Aligned Carbon Nanotube Growth for Uniform Composite Reinforcement
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Solution Overview
Problem
Existing methods for producing composite materials with carbon nanotubes face challenges such as poor alignment, agglomeration, and dispersion of carbon nanotubes, leading to materials with inadequate mechanical, thermal, and electrical properties.
Innovation Solution
A method involving the growth of substantially aligned nanostructures on a substrate, followed by their uniform dispersion and binding within composite articles, utilizing a catalyst material and controlled conditions to achieve aligned nanostructures with enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional CNT synthesis methods are used, then CNT structures are produced, but the CNTs have large diameter and insufficient length resulting in poor alignment
Solution Approach 1:
The patent introduces an intermediary substrate with catalyst particles that mediates the CNT growth process. The substrate acts as a platform that enables controlled nucleation and growth of CNTs with desired alignment, bridging the gap between conventional synthesis and aligned structure production.
Solution Approach 2:
The patent changes key growth parameters including catalyst particle size (5-50 nm), substrate temperature (600-900°C), and carbon source flow rates to control CNT diameter (10-100 nm), length (1-100 μm), and alignment. These parameter adjustments resolve the contradiction by enabling precise structural control.
2Manufacturing precision
If CNTs are dispersed in secondary materials, then composite materials are formed, but CNT agglomeration hinders uniform wetting and dispersion
Solution Approach 1:
The patent performs preliminary actions by pre-aligning CNTs on the substrate and pre-forming the composite structure with the secondary material before final processing. This preliminary arrangement prevents agglomeration during subsequent handling and ensures uniform dispersion throughout the composite.
Solution Approach 2:
The patent applies local quality by ensuring CNTs are uniformly distributed and aligned at the micro-scale level across the entire substrate surface. Each local region receives controlled CNT deposition with consistent spacing and orientation, preventing agglomeration and achieving homogeneous composite properties.
3Strength
If alignment of CNTs in secondary materials is attempted, then reinforced composite materials can be formed, but alignment is difficult to achieve particularly in systems with large advanced fibers
Solution Approach 1:
The patent segments the alignment process into distinct stages: (1) CNT nucleation and growth on catalyst particles, (2) substrate-based alignment during growth, (3) transfer to secondary material, and (4) final positioning. This segmentation makes the complex alignment task manageable and achieves high alignment in multi-component systems.
Solution Approach 2:
The substrate serves as an intermediary that temporarily holds and aligns CNTs before transfer to the secondary material. This intermediary platform enables precise alignment control during CNT growth and facilitates subsequent integration with large advanced fibers without losing alignment.
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 enables the production of composite materials with improved mechanical, thermal, and electrical properties by ensuring uniform alignment and dispersion of nanostructures, enhancing the material's performance and scalability.
Implementation Method 1
utilizing a catalyst material and controlled conditions to achieve aligned nanostructures
Data Source
AI summary
The present invention provides methods for uniform growth of nanostructures such as nanotubes (e.g., carbon nanotubes) on the surface of a substrate, wherein the long axes of the nanostructures may be substantially aligned. The nanostructures may be further processed for use in various applications, such as composite materials. For example, a set of aligned nanostructures may be formed and transferred, either in bulk or to another surface, to another material to enhance the properties of the material. In some cases, the nanostructures may enhance the mechanical properties of a material, for example, providing mechanical reinforcement at an interface between two materials or plies. In some cases, the nanostructures may enhance thermal and/or electronic properties of a material. The present invention also provides systems and methods for growth of nanostructures, including batch processes and continuous processes.