Carbon Nanotube Functionalization via Nitro Compound Oxidation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for functionalizing carbon nanotubes using strong acids or bases are environmentally harmful, costly, and inefficient, with long reaction times and low throughput, and do not effectively improve dispersibility in media.
Innovation Solution
A continuous method and apparatus for functionalizing carbon nanotubes under subcritical water conditions using a nitro compound oxidizer, such as nitromethane, to form nitric acid, which improves dispersibility without the need for strong acids or bases, involving a mixing and feeding part, preheater, functionalizing reactor, quenching and pH adjusting part, and cooling and depressurizing system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strong acids or bases are used for functionalizing carbon nanotubes, then functional groups are introduced on the surface, but environmental harm increases and reactor corrosion occurs
Solution Approach 1:
The patent changes the chemical parameters by using nitro compounds (e.g., nitromethane, nitroethane) instead of traditional strong acids or bases. This parameter substitution maintains the functionalization capability while eliminating the harmful environmental and corrosive effects associated with conventional reagents.
Solution Approach 2:
The nitro compounds used in this patent are more environmentally benign and can be easily disposed of or degraded compared to strong acids and bases. The reaction byproducts are less harmful, reducing the need for complex waste treatment processes and protecting the reactor from corrosion.
2Manufacturing precision
If strong acids or bases are used for functionalizing carbon nanotubes, then functional groups are introduced, but reaction time increases and throughput decreases
Solution Approach 1:
The nitro compounds serve as effective oxidizing agents that can rapidly functionalize carbon nanotubes. The oxidation mechanism facilitated by nitro compounds proceeds faster than traditional strong acid or base treatments, thereby reducing reaction time and increasing throughput while maintaining functional group introduction efficiency.
3Manufacturing precision
If traditional functionalization methods are used, then functional groups are introduced, but additional washing processes are required and harmful wastes are generated
Solution Approach 1:
The patent converts the potential harm of using reactive chemical compounds into a benefit by selecting nitro compounds that decompose into benign products. The reaction byproducts are less harmful and easier to manage, eliminating the need for extensive washing processes and reducing waste treatment complexity.
4Stability of the object's composition
If carbon nanotubes are used without functionalization, then inherent properties are maintained, but dispersibility in media is poor
Solution Approach 1:
The patent applies local quality modification by introducing functional groups specifically at the surface of carbon nanotubes while preserving the bulk inherent properties. The functionalization is localized to the surface region, maintaining the excellent mechanical and electrical properties of CNTs while improving their dispersibility and compatibility with various media.
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 method enhances the dispersibility of carbon nanotubes in water and organic solvents, reduces environmental harm, and shortens the process, making it more efficient and cost-effective by using subcritical water conditions to oxidize the carbon nanotube surface with nitric acid generated from a nitro compound and oxidizer.
Implementation Method 1
using a nitro compound oxidizer so as to improve dispersibility... treating a carbon nanotube solution including nitro compound... under subcritical conditions... to form nitric acid... oxidize the carbon nanotube surface
Data Source
AI summary
The present invention relates to a continuous method and apparatus for functionalizing a carbon nanotube, and more specifically, to a continuous method and apparatus for functionalizing a carbon nanotube including preparing a functionalized product by functionalizing a carbon nanotube solution including nitro compound according to the following Chemical Formula 1 and carbon nanotube mixture including an oxidizer for forming nitric acid under subcritical water or supercritical water condition of 50 to 400 atm and a continuous method and apparatus for functionalizing a carbon nanotube under subcritical water or supercritical water condition using nitro compound without using strong acids or strong bases. [Chemical Formula 1] R-(NOx)y wherein Chemical Formula 1, R is alkyl group of C1 to C7 or aryl group of C6 to C20 and x and y are integers_of 1 to 3 independently.