Magnet Module for Removing Ferromagnetic Impurities in Carbon Nanotube Dispersion
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Solution Overview
Problem
The existing methods for defibrating single-walled carbon nanotubes (SWCNTs) using shear stress face pipe clogging issues due to iron catalyst precursors and carbon nanotube aggregates, especially when the inner diameter of the pipe is reduced to increase shear stress, leading to insufficient defibration.
Innovation Solution
A magnet module is used to attract and remove ferromagnetic impurities from carbon nanotubes, allowing for sufficient defibration and dispersion of carbon nanotubes in a medium liquid, while preventing pipe clogging by employing a magnet module with a tubular pipe portion and spherical magnets that move freely within, ensuring the carbon nanotubes are effectively defibrated and dispersed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the inner diameter of the pipe is reduced to increase shear stress, then the defibration of carbon nanotubes is improved, but pipe clogging occurs due to iron catalyst precursors and carbon nanotube aggregates
Solution Approach 1:
The invention extracts and removes ferromagnetic impurities (iron catalyst precursors) from the carbon nanotube suspension using a magnet module before the defibration process. This prevents the impurities from causing pipe clogging while allowing the use of small inner diameter pipes for effective defibration, thus resolving the contradiction between defibration quality and pipe clogging.
Solution Approach 2:
The invention performs preliminary removal of ferromagnetic impurities using a magnet module before the carbon nanotubes enter the defibration pipe. This preliminary action prevents clogging from occurring during the defibration process, enabling reliable operation with small inner diameter pipes that provide sufficient shear stress for high-quality defibration.
2Reliability
If a magnet module is added to remove ferromagnetic impurities, then pipe clogging is prevented, but device complexity increases
Solution Approach 1:
The magnet module serves multiple functions: it removes ferromagnetic impurities from the suspension and also prevents pipe clogging by eliminating the root cause. This multi-functionality justifies the addition of the module while providing dual benefits, thus resolving the contradiction between reliability improvement and device complexity.
3Device complexity
If traditional shearing methods are used without impurity removal, then device complexity is low, but defibration is insufficient due to pipe clogging
Solution Approach 1:
The invention performs preliminary removal of ferromagnetic impurities using a simple magnet module before the defibration process. This preliminary action prevents pipe clogging that would otherwise limit defibration quality, enabling the use of small inner diameter pipes for high-quality defibration while maintaining overall process simplicity.
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 magnet module enables efficient defibration and dispersion of carbon nanotubes, producing a reliable and inexpensive nanocarbon dispersion liquid by effectively removing ferromagnetic impurities, thus overcoming the clogging issues associated with traditional methods.
Implementation Method 1
a ferromagnetic impurity attached to the carbon nanotube is attracted to the magnet and removed
Implementation Method 2
a method for applying shear stress to defibrate SWCNTs by pressurizing and introducing a solution containing the SWCNTs into a thin pipe
Data Source
AI summary
A magnet module used for producing a carbon nanotube dispersion liquid, comprising: a pipe portion having a first opening connected to a shearing module, and a second opening at both ends; and a magnet disposed in the pipe portion, wherein a medium liquid containing the carbon nanotube defibrated by the shearing module is supplied through the first opening, and after a ferromagnetic impurity attached to the carbon nanotube is attracted to the magnet and removed, the medium liquid is discharged from the second opening.