Carbon Nanotube Film Graphite Composite Structure
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Solution Overview
Problem
Conventional carbon nanotube structures, joined only by van der Waals attractive forces, lack sufficient mechanical strength for macro-scale applications, limiting their use in structures like carbon nanotube wires.
Innovation Solution
A composite carbon nanotube structure is created by combining carbon nanotubes with a polymer, where the polymer is dissolved in an organic solvent to infiltrate the intertube spaces, and then graphitized at high temperatures to form carbon-carbon bonds with the nanotubes, enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If carbon nanotubes are joined only by van der Waals attractive force, then the structure is simple and easy to form, but the mechanical strength is insufficient for macro-scale applications
Solution Approach 1:
The patent applies composite materials by combining carbon nanotubes with a carbon-containing polymer matrix. The polymer infiltrates the intertube spaces between nanotubes and forms carbon-carbon bonds through graphitization, creating a composite structure that maintains the ease of nanotube assembly while significantly enhancing mechanical strength through covalent bonding.
Solution Approach 2:
The patent employs parameter changes by transforming the polymer from a molecular state through high-temperature graphitization (2000-4000°C). This parameter change converts the polymer into a graphite structure that forms strong carbon-carbon bonds with the nanotubes, thereby increasing mechanical strength while maintaining structural integrity.
2Strength
If polymer is added to form composite structure, then mechanical strength is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by first forming the carbon nanotube array structure before introducing the polymer. The polymer is then infiltrated into the pre-formed intertube spaces, and finally graphitized in situ. This sequence simplifies the overall process compared to attempting to form composites simultaneously, as each step builds upon the previous structure.
Solution Approach 2:
The patent employs self-service through in situ graphitization where the polymer transforms into graphite directly within the nanotube assembly. The carbon-containing polymer serves its dual function as both structural filler and bonding agent, eliminating the need for separate graphite introduction steps and reducing process complexity.
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 composite structure exhibits improved mechanical strength due to the integration of carbon nanotubes with a graphite structure, allowing for the formation of robust, free-standing structures with increased durability and versatility.
Implementation Method 1
the polymer is dissolved in an organic solvent to infiltrate the intertube spaces
Implementation Method 2
infiltrate the intertube spaces
Implementation Method 3
graphitized at high temperatures to form carbon-carbon bonds with the nanotubes
Implementation Method 4
form carbon-carbon bonds with the nanotubes
Implementation Method 5
The carbon nanotubes joined end to end by van der Waals attractive force therebetween
Data Source
AI summary
A composite carbon nanotube structure includes a carbon nanotube film structure and a graphite structure. The carbon nanotube structure defines a number of micropores therein. The graphite structure and the carbon nanotube film structure are composited together. The graphite structure comprising a number of graphite segments filled in the micropores.