Aligned Carbon Nanotube Array in Polymer Matrix
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Solution Overview
Problem
Carbon nanotubes are difficult to align and disperse due to their strong affinity for each other, which limits their commercial usage in applications such as high-definition displays and electronic devices.
Innovation Solution
A method involving the mixing of carbon nanotubes with an encapsulant material, followed by a modified fiber drawing technique to align and disperse them within channels of a nonconductive matrix, achieving a high density array with anisotropic electrical and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If carbon nanotubes are grown from metal catalysts to achieve vertical alignment, then alignment is improved, but the nanotubes tend to clump together and are difficult to activate individually
Solution Approach 1:
The patent uses a polymer matrix as an intermediary medium to disperse carbon nanotubes while maintaining their alignment. The polymer acts as a mediator that prevents direct contact between nanotubes, reducing van der Waals attraction and clumping, while still allowing the nanotubes to be vertically oriented within the matrix structure.
Solution Approach 2:
The patent creates a composite material system combining carbon nanotubes with a polymer matrix. This composite approach allows the nanotubes to maintain their aligned structure while the polymer provides dispersion and prevents aggregation, solving both alignment and dispersion requirements simultaneously.
2Power
If carbon nanotubes are used as electron-emitting sources, then field emission efficiency is improved, but processing challenges limit commercial usage
Solution Approach 1:
The patent changes the physical and chemical parameters of the carbon nanotube system by incorporating them into a polymer matrix at controlled concentrations and orientations. This parameter modification enables easier processing and manufacturing while preserving the field emission properties, making commercial application feasible.
Solution Approach 2:
The patent applies local quality by creating regions with specific nanotube concentrations and orientations within the polymer matrix. This allows optimization of field emission performance in specific areas while maintaining overall processability and manufacturability of the material.
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 highly conductive composite with aligned carbon nanotubes, significantly reducing resistivity and enhancing electrical conductivity along the channels while maintaining non-conductivity in the transverse direction, facilitating their use in advanced electronic devices.
Implementation Method 1
drawing the first tube including the mixture into a drawn fiber at an elevated temperature so that the plurality of carbon nanotubes attain a first average alignment in a drawing direction
Implementation Method 2
The bundle of fiber segments is drawn into a drawn bundle at the elevated temperature. The plurality of carbon nanotubes attain a second average alignment in the drawing direction within channels of the drawn bundle, where the second average alignment is higher than the first average alignment
Implementation Method 3
A plurality of carbon nanotubes are disposed in each of the channels, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 Ωm or less
Data Source
AI summary
An array of aligned and dispersed carbon nanotubes includes an elongate drawn body including a plurality of channels extending therethrough from a first end to a second end of the body, where the channels have a number density of at least about 100,000 channels/mm2 over a transverse cross-section of the body. A plurality of carbon nanotubes are disposed in each channel, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 Ωm or less.