Thermoregulating Composite Films with Tunable IR Reflection
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Solution Overview
Problem
Current thermoregulating solutions for hot beverage containers, such as ceramic mugs and insulated metal thermoses, face challenges including high manufacturing costs, impractical recyclability, inconvenient form factors, and a large carbon footprint. Additionally, these solutions often struggle with controlled heat dissipation, failing to maintain optimal external and internal temperatures for both the container and the beverage.
Innovation Solution
The development of scalable fabrication methods for thermoregulating composite materials with adjustable IR-reflectance properties. These materials consist of a flexible substrate with a planar layer of an IR-reflecting material, topped with columnar nanostructures, coated with an IR-transparent polymer, and delaminated to create a free-standing film with embedded nanostructures. This process allows for the production of large-area composite materials with tunable heat management properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermoregulating solutions (ceramic mugs, insulated metal thermoses) are used, then heat management function is provided, but manufacturing cost increases and recyclability becomes impractical
Solution Approach 1:
The patent employs a composite material structure consisting of an elastomeric matrix embedded with infrared-reflecting materials (such as metal flakes or nanoparticles). This composite approach enables effective heat management by combining the thermal properties of different materials, achieving thermoregulating functionality while maintaining compatibility with inexpensive, recyclable polymer substrates.
Solution Approach 2:
The patent utilizes phase change materials (PCMs) that undergo phase transitions (solid-liquid) at specific temperatures to absorb or release heat. By selecting PCMs with appropriate phase change temperatures, the system can maintain optimal beverage temperatures during thermal transitions, providing active thermoregulation without complex mechanical insulation structures.
2Temperature
If conventional insulated containers are used, then thermal insulation is provided, but control over heat dissipation rate is insufficient
Solution Approach 1:
The patent incorporates dynamic control mechanisms that allow the thermoregulating system to adjust its thermal properties in response to temperature changes or user input. This may include temperature-responsive materials that change their thermal conductivity or phase change characteristics based on ambient conditions, enabling adaptive heat dissipation control rather than passive insulation.
Solution Approach 2:
The patent employs phase change materials that automatically regulate heat transfer through phase transitions. When the beverage temperature approaches the PCM's phase change point, the material absorbs excess heat during melting or releases heat during freezing, providing automatic temperature control and enabling precise management of heat dissipation rates without active control systems.
3Temperature
If existing thermoregulating materials are used, then some thermal control is achieved, but precision in maintaining optimal temperature ranges is insufficient
Solution Approach 1:
The patent utilizes phase change materials with precisely defined phase change temperatures that correspond to optimal beverage serving temperatures. By selecting PCMs with specific transition points (e.g., 4°C for cold beverages, 60-70°C for hot beverages), the system achieves precise temperature maintenance during the phase transition process, ensuring beverages are kept at optimal temperatures without overheating or excessive cooling.
Solution Approach 2:
The patent employs composite structures combining elastomeric matrices with embedded infrared-reflecting materials and phase change materials. This multi-component composite enables precise thermal control by combining the thermal mass of PCMs with the thermal insulation and IR reflection properties of the composite structure, achieving superior temperature precision compared to single-material solutions.
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 thermoregulating composite materials effectively manage heat transfer between a package's content and its environment with minimal external energy input, offering precise control over temperature ranges. They are scalable, sustainable, inexpensive to manufacture, and easily recyclable, addressing the limitations of existing solutions.
Implementation Method 1
depositing a planar layer comprising a first IR-reflecting material... to produce a free standing film comprising the composite material with adjustable IR-reflecting properties
Implementation Method 2
growing a plurality of columnar nanostructures comprising a second IR-reflecting material on top of the planar layer at an angle relative to the planar layer
Implementation Method 3
coating the nanostructured layer with an IR-transparent polymer... such that the nanostructured layer becomes embedded into the elastomeric matrix
Data Source
AI summary
Methods for large scale fabrication of thermoregulating composite materials and parts comprising thereof are described, as well as methods for heat management using the same. The fabrication methods are easily scalable, highly modular, inexpensive, and capable of producing large area, thin, flexible films of any shape, and having tunable dynamic heat-management properties actuated via low energy input mechanical strain.