Heat storage device and method for producing the same
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Solution Overview
Problem
Existing light-absorbing heat-storing materials emit excessive radiation in the far-infrared region and lack effective heat storage properties, and existing techniques for producing versatile metal films are impractical for various applications.
Innovation Solution
A heat storage device with a metal layer featuring a protrusion-and-recess shape, where the protrusions and recesses have heights between 100 nm and 1,000 nm, is developed, allowing for both efficient light absorption in the visible and near-infrared regions and low radiation in the far-infrared region, achieved through a process involving the formation of a metal oxide protrusion-and-recess shape and subsequent metal layer deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a black-colored material with fine protrusion-and-recess shape is used to absorb visible light, then light absorption is improved, but far-infrared radiation increases and heat storage properties deteriorate
Solution Approach 1:
The invention applies different surface structures to different wavelength regions: protrusions with heights of 100-1000 nm are specifically designed to absorb visible and near-infrared light, while the same structure combined with selective metal layer deposition creates high reflectance in the far-infrared region. This local quality differentiation resolves the contradiction by making the surface structure wavelength-selective.
Solution Approach 2:
The invention uses composite structures combining metal oxide protrusions with specific metal layers (such as aluminum, silver, or gold). The metal oxide provides the protrusion structure for visible light absorption, while the metal layer provides far-infrared reflectance. This composite approach allows simultaneous achievement of both light absorption and reduced far-infrared radiation.
2Shape
If injection molding with a metal surface mold is used to create microstructure, then resin surface microstructure is formed, but versatile metal film formation is not achieved and practical use is limited
Solution Approach 1:
The invention separates the mold into two functional parts: a metal oxide mold that creates the protrusion structure, and a separate metal layer that is deposited afterward. This segmentation allows the metal layer to be independently selected and optimized for different applications, achieving versatility in metal film formation while maintaining the desired surface microstructure.
Solution Approach 2:
The metal oxide protrusion structure is formed in advance as a preliminary step before metal layer deposition. This preliminary action creates a stable substrate that can accommodate various metal layers, enabling versatile metal film formation for different practical applications without reworking the mold.
3Use of energy by moving object
If oxidized nickel plating is used to create fine protrusion-and-recess shape, then light absorption is improved, but far-infrared radiation remains high and heat storage properties are insufficient
Solution Approach 1:
The invention changes the material parameter from oxidized nickel plating to metal oxide protrusions combined with specific metal layers. This parameter change allows optimization of both visible light absorption (through the protrusion structure) and far-infrared reflectance (through the metal layer selection), thereby improving heat storage properties and reliability.
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 device exhibits excellent light absorption and heat storage properties, efficiently absorbing visible light while minimizing far-infrared radiation, thereby achieving high heat storage efficiency.
Implementation Method 1
light-absorbing heat-storing materials absorb electromagnetic waves (light) in the visible region
Implementation Method 2
emit little electromagnetic waves (light) in the infrared region
Data Source
AI summary
A heat storage device including a metal layer containing a protrusion-and-recess-shaped object, in which the protrusion-and-recess-shaped object has an average height of 100 nm or more and 1,000 nm or less.