CNT Composite Material with Direct Network Adhesion for Conductivity
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Solution Overview
Problem
Current composite materials with high concentrations of carbon nanotubes (CNTs) fail to achieve desired levels of electrical conductivity, heat conductivity, and mechanical strength for practical use due to intermediary agents causing insulation or heat conduction failures, and CNTs tend to aggregate, impairing the original base material functions.
Innovation Solution
A composite material is developed where CNTs are dispersed in a solution without intermediary agents, undergoing a reversible reaction to form a network structure that directly adheres to the base material, allowing for high electrical and heat conductivity and improved mechanical strength even at low CNT concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large amount of dispersant is added to prevent CNT aggregation, then CNT dispersion uniformity is improved, but the base material functions are impaired due to dispersant coating on CNT surfaces
Solution Approach 1:
The invention removes the dispersant from the system entirely. Instead of using a dispersant to prevent aggregation, the patent employs ultrasonic irradiation to directly disperse CNTs in the solvent, eliminating the harmful coating effect while maintaining dispersion uniformity. This extraction of the harmful element (dispersant) resolves the contradiction between dispersion quality and base material functionality.
Solution Approach 2:
The invention replaces the chemical mechanism (dispersant molecules coating CNT surfaces) with a physical mechanism (ultrasonic waves providing mechanical energy for dispersion). This substitution eliminates the need for chemical intermediaries that impair base material functions, while still achieving uniform CNT distribution through cavitation and mechanical breakdown of aggregates.
2Stability of the object's composition
If ultrasonic irradiation is applied to disperse CNTs, then CNT dispersion is improved, but energy consumption increases
Solution Approach 1:
The invention applies ultrasonic irradiation at optimized, moderate levels rather than excessive energy input. By controlling the ultrasonic treatment to provide just sufficient energy for dispersion without over-treatment, the patent achieves effective CNT dispersion while minimizing unnecessary energy consumption. This partial action approach balances dispersion quality with energy efficiency.
3Strength
If dispersant and adhesive are used to allow CNTs to adhere to base material, then adhesion is improved, but insulation or heat conduction failure occurs due to intermediary agents
Solution Approach 1:
The invention removes the intermediary agents (dispersants and adhesives) from the system. By using ultrasonic irradiation to directly enable CNT adhesion to the base material without chemical intermediaries, the patent eliminates the insulation or heat conduction barriers that these agents create, while still achieving sufficient adhesion for practical applications.
Solution Approach 2:
The invention uses the solvent itself as a benign intermediary that does not impede conduction. Instead of using specialized dispersants or adhesives that create insulating layers, the patent allows CNTs to interact directly with the base material through the solvent medium, which does not interfere with electrical or thermal conduction pathways.
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 composite material exhibits enhanced electrical and heat conductivity, and improved mechanical strength without the use of intermediary agents, ensuring CNTs remain adhered to the surface and maintain the original base material functions, surpassing the performance of conventional composite materials.
Implementation Method 1
since such CNTs irreversibly aggregate in the CNT nano-dispersion due to the van der Waals force
Data Source
AI summary
Provided are: a composite material capable of exhibiting the original functions of a base material thereof and also capable of exhibiting functions derived from CNTs, such as electrical conductivity, heat conductivity, and mechanical strength; and a molded article therefrom. A composite material comprising a base material and a structure formed on the surface of the base material, the structure including a plurality of carbon nanotubes, wherein the plurality of carbon nanotubes form a network structure, in which the carbon nanotubes are directly connected with one another and also directly adhere to the surface of the base material.