubricants.
3Temperature
If plasmonic and magnetic particles are used for photothermal heating, then significant temperature increase is achieved, but scalability is limited by costs and microfabrication requirements
Solution Approach 1:
The patent uses inexpensive, commercially available light-absorbing particles (such as carbon black, iron oxide, or other common pigments) embedded in a polymer matrix, replacing expensive plasmonic nanoparticles that require complex microfabrication. The simple composite structure can be manufactured using conventional coating and molding techniques, enabling easy scaling.
Solution Approach 2:
The patent creates a composite material system combining light-absorbing particles with a polymer matrix. This composite approach allows the use of abundant, low-cost particulate materials while maintaining structural integrity and photothermal functionality, eliminating the need for expensive specialized materials and complex fabrication processes.
4Temperature
If photothermal surfaces with localized heating are used, then temperature increase is achieved at the incident light beam area, but heating is strongly localized and does not cover the entire surface
Solution Approach 1:
The patent introduces a thermally conductive polymer matrix as an intermediary medium that distributes heat laterally across the surface. The matrix acts as a heat spreader, conducting thermal energy from the locally heated particle regions to adjacent areas, thereby expanding the effective heated surface area beyond the direct light illumination zone.
Solution Approach 2:
The patent creates a heterogeneous structure where light-absorbing particles are distributed throughout the polymer matrix. This local distribution of photothermal convertors ensures that heating occurs at multiple discrete locations across the surface, and the thermal conduction through the matrix integrates these local heat sources into a broader heated region.
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 photothermal trap efficiently raises surface temperature, preventing ice formation and facilitating ice removal by creating a lubricating layer, thus enhancing energy efficiency and environmental sustainability.
Implementation Method 1
the absorber is configured to absorb electromagnetic radiation
Implementation Method 2
heat that is transferred to the thermal spreader... the heat may, in some embodiments, be transported along the lateral dimension of the article
Implementation Method 3
for the purpose of inducing or inhibiting phase change of a material disposed over a surface
Data Source
AI summary
Articles, systems, and methods in which electromagnetic energy is converted to heat (e.g., for the purpose of inducing or inhibiting phase change of a material disposed over a surface) are generally described.