Microsphere Thermal Insulation via Permeable-to-Impermeable Coating
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Solution Overview
Problem
Existing insulation materials, such as vacuum-insulated panels, face challenges due to fragility and degradation issues, limiting their flexibility and thermal performance in building applications, while alternative materials like aerogels are hindered by high production costs and mechanical weaknesses.
Innovation Solution
Development of microspheres with a porous core and a coating layer that transitions from permeable to impermeable, allowing for the maintenance of a partial vacuum and effective thermal insulation, using materials like glass and polymers, and embedding them in a matrix to create a scalable and efficient insulation medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If vacuum-insulated panels are used to achieve low thermal conductivity, then thermal performance is improved, but the panels are fragile and degrade over time
Solution Approach 1:
The vacuum insulation system is divided into discrete microspheres rather than a continuous panel structure. Each microsphere is a self-contained vacuum-insulated unit, allowing the system to maintain thermal performance while being more durable and flexible in application.
Solution Approach 2:
The invention uses a composite structure combining a porous core material with a sealed coating layer. The porous core provides structural integrity and the coating layer maintains the vacuum, creating a composite material that is both thermally insulating and mechanically durable.
2Temperature
If aerogels are used as core material for vacuum insulation, then thermal performance is improved, but production cost increases and mechanical properties worsen
Solution Approach 1:
The invention replaces expensive aerogel materials with more economical porous materials such as glass microspheres or other readily available porous substrates. While individual microspheres have limited vacuum lifetime, the overall system achieves cost-effective insulation through scalable manufacturing.
Solution Approach 2:
The invention changes the material parameters from high-performance but expensive aerogels to more economical porous materials with appropriate pore structures. The key parameter is the porosity and pore size distribution, which can be achieved with cheaper materials while maintaining thermal insulation performance.
3Temperature
If hollow particles are evacuated to achieve high thermal insulation, then thermal performance is improved, but fabrication becomes difficult and expensive
Solution Approach 1:
The porous core structure is pre-formed with open pores before vacuum evacuation. This preliminary preparation allows straightforward evacuation processes without requiring complex in-situ vacuum creation, simplifying the overall fabrication sequence.
Solution Approach 2:
The invention utilizes materials with inherent porous structures that naturally facilitate vacuum evacuation. The porous morphology provides efficient gas evacuation pathways while maintaining structural integrity, reducing the complexity of the evacuation process compared to dense hollow structures.
4Stability of the object's composition
If closed-cell core materials are used to maintain vacuum, then structural stability is improved, but evacuation after fabrication is impossible
Solution Approach 1:
The porous core is prepared with open pores before sealing, allowing vacuum evacuation to occur during or immediately after coating application. The structural stability is then maintained by the rigid porous framework even after the coating seals the pores.
Solution Approach 2:
The coating layer transitions from a permeable state during evacuation to an impermeable sealed state afterward. This dynamic behavior allows the system to be evacuated through the porous structure initially, then maintains vacuum stability once sealed, combining evacuation capability with long-term structural stability.
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 enhanced thermal resistance and flexibility, enabling high-performance thermal insulation with reduced material costs and improved durability, suitable for building applications and other uses like gas storage and drug delivery.
Implementation Method 1
The coating layer can include a coating material which transitions from a first state to a second state. In the first state the coating material is permeable to the gas, and in the second state the material is impermeable to the gas.
Implementation Method 2
The porous core can include a structure of interconnected pores or channels. Some of the gas will diffuse through the coating material in the first state to establish a partial vacuum of the gas within the porous core.
Implementation Method 3
An insulation medium includes a plurality of microspheres... The coating material in the second state is configured to encapsulate and maintain partial vacuum of the gas inside the porous core
Data Source
AI summary
A fluid storage media includes a plurality of microspheres. Each microsphere includes a porous core with a porous core material and having an exterior surface. A stored fluid is within the porous core. A coating layer covers all of the exterior surface of the porous core. The coating layer includes a coating material which transitions from a first state to a second state, wherein in the first state the coating material is permeable to the stored fluid, and in the second state the material is impermeable to the stored fluid. The coating material in the second state is configured to encapsulate and maintain the stored fluid inside the porous core. A method of making a fluid storage media, a method of delivering a fluid and a method of delivering a biologically active fluid medication to a patient are also disclosed.