Thermochromic Window Nanofiber Coating Agglomeration
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Solution Overview
Problem
Traditional thermochromic windows suffer from agglomeration and uneven light absorption or reflection, leading to inconsistent aesthetics and reduced visibility, with existing manufacturing methods being costly, energy-intensive, and lacking control over particle size and distribution.
Innovation Solution
A thermochromic window with a vanadium oxide (VO2) nanoparticle layer embedded in an electrospun nanofiber mat, encapsulated in a refractive index-matched epoxy resin, allowing for controlled temperature-dependent infrared radiation absorption or reflection, and featuring a scalable, cost-effective manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermochromic window manufacturing methods are used, then thermochromic functionality is achieved, but particle agglomeration and uneven light absorption occur leading to inconsistent aesthetics and reduced visibility
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where VO2 nanoparticles are selectively positioned at the core of polymer fibers rather than being uniformly distributed throughout. This localized placement ensures consistent thermochromic performance while preventing agglomeration, as each fiber acts as an isolated carrier for a controlled number of nanoparticles.
Solution Approach 2:
The patent segments the thermochromic coating into discrete electrospun fibers rather than using a continuous particle dispersion. Each fiber is a separate entity containing a controlled number of VO2 nanoparticles, which prevents the agglomeration problems seen in traditional methods while maintaining uniform optical properties across the entire coating.
2Ease of manufacture
If traditional manufacturing methods are used, then thermochromic coating is produced, but the process is costly and energy-intensive with poor control over particle size and distribution
Solution Approach 1:
The patent merges the nanoparticle synthesis and coating formation into a single electrospinning process. VO2 nanoparticles are synthesized directly within the polymer fiber matrix during electrospinning, eliminating separate synthesis and coating steps required by traditional methods, thereby reducing manufacturing cost and energy consumption while maintaining precise particle control.
Solution Approach 2:
The patent uses parameter changes in the electrospinning process (voltage, flow rate, distance, polymer concentration) to precisely control fiber diameter, nanoparticle distribution, and coating thickness. This provides manufacturing precision comparable to or exceeding traditional methods while being more cost-effective and energy-efficient.
3Reliability
If VO2 nanoparticle layer is embedded in electrospun nanofiber mat, then controlled temperature-dependent infrared radiation absorption is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent applies self-service by allowing the electrospinning process to automatically form the core-shell fiber structure and distribute nanoparticles uniformly through the action of electric field and solvent evaporation. The process self-regulates nanoparticle placement and fiber formation without requiring complex external control mechanisms, reducing manufacturing complexity while ensuring reliable thermochromic performance.
4Reliability
If refractive index-matched epoxy resin is used to encapsulate nanofiber mat, then transparency and durability are improved, but manufacturing time and process steps increase
Solution Approach 1:
The patent applies preliminary action by pre-matching the refractive index of the epoxy resin to the polymer fiber matrix before encapsulation. This preliminary selection of materials with compatible optical properties ensures transparency from the outset, eliminating the need for additional optical adjustment steps and reducing overall manufacturing time while maintaining durability.
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 solution provides a durable, environmentally stable, and energy-efficient thermochromic window with tunable thermal and optical properties, reducing energy consumption and CO2 emissions, and enabling large-scale production with improved solar modulation and transparency.
Implementation Method 1
a thermochromic fiber layer configured to block or permit transmission of electromagnetic radiation through the thermochromic fiber layer as a function of a temperature of the thermochromic fiber layer
Implementation Method 2
an electrospun nanofiber mat comprised of at least VO2 nanoparticles
Implementation Method 3
a refractive index-matched epoxy resin, allowing for controlled temperature-dependent infrared radiation absorption or reflection
Data Source
AI summary
In accordance with at least one aspect of this disclosure, a thermochromic window can include a first transparent layer, a second transparent layer, and a thermochromic fiber layer sandwiched between the first transparent layer and the second transparent layer. In certain embodiments, the thermochromic fiber layer may be embedded in the second transparent layer. The thermochromic window can be configured to selectively absorb or reflect infrared radiation (IR) as a function of a critical temperature.