CNT Transparent Heater Layout for Uniform Surface Heating
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Solution Overview
Problem
Transparent heaters with carbon nanotube (CNT) conductive layers experience temperature unevenness due to thickness differences between patterned and non-patterned portions, leading to inefficient heat distribution.
Innovation Solution
A transparent heater design with a conductive layer featuring patterned and non-patterned portions, where CNTs in the non-patterned portions are oriented at less than 45 degrees to enhance heat conduction from patterned to non-patterned areas, reducing temperature differences and unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the conductive layer has uniform thickness, then the manufacturing process is simpler, but temperature unevenness occurs due to different heat conduction requirements in patterned and non-patterned portions
Solution Approach 1:
The conductive layer is designed with different thicknesses in different regions: the patterned portion has a first thickness while the non-patterned portion has a second thickness that is 0.5 times to 2.0 times the first thickness. This local variation in thickness optimizes heat conduction in each region, allowing the layer to meet different thermal requirements without requiring complex manufacturing processes.
2Device complexity
If the non-patterned portion has the same thickness as the patterned portion, then the structure is simpler, but heat conduction from patterned to non-patterned areas is inefficient
Solution Approach 1:
The thickness parameter of the conductive layer is optimized to improve heat conduction. Specifically, the non-patterned portion has a thickness (second thickness) that is 0.5 times to 2.0 times the thickness of the patterned portion (first thickness). This parameter adjustment enhances thermal coupling between patterned and non-patterned areas, improving overall heat distribution efficiency.
3Loss of energy
If the conductive layer is made thicker to improve heat conduction, then heat distribution improves, but transparency to visible light decreases
Solution Approach 1:
Different thicknesses are applied to different functional regions: the patterned portion (which requires higher heat conduction) has a greater thickness, while the non-patterned portion has a reduced thickness (0.5 times to 2.0 times the patterned portion thickness) to maintain transparency. This localized thickness optimization allows the conductive layer to achieve both effective heat conduction and adequate light transmission.
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 orientation of CNTs in the non-patterned portions facilitates efficient heat transfer, reducing temperature differences and improving uniformity across the heater's surface, while maintaining transparency and electrical insulation properties.
Implementation Method 1
the carbon nanotubes has an orientation direction defining less than 45 degrees with respect to the second direction... facilitates efficient heat transfer, reducing temperature differences
Data Source
AI summary
A transparent heater includes: a substrate that is transparent to a visible light and has one surface; and a conductive layer that is disposed on the one surface, is transparent to the visible light, and contains an aggregate of carbon nanotubes. The conductive layer includes: a patterned portion that includes a linear portion linearly extending in a first direction parallel to the one surface; and a non-patterned portion that is a film-shaped portion connecting to the patterned portion in a second direction parallel to the one surface and orthogonal to the first direction, and has a thickness smaller than that of the patterned portion in a third direction orthogonal to the one surface. The non-patterned portion has an orientation direction of the carbon nanotubes defining less than 45 degrees with respect to the second direction, the orientation direction being measure by an orientation evaluation method.