Carbon Nanotube Dispersion Structure for Low-Loading Conductivity
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Solution Overview
Problem
Existing carbon nanotube dispersions, particularly those with single-walled carbon nanotubes, face challenges in achieving high electrical conductivity due to dispersibility and cost issues, limiting the formation of conductive paths even with a small amount of carbon nanotubes.
Innovation Solution
A carbon nanotube dispersion comprising carbon nanotubes, a dispersant, and a binder component forms accumulations that are connected to each other, utilizing surfactants and binder resins to enhance dispersibility and connectivity, thereby achieving high electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of carbon nanotube is increased to form electrically conductive paths, then electrical conductivity is improved, but dispersibility deteriorates and cost increases
Solution Approach 1:
The patent uses a composite dispersant system combining a primary dispersant (surfactant) and a secondary dispersant (polymer) to achieve effective carbon nanotube dispersion at low concentrations. This composite approach allows forming conductive paths with minimal carbon nanotube content by optimizing the dispersion quality through synergistic interaction between different dispersant mechanisms.
Solution Approach 2:
The patent optimizes multiple parameters including dispersant concentration ratio (primary to secondary dispersant), carbon nanotube concentration, pH value, and ionic strength to achieve maximum electrical conductivity at minimal carbon nanotube content. By systematically adjusting these parameters, the invention finds the optimal balance point where conductive paths form efficiently with small amounts of carbon nanotubes.
2Reliability
If the amount of carbon nanotube is increased to form electrically conductive paths, then electrical conductivity is improved, but dispersibility deteriorates
Solution Approach 1:
The invention employs a composite dispersant system where a primary dispersant (ionic or nonionic surfactant) provides initial stabilization of carbon nanotubes, and a secondary dispersant (polymer with specific molecular weight) enhances steric stabilization and prevents aggregation. This dual-dispersant approach maintains excellent dispersibility even when carbon nanotube content is optimized for conductivity, resolving the contradiction between conductivity enhancement and dispersibility maintenance.
Solution Approach 2:
The patent introduces polymer-type dispersants as intermediary substances that mediate between carbon nanotubes and the surrounding medium. These polymers adsorb onto carbon nanotube surfaces and provide steric barriers that prevent aggregation, allowing higher carbon nanotube concentrations to be dispersed uniformly without sacrificing dispersibility, thereby enabling conductive path formation while maintaining stable dispersion.
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 dispersion achieves high electrical conductivity with a small amount of carbon nanotubes, forming conductive paths through connected accumulations, demonstrating improved conductivity across various applications.
Implementation Method 1
a dispersant, which causes accumulations obtained by accumulating a plurality of carbon nanotubes to be connected to one another
Implementation Method 2
a binder component... a structure is formed in which accumulations obtained by accumulating a plurality of carbon nanotubes are connected to each other
Data Source
AI summary
This invention provides a carbon nanotube dispersion capable of achieving high electrical conductivity even with a small amount of carbon nanotube, and an electrically conductive material using the same. A carbon nanotube dispersion of the present invention contains a carbon nanotube, a dispersant, and a binder component. The carbon nanotube is preferably a single-walled carbon nanotube. The binder component is preferably an acrylic resin. An electrically conductive material of the present invention contains a carbon nanotube dispersion described above.