Tungsten Bronze Complex for Thermal Isolation
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Solution Overview
Problem
Current thermal isolation materials for windows and vehicles face challenges in achieving high visible light transmittance while maintaining high infrared radiation absorption efficiency, which is essential for energy savings and carbon reduction.
Innovation Solution
A tungsten bronze complex with a specific formula (M1xM2yWOz) is developed, comprising a mixture of cubic and hexagonal tungsten bronze, where M1 is Li or Na, and M2 is K, Rb, or Cs, which is fabricated through a method involving tungsten-containing precursors, alkali metal compounds, and thermal treatment to achieve the desired molar ratios and particle sizes, resulting in a material that effectively absorbs infrared radiation while allowing high visible light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If metal oxides are used in thermal isolation film, then infrared radiation absorption efficiency is improved, but visible light transmittance deteriorates
Solution Approach 1:
The patent uses tungsten bronze complex as a composite material that combines multiple metal elements (M1 and M2) with tungsten in a specific ratio. This composite structure enables simultaneous achievement of high infrared absorption efficiency and high visible light transmittance, resolving the contradiction between energy loss reduction and illumination maintenance.
Solution Approach 2:
The patent optimizes the stoichiometric parameters of the tungsten bronze complex by controlling the ratios of M1, M2, and W atoms. By adjusting these compositional parameters within specific ranges, the material achieves optimal balance between infrared absorption and visible light transmission properties.
2Loss of energy
If thermal isolation film is formed on window glass, then energy savings are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent controls the formation of cubic and hexagonal phases by adjusting thermal treatment parameters (temperature and time). This parameter optimization simplifies the manufacturing process by achieving desired material properties through controlled heating rather than complex multi-step synthesis procedures.
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 tungsten bronze complex achieves over 65% average visible light transmittance and superior infrared radiation absorption efficiency, outperforming comparative examples by effectively balancing transmittance and absorption requirements.
Implementation Method 1
a thermal isolation material having a high visible light transmittance and a high infrared radiation absorption efficiency
Implementation Method 2
high visible light transmittance
Implementation Method 3
subjecting the mixture to a thermal treatment, obtaining the aforementioned infrared absorption material. The thermal treatment includes a first heating step and a second heating step
Data Source
AI summary
The disclosure provides an infrared absorption material, a method for fabricating the same, and a thermal isolation structure employing the same. The infrared absorption material includes a tungsten bronze complex having a formula of M1xM2yWOz, wherein 0.6≦x≦0.8, 0.2≦y≦0.33, 0.8≦x+y<1, and 2≦z≦3; M1 is Li, or Na; and, M2 is K, Rb, or Cs. In particular, the tungsten bronze complex consists of a cubic tungsten bronze (CTB) and a hexagonal tungsten bronze (HTB).