Colloidally-Protected Wax Microstructures for Thermal Storage
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Solution Overview
Problem
Existing phase-change materials (PCMs) face challenges in cost-effective production and efficiency due to the need for physical deposition of polymeric shells, which can interfere with the core material's functionality and require organic solvents, limiting their application in building insulation and other uses.
Innovation Solution
Colloidally-protected wax-based microstructures with a wax core and polymeric shell, where the polymeric shell is adhered via secondary forces rather than mechanical deposition, using paraffin waxes with tailored melting points and a range of polymeric materials like polyvinyl alcohol, allowing for efficient heat storage and release without the need for physical encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical deposition of polymeric shells is used to encapsulate PCM core material, then the PCM is protected and contained, but the core material's functionality is interfered with and organic solvents are required
Solution Approach 1:
The patent replaces the mechanical physical deposition process with a chemical adsorption process. The polymeric shell is formed through chemical adsorption of polymer molecules onto the PCM core surface, eliminating the need for mechanical deposition equipment and organic solvent-based processes. This chemical approach maintains containment while preserving core functionality.
Solution Approach 2:
The patent changes the fundamental parameter of shell formation from physical/mechanical to chemical. By using chemical adsorption mechanisms, the polymer shell forms through molecular-level interactions rather than physical coating, thereby eliminating interference with core material properties and avoiding organic solvent requirements.
2Reliability
If physical deposition methods are used to create polymeric shells, then encapsulation is achieved, but production cost and complexity increase
Solution Approach 1:
The patent eliminates complex mechanical deposition systems by using chemical adsorption processes that can be implemented through simple mixing and heating steps. This substitution dramatically reduces equipment requirements, process complexity, and manufacturing costs while achieving reliable encapsulation.
Solution Approach 2:
The polymeric shell forms through self-assembly via chemical adsorption onto the PCM core surface. The process is self-driven by thermodynamic principles of adsorption, eliminating the need for complex external control systems, specialized equipment, and multi-step manufacturing procedures.
3Reliability
If thick polymeric shells are deposited physically, then PCM is well protected, but thermal performance is reduced
Solution Approach 1:
The patent changes the shell formation mechanism from physical deposition to chemical adsorption, which naturally produces ultra-thin shell layers at the molecular level. This parameter change ensures maximum thermal contact between the shell and core material, maintaining high heat transfer efficiency while providing adequate protection.
Solution Approach 2:
The chemical adsorption process creates a shell with non-uniform thickness distribution optimized for thermal performance. The shell forms preferentially at the core surface with minimal thickness, providing localized protection where needed while minimizing thermal resistance. This local optimization maintains energy efficiency.
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
This solution provides a cost-effective and efficient method for phase-change materials that can be used in various applications, including building insulation, with improved thermal performance and reduced environmental impact, as it maintains high latent heat storage density and stability across a wide temperature range.
Implementation Method 1
the polymeric shell is adhered via secondary forces rather than mechanical deposition
Implementation Method 2
PCMs take advantage of the latent heat that can be stored or released from a material over a narrow temperature range
Implementation Method 3
Heat is absorbed or released when the material changes from solid to liquid and vice versa
Data Source
AI summary
This invention generally relates to phase-change materials (“PCM” or “PCM materials”) made from colloidally-protected wax-based microstructures. This invention also relates to such PCM materials configured in various physical forms. This invention further relates to a process of configuring such PCM materials for a variety of end-use applications in which dampening of temperature fluctuations by absorption and desorption of heat is desired. This invention further relates to preparing colloidally-protected wax-based microstructures in particulate form that function as PCM materials.