Patterned Carbon Nanotube Composite for Thermal Management
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Solution Overview
Problem
Existing thermally conductive materials made with carbon nanotubes are thick and lack flexibility due to random CNT orientation, which hinders efficient heat transfer from electronic devices to heat sinks.
Innovation Solution
A method for manufacturing a carbon nanotube composite material with controlled CNT orientation in desired patterns, involving a substrate, catalyst film formation, CNT array growth, protective layer application, and matrix material filling to create a thin, thermally and electrically conductive composite with exposed end portions for improved heat and electrical conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If CNTs are dispersed randomly in matrix material by injection molding, then the material can be manufactured easily, but the thermal conductivity is reduced because heat cannot spread efficiently
Solution Approach 1:
The patent applies preliminary action by pre-aligning carbon nanotubes in a desired orientation pattern before forming the final composite material. The CNTs are oriented in a unidirectional or patterned arrangement prior to being embedded in the matrix material, ensuring that heat transfer pathways are established in advance rather than relying on random dispersion. This preliminary orientation step resolves the contradiction by maintaining manufacturing feasibility while significantly improving thermal conductivity through controlled CNT alignment.
Solution Approach 2:
The patent changes the orientation parameter of carbon nanotubes from random to controlled/unidirectional. By transforming the spatial distribution parameter of CNTs from isotropic (random) to anisotropic (aligned), the material achieves enhanced thermal conductivity in specific directions while maintaining ease of manufacture through established alignment techniques. This parameter change directly addresses the contradiction between manufacturing ease and thermal performance.
2Reliability
If the thermally conductive material is made thick to ensure sufficient heat transfer path, then heat transfer capacity is improved, but the bulk increases and flexibility is reduced
Solution Approach 1:
The patent employs composite materials by combining aligned carbon nanotubes with a matrix material to create a hybrid structure. The CNTs form a continuous, oriented network that provides efficient heat transfer pathways, while the matrix material provides structural support and flexibility. This composite approach allows the material to achieve high heat transfer capacity in thin configurations, resolving the contradiction between heat transfer capacity and flexibility by leveraging the complementary properties of both materials.
Solution Approach 2:
The patent applies local quality by concentrating the heat transfer function in the aligned carbon nanotube regions while the matrix material provides structural properties. The CNTs are strategically positioned and oriented in specific areas to create high-conductivity pathways, allowing thin sections of the material to achieve sufficient heat transfer capacity without compromising overall flexibility. This localized functional differentiation resolves the contradiction between thickness requirements for heat transfer and flexibility requirements.
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 method results in a thin, flexible carbon nanotube composite material with enhanced thermal and electrical conductivity, allowing for efficient heat transfer and improved electrical connections, suitable for large-scale electronic components.
Implementation Method 1
forming a catalyst film in a desired pattern on the surface of the substrate; forming a carbon nanotube array on the catalyst film
Implementation Method 2
The thermally conductive material is formed by injection molding and has numerous CNTs dispersed in a matrix material. The thermally conductive material includes a first surface engaging with an electronic device, and a second surface engaging with a heat sink.
Implementation Method 3
CNTs have a high Young's modulus, a high thermal conductivity, and a high electrical conductivity
Data Source
AI summary
A method for manufacturing the carbon nanotube composite material includes the steps of: providing a substrate, the substrate having a surface; forming a catalyst film in a special predetermined pattern on the surface of the substrate; forming a carbon nanotube array on the catalyst film to obtain the carbon nanotube array having a special predetermined pattern; providing a pair of protective layers, the protective layers being attached on a corresponding portion of ends of CNT array; filling clearances existing among CNTs of the CNT array and between the two protective layers with a matrix material; and removing the protective layers from CNT array.