Carbon Nanotube Dispersion with Shear Bending and Laser Cutting
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Solution Overview
Problem
Carbon nanotubes often aggregate during synthesis, leading to increased viscosity and difficulty in uniform dispersion, which hampers their effective use in composite materials, particularly in forming efficient electron conduction paths and three-dimensional network structures.
Innovation Solution
A system and method involving a mixing device, a first dispersion device with a rotor and stator, and a second dispersion device using laser irradiation to de-bundle, bend, and selectively cut carbon nanotubes, minimizing mechanical damage and optimizing dispersion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If carbon nanotubes are dispersed in liquid or slurry, then uniform dispersion is achieved, but aggregation occurs due to Van der Waals force increasing viscosity
Solution Approach 1:
The patent introduces a multi-stage dispersion system with rotor-stator homogenizers and ultrasonic treatment as intermediary devices between the aggregated carbon nanotubes and the final dispersion liquid. These intermediaries apply mechanical shear forces and cavitation effects to break aggregates into individual nanotubes, preventing re-aggregation and achieving stable uniform dispersion in the liquid medium.
2Stability of the object's composition
If mechanical dispersion methods are used to separate carbon nanotubes, then aggregation is reduced, but physical damage occurs to the nanotubes
Solution Approach 1:
The patent divides the dispersion process into multiple sequential stages: initial mixing, rotor-stator homogenization at controlled shear rates, ultrasonic treatment at optimized power levels, and final circulation. Each stage applies progressively milder mechanical forces, allowing gentle separation of aggregates while preserving nanotube integrity. The segmented approach prevents excessive mechanical stress that would cause physical damage.
3Ease of operation
If carbon nanotubes are used in aggregated state, then handling is difficult due to increased viscosity, but manufacturing process is simpler
Solution Approach 1:
The patent implements preliminary dispersion actions during the manufacturing process itself, using integrated rotor-stator homogenizers and ultrasonic generators built into the mixing system. These devices perform aggregate breakdown and individual nanotube separation before the material is transferred to storage or application vessels. This preliminary action ensures low-viscosity, easily handleable dispersion liquid without requiring additional post-processing steps.
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 effectively disperses carbon nanotubes without causing physical damage, enhancing their mechanical and electrical properties by breaking aggregates and forming bent portions that can be selectively cut, thereby improving the quality of the dispersion liquid.
Implementation Method 1
perform a primary dispersion of the carbon nanotubes by an operation of a rotor and a stator, and then perform a secondary dispersion to form bent portions in the carbon nanotubes
Implementation Method 2
perform a tertiary dispersion of the carbon nanotubes to selectively cut the bent portions of the carbon nanotubes by irradiating a laser when the secondarily dispersed admixture recirculates to the mixing device
Data Source
AI summary
Provided are a system for manufacturing dispersion liquid of carbon nanotubes and a method of manufacturing a dispersion liquid of carbon nanotubes using the same. The system includes; a mixing device supplied with solvent and carbon nanotubes, and storing a admixture of the solvent and the carbon nanotubes; a first dispersion device connected to the mixing device, performing a primary dispersion of the carbon nanotubes by an operation of a rotor and a stator, and then performing a secondary dispersion to form bent portions in the carbon nanotubes while discharging the carbon nanotubes through penetration holes of the stator; and a second dispersion device performing a tertiary dispersion of the carbon nanotubes to selectively cut the bent portions of the carbon nanotubes by irradiating a laser when the secondarily dispersed admixture recirculates to the mixing device.