Chemically-Assisted Nanotube Alignment in Extensible Structures
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Solution Overview
Problem
The random alignment of nanotubes within extensible structures, such as yarns and non-woven sheets, affects their physical and mechanical properties like tensile strength, electrical conductivity, and thermal conductivity, making it costly and cumbersome to address alignment issues during fabrication.
Innovation Solution
A method involving the addition of a chemical to wet the extensible structure, followed by stretching using a system with pinch rollers or opposing rollers to align nanotubes, enhancing contact points and properties, and subsequent washing and heat treatment to remove residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nanotubes are aligned during fabrication, then alignment quality is improved, but process complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by treating the extensible structure with a chemical solution before stretching to enable alignment. The chemical treatment prepares the nanotube surface and creates conditions that facilitate alignment during the subsequent stretching process, rather than requiring complex alignment mechanisms during fabrication
Solution Approach 2:
The patent replaces complex mechanical alignment systems with a chemical-mechanical hybrid approach. Instead of using sophisticated equipment to align nanotubes during fabrication, the invention uses chemical treatment followed by simple stretching, substituting complex mechanical alignment with a more economical process
2Manufacturing precision
If nanotubes are aligned during fabrication, then alignment quality is improved, but manufacturing cost increases
Solution Approach 1:
The chemical treatment is applied in advance before stretching, preparing the nanotubes for alignment. This preliminary chemical preparation enables effective alignment during simple stretching, avoiding the need for expensive real-time alignment equipment and reducing overall manufacturing costs
Solution Approach 2:
The patent changes the physical-chemical parameters of the nanotube structure through chemical treatment, making the nanotubes more responsive to stretching forces. This parameter change allows alignment to occur during simple mechanical stretching rather than requiring complex, expensive alignment processes
3Manufacturing precision
If chemical treatment is applied to wet the extensible structure, then nanotube alignment is improved, but residue removal complexity increases
Solution Approach 1:
The patent uses thermal treatment to induce phase transition from liquid residue to vapor, completely removing chemical residues. This phase transition approach provides a simple, effective method for residue removal that does not require complex mechanical or chemical cleaning systems
Solution Approach 2:
The patent replaces complex mechanical or chemical residue removal systems with thermal treatment. Instead of using sophisticated equipment to mechanically remove or chemically neutralize residues, the invention uses heat to evaporate residues, providing a simpler and more effective removal mechanism
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 significantly improves the alignment of nanotubes, increasing electrical and thermal conductivity, as well as tensile strength, while being economical and feasible post-structure formation.
Implementation Method 1
adding a chemical to the extensible structure having non-aligned nanotubes, so as to wet the extensible structure
Implementation Method 2
the extensible structure may be stretched to substantially align the nanotubes within the extensible structure relative to one another
Implementation Method 3
the stretched structure may be washed and/or exposed to heat in order to remove any residue
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
A method and system for aligning nanotubes within an extensible structure such as a yarn or non-woven sheet. The method includes providing an extensible structure having non-aligned nanotubes, adding a chemical mixture to the extensible structure so as to wet the extensible structure, and stretching the extensible structure so as to substantially align the nanotubes within the extensible structure. The system can include opposing rollers around which an extensible structure may be wrapped, mechanisms to rotate the rollers independently or away from one another as they rotate to stretch the extensible structure, and a reservoir from which a chemical mixture may be dispensed to wet the extensible structure to help in the stretching process.