Carbon Nanotube Sheet Formation via Capillary Tube Alignment
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Solution Overview
Problem
Current methods face challenges in translating the superior properties of carbon nanotubes to meso- or macro-scale structures, as there is a lack of effective means to assemble them into engineering materials or structures.
Innovation Solution
An apparatus and method involving a bath with capillary tubes and an electric driving unit to form carbon nanotube sheets by driving a carbon nanotube colloidal solution through the capillary tubes, using an electric field to align and grow the nanotubes into a continuous thin film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon nanotubes are assembled into meso- or macro-scale structures, then the superior mechanical, thermal and electrical properties of CNTs can be translated to engineering materials, but the challenge lies in finding an effective means to bridge the gap between raw CNTs and engineering materials
Solution Approach 1:
The patent employs capillary action through vertically arranged capillary tubes to transport carbon nanotube colloidal solution from the bath to the substrate. This hydraulic principle enables automatic, controlled transport of the colloidal solution without complex pumping mechanisms, resolving the contradiction by providing an easy manufacturing method while achieving strong CNT assemblies through controlled deposition and alignment
Solution Approach 2:
The patent introduces a colloidal solution as an intermediary medium to bridge raw carbon nanotubes and engineering materials. The colloidal solution suspends individual CNTs and enables their controlled deposition onto substrates through capillary tubes, transforming raw nanotubes into structured engineering materials with superior mechanical properties while simplifying the assembly process
2Reliability
If carbon nanotubes are assembled into meso- or macro-scale structures, then engineering materials with superior properties can be created, but considerable efforts and complexity are required in the development of CNT assemblies
Solution Approach 1:
The patent segments the assembly process into simple, modular components: a bath containing colloidal solution, vertically arranged capillary tubes, and a substrate. This segmentation reduces device complexity while ensuring reliable electrical conductivity through controlled CNT alignment and continuous deposition, eliminating the need for complex assembly structures
Solution Approach 2:
The capillary tubes utilize self-service through capillary action to automatically transport the colloidal solution and deposit CNTs onto the substrate. This self-driven mechanism eliminates complex pumping and control systems, reducing device complexity while maintaining reliable electrical conductivity through consistent, controlled deposition
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
This approach enables the formation of high-transparency, high-conductivity carbon nanotube sheets that can be used in various applications, such as polarizers and armors, with enhanced tensile strength and Young's modulus, by aligning and growing carbon nanotubes into a 2-dimensional structure.
Implementation Method 1
The bottom surface is capable of having an array of capillary tubes
Implementation Method 2
driving at least a part of the carbon nanotube colloidal solution out of the bath through the array of capillary tubes
Data Source
AI summary
An apparatus for forming a carbon nanotube sheet is provided. The apparatus includes a bath and a driving unit wherein the bath has a bottom surface and is configured to contain a carbon nanotube colloidal solution. The bottom surface is capable of having an array of capillary tubes. The driving unit is configured to drive at least a part of the carbon nanotube colloidal solution out of the bath through the array of capillary tubes.